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XCCDF
IBM zVM Using CA VM:Secure Security Technical Implementation Guide
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77 rules organized in 77 groups
SRG-OS-000001-GPOS-00001
1 Rule
The IBM z/VM TCP/IP DTCPARMS files must be properly configured to connect to an external security manager.
High Severity
A comprehensive account management process such as provided by External Security Managers (ESM) which includes automation helps to ensure accounts designated as requiring attention are consistently and promptly addressed. Examples include, but are not limited to, using automation to take action on multiple accounts designated as inactive, suspended, or terminated, or by disabling accounts located in non-centralized account stores such as multiple servers. This requirement applies to all account types, including individual/user, shared, group, system, guest/anonymous, emergency, developer/manufacturer/vendor, temporary, and service. DTCPARMS setting assures that an ESM is enabled. Account management functions include: assigning group or role membership; identifying account type; specifying user access authorizations (i.e., privileges); account removal, update, or termination; and administrative alerts.
SRG-OS-000004-GPOS-00004
1 Rule
CA VM:Secure product must be installed and operating.
Medium Severity
A comprehensive account management process such as provided by an External Security Manager (ESM) which includes automation helps to ensure accounts designated as requiring attention are consistently and promptly addressed. Account management functions include: assigning group or role membership; identifying account type; specifying user access authorizations (i.e., privileges); account removal, update, or termination; and administrative alerts. Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing access. One way to accomplish this is for the attacker to create an account. Auditing account creation actions provides logging that can be used for forensic purposes. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000032-GPOS-00013, SRG-OS-000037-GPOS-00015, SRG-OS-000038-GPOS-00016, SRG-OS-000039-GPOS-00017, SRG-OS-000040-GPOS-00018, SRG-OS-000041-GPOS-00019, SRG-OS-000042-GPOS-00020, SRG-OS-000042-GPOS-00021, SRG-OS-000062-GPOS-00031, SRG-OS-000255-GPOS-00096, SRG-OS-000365-GPOS-00152, SRG-OS-000327-GPOS-00127, SRG-OS-000462-GPOS-00206, SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000463-GPOS-00207, SRG-OS-000303-GPOS-00120, SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00211, SRG-OS-000468-GPOS-00212, SRG-OS-000471-GPOS-00215, SRG-OS-000471-GPOS-00216, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000474-GPOS-00219, SRG-OS-000475-GPOS-00220, SRG-OS-000476-GPOS-00221, SRG-OS-000477-GPOS-00222, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000392-GPOS-00172, SRG-OS-000239-GPOS-00089, SRG-OS-000465-GPOS-00209
SRG-OS-000021-GPOS-00005
1 Rule
The IBM z/VM JOURNALING LOGON parameter must be set for lockout after 3 attempts for 15 minutes.
Medium Severity
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.
SRG-OS-000021-GPOS-00005
1 Rule
The CA VM:Secure JOURNAL Facility parameters must be set for lockout after 3 attempts.
Medium Severity
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.
SRG-OS-000023-GPOS-00006
1 Rule
The IBM z/VM LOGO Configuration file must be configured to display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system.
Medium Severity
Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner: "I've read & consent to terms in IS user agreem't."
SRG-OS-000023-GPOS-00006
1 Rule
The IBM z/VM TCP/IP FTP Server must be configured to display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system and until users acknowledge the usage conditions and take explicit actions to log on for further access.
Medium Severity
The banner must be acknowledged by the user prior to allowing the user access to the operating system. This provides assurance that the user has seen the message and accepted the conditions for access. If the consent banner is not acknowledged by the user, DoD will not be in compliance with system use notifications required by law. To establish acceptance of the application usage policy, a click-through banner at system logon is required. The system must prevent further activity until the user executes a positive action to manifest agreement by clicking on a box indicating "OK". Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007
SRG-OS-000024-GPOS-00007
1 Rule
The IBM z/VM LOGO configuration file must be configured to display the Standard Mandatory DoD Notice and Consent Banner until users acknowledge the usage conditions and take explicit actions to log on for further access.
