II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000366
Group -
The operating system must prevent the installation of patches, service packs, device drivers, or operating system components without verification they have been digitally signed using a certificate that is recognized and approved by the organization.
Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has bee...Rule High Severity -
SRG-OS-000368
Group -
The operating system must prevent program execution in accordance with local policies regarding software program usage and restrictions and/or rules authorizing the terms and conditions of software program usage.
Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may provide a capability that runs counter to the mission or provides users wi...Rule Medium Severity -
SRG-OS-000370
Group -
The operating system must employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs.
Utilizing a whitelist provides a configuration management method for allowing the execution of only authorized software. Using only authorized software decreases risk by limiting the number of pote...Rule Medium Severity -
SRG-OS-000373
Group -
The operating system must require users to reauthenticate for privilege escalation.
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to escalate a functional capability, ...Rule Medium Severity -
SRG-OS-000373
Group -
The operating system must require users to reauthenticate when changing roles.
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to change security roles, it is criti...Rule Medium Severity -
SRG-OS-000373
Group -
The operating system must require users to reauthenticate when changing authenticators.
Without reauthentication, users may access resources or perform tasks for which they do not have authorization. When operating systems provide the capability to change user authenticators, it is ...Rule Medium Severity -
SRG-OS-000375
Group -
The operating system must implement multifactor authentication for remote access to privileged accounts in such a way that one of the factors is provided by a device separate from the system gaining access.
Using an authentication device, such as a common access card (CAC) or token that is separate from the information system, ensures that even if the information system is compromised, that compromise...Rule Medium Severity -
SRG-OS-000376
Group -
The operating system must accept Personal Identity Verification (PIV) credentials.
The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access. DoD has mandated the use of the CAC to support identity management and personal authentication f...Rule Medium Severity -
SRG-OS-000377
Group -
The operating system must electronically verify Personal Identity Verification (PIV) credentials.
The use of PIV credentials facilitates standardization and reduces the risk of unauthorized access. DoD has mandated the use of the CAC to support identity management and personal authentication f...Rule Medium Severity -
SRG-OS-000378
Group -
The operating system must authenticate peripherals before establishing a connection.
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Peripherals include, but are not limited to, such devices as flash drive...Rule Medium Severity -
SRG-OS-000379
Group -
The operating system must authenticate all endpoint devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.
Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Bidirectional authentication provides stronger safeguards to validate the...Rule Medium Severity -
SRG-OS-000383
Group -
The operating system must prohibit the use of cached authenticators after one day.
If cached authentication information is out-of-date, the validity of the authentication information may be questionable.Rule Medium Severity -
SRG-OS-000384
Group -
The operating system, for PKI-based authentication, must implement a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network.
Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer authorized (users with revoked certificates).Rule Medium Severity -
SRG-OS-000392
Group -
The operating system must audit all activities performed during nonlocal maintenance and diagnostic sessions.
If events associated with nonlocal administrative access or diagnostic sessions are not logged, a major tool for assessing and investigating attacks would not be available. This requirement addres...Rule Medium Severity -
SRG-OS-000393
Group -
The operating system must implement cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.
Privileged access contains control and configuration information and is particularly sensitive, so additional protections are necessary. This is maintained by using cryptographic mechanisms, such a...Rule High Severity -
SRG-OS-000394
Group -
The operating system must implement cryptographic mechanisms to protect the confidentiality of nonlocal maintenance and diagnostic communications, when used for nonlocal maintenance sessions.
Privileged access contains control and configuration information and is particularly sensitive, so additional protections are necessary. This is maintained by using