Medium Severity
The banner must be acknowledged by the user prior to allowing the user access to the operating system. This provides assurance that the user has seen the message and accepted the conditions for access. If the consent banner is not acknowledged by the user, DoD will not be in compliance with system use notifications required by law.
SRG-OS-000032-GPOS-00013
1 Rule
For FTP processing Z/VM TCP/IP FTP server Exit must be enabled.
Medium Severity
Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access management difficult at best. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.
SRG-OS-000033-GPOS-00014
1 Rule
The IBM z/VM TCP/IP configuration must include an SSLSERVERID statement.
Medium Severity
The Secure Socket Layer (SSL) server, provides processing support for secure (encrypted) communication between remote clients and z/VM TCP/IP application servers that are configured for secure communications The TCP/IP (stack) server routes requests for secure connections to an SSL server, which interacts with a client on behalf of an application server to perform handshake operations and the exchange of cryptographic parameters for a secure session. The SSL server then manages the encryption and decryption of data for an established, secure session. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information. Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093, SRG-OS-000424-GPOS-00188, SRG-OS-000426-GPOS-00190, SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174, SRG-OS-000423-GPOS-00187
SRG-OS-000057-GPOS-00027
1 Rule
CA VM:Secure product AUDIT file must be restricted to authorized personnel.
Medium Severity
Unauthorized disclosure of audit records can reveal system and configuration data to attackers, thus compromising its confidentiality. Audit information includes all information (e.g., audit records, audit settings, audit reports) needed to successfully audit operating system activity. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029
SRG-OS-000470-GPOS-00214
1 Rule
The IBM z/VM Journal option must be specified in the Product Configuration File.
Medium Severity
Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). The JOURNALING statement tells z/VM CP to include the journaling facility and to enable the system being initialized to set and query the journaling facility.
SRG-OS-000066-GPOS-00034
1 Rule
All digital certificates in use must have a valid path to a trusted Certification authority.
Medium Severity
Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate not already explicitly trusted. A trust anchor is an authoritative entity represented via a public key and associated data. It is used in the context of public key infrastructures, X.509 digital certificates, and DNSSEC. When there is a chain of trust, usually the top entity to be trusted becomes the trust anchor; it can be, for example, a Certification Authority (CA). A certification path starts with the subject certificate and proceeds through a number of intermediate certificates up to a trusted root certificate, typically issued by a trusted CA. This requirement verifies that a certification path to an accepted trust anchor is used for certificate validation and that the path includes status information. Path validation is necessary for a relying party to make an informed trust decision when presented with any certificate not already explicitly trusted. Status information for certification paths includes certificate revocation lists or online certificate status protocol responses. Validation of the certificate status information is out of scope for this requirement.
SRG-OS-000067-GPOS-00035
1 Rule
The IBM z/VM TCP/IP Key database for LDAP or SSL server must be created with the proper permissions.
Medium Severity
If the private key is discovered, an attacker can use the key to authenticate as an authorized user and gain access to the network infrastructure. The cornerstone of the PKI is the private key used to encrypt or digitally sign information. If the private key is stolen, this will lead to the compromise of the authentication and non-repudiation gained through PKI because the attacker can use the private key to digitally sign documents and pretend to be the authorized user. Both the holders of a digital certificate and the issuing authority must protect the computers, storage devices, or whatever they use to keep the private keys.
SRG-OS-000073-GPOS-00041
1 Rule
CA VM:Secure product Password Encryption (PEF) option must be properly configured to store and transmit cryptographically-protected passwords.
High Severity
Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Satisfies: SRG-OS-000073-GPOS-00041, SRG-OS-000074-GPOS-00042
SRG-OS-000076-GPOS-00044
1 Rule
CA VM:Secure product AUTOEXP record in the Security Config File must be properly set.
Medium Severity
Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.
SRG-OS-000077-GPOS-00045
1 Rule
CA VM:Secure product PASSWORD user exit must be coded with the PWLIST option properly set.
Medium Severity
Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.
SRG-OS-000078-GPOS-00046
1 Rule
IBM zVM CA VM:Secure product PASSWORD user exit must be in use.
Medium Severity
The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. Use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password. Satisfies: SRG-OS-000078-GPOS-00046, SRG-OS-000480-GPOS-00227, SRG-OS-000480-GPOS-00227, SRG-OS-000266-GPOS-00101, SRG-OS-000075-GPOS-00043, SRG-OS-000070-GPOS-00038, SRG-OS-000071-GPOS-00039, SRG-OS-000069-GPOS-00037, SRG-OS-000072-GPOS-00040
SRG-OS-000095-GPOS-00049
1 Rule
IBM z/VM must be configured to disable non-essential capabilities.
Medium Severity
It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of non-essential capabilities include, but are not limited to, games, software packages, tools, and demonstration software, not related to requirements or providing a wide array of functionality not required for every mission, but which cannot be disabled.
SRG-OS-000480-GPOS-00226
1 Rule
CA VM:Secure product Config Delay LOG option must be set to 0.
Medium Severity
IBM z/VM 6.4.0 made changes to obscure whether a logon is invalid due to the user ID or due to the password. Both the logon prompting sequence and the message HCPLGA050E were changed. However, DELAYLOG causes a delay for a logon with an invalid password that it does not cause when the user ID is invalid. Thus, if you are using DELAYLOG with z/VM 6.4.0, you can inadvertently let someone trying to break into your system know that it is the password that is invalid.
SRG-OS-000080-GPOS-00048
1 Rule
CA VM:Secure product NORULE record in the SECURITY CONFIG file must be configured to REJECT.
Medium Severity
To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must be properly configured to incorporate access control methods that do not rely solely on the possession of a certificate for access. Successful authentication must not automatically give an entity access to an asset or security boundary. Authorization procedures and controls must be implemented to ensure each authenticated entity also has a validated and current authorization. Authorization is the process of determining whether an entity, once authenticated, is permitted to access a specific asset. Information systems use access control policies and enforcement mechanisms to implement this requirement. Access control policies include: identity-based policies, role-based policies, and attribute-based policies. Access enforcement mechanisms include: access control lists, access control matrices, and cryptography. These policies and mechanisms must be employed by the application to control access between users (or processes acting on behalf of users) and objects (e.g., devices, files, records, processes, programs, and domains) in the information system. Satisfies: SRG-OS-000080-GPOS-00048, SRG-OS-000480-GPOS-00228, SRG-OS-000480-GPOS-00229, SRG-OS-000104-GPOS-00051, SRG-OS-000121-GPOS-00062, SRG-OS-000370-GPOS-00155
SRG-OS-000096-GPOS-00050
1 Rule
All IBM z/VM TCP/IP Ports must be restricted to ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments.
Medium Severity
In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems. Operating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues.
SRG-OS-000118-GPOS-00060
1 Rule
The IBM z/VM Security Manager must provide a procedure to disable userIDs after 35 days of inactivity.
Medium Severity
Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained. Operating systems need to track periods of inactivity and disable application identifiers after 35 days of inactivity.
SRG-OS-000120-GPOS-00061
1 Rule
The IBM z/VM TCP/IP VMSSL command operands must be configured properly.
High Severity
VMSSL services are initiated using the VMSSL command defined in the DTCPARMS file. Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised.
SRG-OS-000121-GPOS-00062
1 Rule
The IBM z/VM TCP/IP ANONYMOU statement must not be coded in FTP configuration.
Medium Severity
Operating systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules.
SRG-OS-000132-GPOS-00067
1 Rule
CA VM:Secure product ADMIN GLOBALS command must be restricted to systems programming personnel.
Medium Severity
Operating system management functionality includes functions necessary for administration and requires privileged user access. Allowing non-privileged users to access operating system management functionality capabilities increases the risk that non-privileged users may obtain elevated privileges. Operating system management functionality includes functions necessary to administer console, network components, workstations, or servers and typically requires privileged user access. The separation of user functionality from information system management functionality is either physical or logical and is accomplished by using different computers, different central processing units, different instances of the operating system, different network addresses, different TCP/UDP ports, virtualization techniques, combinations of these methods, or other methods, as appropriate. An example of this type of separation is observed in web administrative interfaces that use separate authentication methods for users of any other information system resources. This may include isolating the administrative interface on a different security domain and with additional access controls.
SRG-OS-000134-GPOS-00068
1 Rule
CA VM:Secure must have a security group for Security Administrators only.
Medium Severity
An isolation boundary provides access control and protects the integrity of the hardware, software, and firmware that perform security functions. Security functions are the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Operating systems implement code separation (i.e., separation of security functions from non-security functions) in a number of ways, including through the provision of security kernels via processor rings or processor modes. For non-kernel code, security function isolation is often achieved through file system protections that serve to protect the code on disk and address space protections that protect executing code. Developers and implementers can increase the assurance in security functions by employing well-defined security policy models; structured, disciplined, and rigorous hardware and software development techniques; and sound system/security engineering principles. Implementation may include isolation of memory space and libraries. Operating systems restrict access to security functions through the use of access control mechanisms and by implementing least privilege capabilities.
SRG-OS-000138-GPOS-00069
1 Rule
The IBM z/VM SYSTEM CONFIG file must be configured to clear TDISK on IPL.
Medium Severity
Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of processes acting on behalf of prior users/roles) from being available to any current users/roles (or current processes) that obtain access to shared system resources (e.g., registers, main memory, hard disks) after those resources have been released back to information systems. The control of information in shared resources is also commonly referred to as object reuse and residual information protection. This requirement generally applies to the design of an information technology product, but it can also apply to the configuration of particular information system components that are, or use, such products. This can be verified by acceptance/validation processes in DoD or other government agencies. There may be shared resources with configurable protections (e.g., files in storage) that may be assessed on specific information system components.
SRG-OS-000142-GPOS-00071
1 Rule
The IBM z/VM TCP/IP FOREIGNIPCONLIMIT statement must be properly configured.
Medium Severity
DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning. Use the FOREIGNIPCONLIMIT statement to define the maximum number of connections that a foreign IP address is allowed to have open at the same time. If this value would be exceeded, an SSTRESS denial-of-service attack is declared.
SRG-OS-000142-GPOS-00071
1 Rule
The IBM z/VM TCP/IP PERSISTCONNECTIONLIMIT statement must be properly configured.
Medium Severity
DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning. The PERSISTCONNECTIONLIMIT statement defines the maximum number of connections in TCP persist state at any given time. When a new connection in persist state causes this limit to be exceeded, the oldest current connection in persist state is dropped and a ZeroWin denial-of-service attack is declared.
SRG-OS-000142-GPOS-00071
1 Rule
The IBM z/VM TCP/IP PENDINGCONNECTIONLIMIT statement must be properly configured.
Medium Severity
DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning. The PENDINGCONNECTIONLIMIT statement defines the maximum number of half-open connections that are allowed at any given time. When a new half-open connection causes this limit to be exceeded, a random current half-open connection is dropped and a SynFlood denial-of-service attack is declared.
SRG-OS-000185-GPOS-00079
1 Rule
IBM z/VM tapes must use Tape Encryption.
Medium Severity
Information at rest refers to the state of information when it is located on a secondary storage device (e.g., disk drive and tape drive, when used for backups) within an operating system. Guest operating systems, such as CMS, that are not capable of enabling the hardware encryption available with the 3592 Model E05 tape drive are able to use z/VM facilities that enable the encryption on behalf of the guest. Guest operating systems that do support tape encryption, such as z/OS with proper service, will be able to do so without interference from z/VM.
SRG-OS-000228-GPOS-00088
1 Rule
The IBM z/VM TCP/IP must be configured to display the mandatory DoD Notice and Consent banner before granting access to the system.
Medium Severity
Display of a standardized and approved use notification before granting access to the publicly accessible operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance. System use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist. The banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters: "You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details." Use the following verbiage for operating systems that have severe limitations on the number of characters that can be displayed in the banner: "I've read & consent to terms in IS user agreem't."
SRG-OS-000254-GPOS-00095
1 Rule
The IBM z/VM JOURNALING statement must be coded on the configuration file.
Medium Severity
If auditing is enabled late in the start-up process, the actions of some start-up processes may not be audited. Some audit systems also maintain state information only available if auditing is enabled before a given process is created.
SRG-OS-000256-GPOS-00097
1 Rule
CA VM:Secure product SECURITY CONFIG file must be restricted to appropriate personnel.
Medium Severity
Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information. Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user enjoys in order to make access decisions regarding the access to audit tools. Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators. Satisfies: SRG-OS-000256-GPOS-00097, SRG-OS-000480-GPOS-00227
SRG-OS-000257-GPOS-00098
1 Rule
The IBM z/VM AUDT and Journal Mini Disks must be restricted to the appropriate system administrators.
Medium Severity
Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information. Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user has in order to make access decisions regarding the modification of audit tools. Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators. Satisfies: SRG-OS-000257-GPOS-00098, SRG-OS-000258-GPOS-00099
SRG-OS-000123-GPOS-00064
1 Rule
IBM z/VM must remove or disable emergency accounts after the crisis is resolved or 72 hours.
Medium Severity
Emergency accounts are privileged accounts that are established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability. Emergency accounts are different from infrequently used accounts (i.e., local logon accounts used by the organization's system administrators when network or normal logon/access is not available). Infrequently used accounts are not subject to automatic termination dates. Emergency accounts are accounts created in response to crisis situations, usually for use by maintenance personnel. The automatic expiration or disabling time period may be extended as needed until the crisis is resolved; however, it must not be extended indefinitely. A permanent account should be established for privileged users who need long-term maintenance accounts. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.
SRG-OS-000259-GPOS-00100
1 Rule
The IBM z/VM must restrict link access to the disk on which system software resides.
Medium Severity
If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.
SRG-OS-000362-GPOS-00149
1 Rule
The IBM z/VM Privilege command class A and Class B must be properly assigned.
Medium Severity
Allowing regular users to install software, without explicit privileges, creates the risk that untested or potentially malicious software will be installed on the system. Explicit privileges (escalated or administrative privileges) provide the regular user with explicit capabilities and control that exceeds the rights of a regular user. Operating system functionality will vary, and while users are not permitted to install unapproved software, there may be instances where the organization allows the user to install approved software packages, such as from an approved software repository. The operating system or software configuration management utility must enforce control of software installation by users based upon what types of software installations are permitted (e.g., updates and security patches to existing software) and what types of installations are prohibited (e.g., software whose pedigree with regard to being potentially malicious is unknown or suspect) by the organization.
SRG-OS-000364-GPOS-00151
1 Rule
CA VM:Secure AUTHORIZ CONFIG file must be properly configured.
Medium Severity
Failure to provide logical access restrictions associated with changes to system configuration may have significant effects on the overall security of the system. When dealing with access restrictions pertaining to change control, it should be noted that any changes to the hardware, software, and/or firmware components of the operating system can have significant effects on the overall security of the system. Accordingly, only qualified and authorized individuals should be allowed to obtain access to operating system components for the purposes of initiating changes, including upgrades and modifications. Logical access restrictions include, for example, controls that restrict access to workflow automation, media libraries, abstract layers (e.g., changes implemented into third-party interfaces rather than directly into information systems), and change windows (e.g., changes occur only during specified times, making unauthorized changes easy to discover).
SRG-OS-000341-GPOS-00132
1 Rule
The IBM z/VM journal minidisk space allocation must be large enough for one weeks worth of audit records.
Medium Severity
In order to ensure operating systems have a sufficient storage capacity in which to write the audit logs, operating systems need to be able to allocate audit record storage capacity. The task of allocating audit record storage capacity is usually performed during initial installation of the operating system.
SRG-OS-000342-GPOS-00133
1 Rule
CA VM:Secure product audit records must offload audit records to a different system or media.
Medium Severity
Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.
SRG-OS-000479-GPOS-00224
1 Rule
CA VM:Secure product audit records must be offloaded on a weekly basis.
Medium Severity
Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common process in information systems with limited audit storage capacity.
SRG-OS-000379-GPOS-00164
1 Rule
The IBM z/VM Portmapper server virtual machine userID must be included in the AUTOLOG statement of the TCP/IP server configuration file.
Medium Severity
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Bidirectional authentication provides stronger safeguards to validate the identity of other devices for connections that are of greater risk. Bidirectional authentication solutions include, but are not limited to, IEEE 802.1x and Extensible Authentication Protocol [EAP], RADIUS server with EAP-Transport Layer Security [TLS] authentication, Kerberos, and SSL mutual authentication. A local connection is any connection with a device communicating without the use of a network. A network connection is any connection with a device that communicates through a network (e.g., local area network, wide area network, or the Internet). A remote connection is any connection with a device communicating through an external network (e.g., the Internet). Because of the challenges of applying this requirement on a large scale, organizations are encouraged to only apply this requirement to those limited number (and type) of devices that truly need to support this capability.
SRG-OS-000312-GPOS-00124
1 Rule
CA VM:Secure product MANAGE command must be restricted to system administrators.
Medium Severity
Discretionary Access Control (DAC) is based on the notion that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in which mode (e.g., read or write). Ownership is usually acquired as a consequence of creating the object or via specified ownership assignment. DAC allows the owner to determine who will have access to objects they control. An example of DAC includes user-controlled file permissions. When discretionary access control policies are implemented, subjects are not constrained with regard to what actions they can take with information for which they have already been granted access. Thus, subjects that have been granted access to information are not prevented from passing (i.e., the subjects have the discretion to pass) the information to other subjects or objects. A subject that is constrained in its operation by Mandatory Access Control policies is still able to operate under the less rigorous constraints of this requirement. Thus, while Mandatory Access Control imposes constraints preventing a subject from passing information to another subject operating at a different sensitivity level, this requirement permits the subject to pass the information to any subject at the same sensitivity level. The policy is bounded by the information system boundary. Once the information is passed outside the control of the information system, additional means may be required to ensure the constraints remain in effect. While the older, more traditional definitions of discretionary access control require identity-based access control, that limitation is not required for this use of discretionary access control.
SRG-OS-000326-GPOS-00126
1 Rule
The CA VM:Secure LOGONBY command must be restricted to system administrators.
Medium Severity
In certain situations, software applications/programs need to execute with elevated privileges to perform required functions. However, if the privileges required for execution are at a higher level than the privileges assigned to organizational users invoking such applications/programs, those users are indirectly provided with greater privileges than assigned by the organizations. The LOGONBY statement designates up to eight user IDs that can use their own passwords to log on to and use the virtual machine.
SRG-OS-000324-GPOS-00125
1 Rule
The IBM z/VM CP Privilege Class A, B, and D must be restricted to appropriate system operators.
Medium Severity
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.
SRG-OS-000329-GPOS-00128
1 Rule
The IBM z/VM JOURNALING statement must be properly configured.
Medium Severity
By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.
SRG-OS-000425-GPOS-00189
1 Rule
The IBM z/VM TCP/IP SECUREDATA option for FTP must be set to REQUIRED.
Medium Severity
Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information. Ensuring the confidentiality of transmitted information requires the operating system to take measures in preparing information for transmission. This can be accomplished via access control and encryption. Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When transmitting data, operating systems need to support transmission protection mechanisms such as TLS, SSL VPNs, or IPsec. The SECUREDATA statement specifies the FTP server-wide minimum security level for data connections. Satisfies: SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190
SRG-OS-000297-GPOS-00115
1 Rule
IBM z/VM TCP/IP config file INTERNALCLIENTPARMS statement must be properly configured.
Medium Severity
Remote access services, such as those providing remote access to network devices and information systems, which lack automated control capabilities, increase risk and make remote user access management difficult at best. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Operating system functionality (e.g., RDP) must be capable of taking enforcement action if the audit reveals unauthorized activity. Automated control of remote access sessions allows organizations to ensure ongoing compliance with remote access policies by enforcing connection rules of remote access applications on a variety of information system components (e.g., servers, workstations, notebook computers, smartphones, and tablets). The INTERNALCLIENTPARMS statement is used to configure the Telnet server, an internal client of the TCPIP virtual machine.
SRG-OS-000425-GPOS-00189
1 Rule
All IBM z/VM TCP/IP servers must be configured for SSL/TLS connection.
Medium Severity
Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information. Ensuring the confidentiality of transmitted information requires the operating system to take measures in preparing information for transmission. This can be accomplished via access control and encryption. Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When transmitting data, operating systems need to support transmission protection mechanisms such as TLS, SSL VPNs, or IPsec.
SRG-OS-000426-GPOS-00190
1 Rule
The IBM z/VM TCP/IP SECURETELNETCLIENT option for telnet must be set to YES.
Medium Severity
Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information. Ensuring the confidentiality of transmitted information requires the operating system to take measures in preparing information for transmission. This can be accomplished via access control and encryption. Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When transmitting data, operating systems need to support transmission protection mechanisms such as TLS, SSL VPNs, or IPsec. The SECUREDATA statement specifies the FTP server-wide minimum security level for data connections.
SRG-OS-000324-GPOS-00125
1 Rule
The IBM z/VM Privilege Classes C and E must be restricted to appropriate system administrators.
Medium Severity
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.
SRG-OS-000324-GPOS-00125
1 Rule
The IBM z/VM Privilege Class F must be restricted to service representatives and system administrators only.
Medium Severity
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users. Privilege Class F can obtain, and examine in detail, data about input and output devices connected to the z/VM system. This privilege class is reserved for IBM use only.
SRG-OS-000324-GPOS-00125
1 Rule
The IBM z/VM ANY Privilege Class must not be listed for privilege commands.
Medium Severity
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.
SRG-OS-000480-GPOS-00227
1 Rule
CA VM:Secure product VMXRPI configuration file must be restricted to authorized personnel.
Medium Severity
Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections. The VMXRPI CONFIG file contains records that determine the activity that can occur when the Rules Facility is not available, and provides the configuration information for the Rules Facility.
SRG-OS-000480-GPOS-00227
1 Rule
CA VM:Secure product DASD CONFIG file must be restricted to appropriate personnel.
Medium Severity
Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements.
SRG-OS-000480-GPOS-00227
1 Rule
CA VM:Secure product AUTHORIZ CONFIG file must be restricted to appropriate personnel.
Medium Severity
Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections. The AUTHORIZ CONFIG file is used to tailor user authorizations for CA VM:Secure commands.
SRG-OS-000480-GPOS-00227
1 Rule
CA VM:Secure product CONFIG file must be restricted to appropriate personnel.
Medium Severity
Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections.
SRG-OS-000480-GPOS-00227
1 Rule
CA VM:Secure Product SFS configuration file must be restricted to appropriate personnel.
Medium Severity
Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections. The SFS Configuration file is used to control the addition/deletion of file pools and user storage groups.
SRG-OS-000480-GPOS-00227
1 Rule
CA VM:Secure product Rules Facility must be restricted to appropriate personnel.
Medium Severity
Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections.
SRG-OS-000480-GPOS-00227
1 Rule
IBM z/VM must employ a Session manager.
Medium Severity
A session manager controls the semi-permanent interactive information interchange, also known as a dialogue, between a user and z/VM. Without the use of a session manager these semi-permanent interchanges can be open to compromise and attacks.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM System administrator must develop a notification routine for account management.
Medium Severity
Information system accounts are utilized for identifying individual users or for identifying the operating system processes themselves. In order to detect and respond to events affecting user accessibility and system processing, operating systems must not only audit vital account actions but, as required, notify the appropriate individuals so they can investigate the event. Such a capability greatly reduces the risk that operating system accessibility will be negatively affected for extended periods of time and provides logging that can be used for forensic purposes.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM system administrator must develop routines and processes for the proper configuration and maintenance of Software.
Medium Severity
Proper configuration management procedures for information systems provide for the proper configuration and maintenance in accordance with local policies restrictions and/or rules. Failure to properly configure and maintain system software and applications on the information system could result in a weakened security posture.
SRG-OS-000480-GPOS-00227
1 Rule
IBM z/VM must be protected by an external firewall that has a deny-all, allow-by-exception policy.
Medium Severity
Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Firewalls provide monitoring and control of communications at the external boundary of an information system to prevent and detect malicious and other unauthorized communications.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM System administrator must develop routines and processes for notification in the event of audit failure.
Medium Severity
Audit processing failures include, for example, software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded. Without proper notification vital audit records may be lost.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM system administrator must develop procedures maintaining information system operation in the event of anomalies.
Medium Severity
If anomalies are not acted upon, security functions may fail to secure the system.
SRG-OS-000480-GPOS-00227
1 Rule
IBM z/VM system administrator must develop procedures to manually control temporary, interactive, and emergency accounts.
Medium Severity
Proper handling of temporary, inactive, and emergency accounts require automatic notification and action rather than at the convenience of the systems administrator. However in the absence of automated process manual procedures must be in place to assure that possible sensitive accounts are not compromised.
SRG-OS-000480-GPOS-00227
1 Rule
IBM z/VM must have access to an audit reduction tool that allows for central data review and analysis.
Medium Severity
Audit reduction is a process that manipulates collected audit information and organizes such information in a summary format that is more meaningful to analysts. Audit reduction and report generation capabilities do not always emanate from the same information system or from the same organizational entities conducting auditing activities. Audit reduction capability can include, for example, modern data mining techniques with advanced data filters to identify anomalous behavior in audit records. Audit records may at times be voluminous. Without a reduction tool crucial information may be overlooked.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM system administrator must develop and perform a procedure to validate the correct operation of security functions.
Medium Severity
Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters. This requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.
SRG-OS-000480-GPOS-00227
1 Rule
IBM z/VM must employ Clock synchronization software.
Medium Severity
Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate. Synchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network. Organizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints).
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM systems requiring data at rest must employ IBMs DS8000 for full disk encryption.
Medium Severity
Operating systems handling data requiring "data at rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest. Selection of a cryptographic mechanism is based on the need to protect the integrity of organizational information. The strength of the mechanism is commensurate with the security category and/or classification of the information. Organizations have the flexibility to either encrypt all information on storage devices (i.e., full disk encryption) or encrypt specific data structures (e.g., files, records, or fields).
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM TCP/IP NSLOOKUP statement for UFT servers must be properly configured.
Medium Severity
If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed, which would result in query failure or DoS. Data origin authentication must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. Information systems that use technologies other than the DNS to map between host/service names and network addresses provide other means to enable clients to verify the authenticity of response data. This is not applicable if DNSSEC is not implemented on the local network.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM TCP/IP DOMAINLOOKUP statement must be properly configured.
Medium Severity
If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed, which would result in query failure or DoS. Data origin authentication must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. Information systems that use technologies other than the DNS to map between host/service names and network addresses provide other means to enable clients to verify the authenticity of response data. This is not applicable if DNSSEC is not implemented on the local network.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM TCP/IP NSINTERADDR statement must be present in the TCPIP DATA configuration.
Medium Severity
If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed, which would result in query failure or DoS. Data origin authentication must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. Information systems that use technologies other than the DNS to map between host/service names and network addresses provide other means to enable clients to verify the authenticity of response data. This is not applicable if DNSSEC is not implemented on the local network.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM CHECKSUM statement must be included in the TCP/IP configuration file.
Medium Severity
If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data integrity verification must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. The CHECKSUM statement is a TCP/IP configuration file statement that instructs the TCPIP virtual machine to reenable TCP checksum testing on incoming messages.
SRG-OS-000480-GPOS-00227
1 Rule
The IBM z/VM DOMAINSEARCH statement in the TCPIP DATA file must be configured with proper domain names for name resolution.
Medium Severity
If data origin authentication and data integrity verification are not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been intercepted without the resolver's knowledge, or resource records could have been removed which would result in query failure or denial of service. Data origin authentication verification must be performed to thwart these types of attacks. Each client of name resolution services either performs this validation on its own or has authenticated channels to trusted validation providers. Information systems that provide name and address resolution services for local clients include, for example, recursive resolving or caching Domain Name System (DNS) servers. DNS client resolvers either perform validation of DNSSEC signatures, or clients use authenticated channels to recursive resolvers that perform such validations. This is not applicable if DNSSEC is not implemented on the local network.
SRG-OS-000001-GPOS-00001
1 Rule
CA VM:Secure product Rules Facility must be installed and operating.
High Severity
Enterprise environments make account management for operating systems challenging and complex. A manual process for account management functions adds the risk of a potential oversight or other errors. IBM z/VM requires an external security manager to assure proper account management. Satisfies: SRG-OS-000001-GPOS-00001, SRG-OS-000080-GPOS-00048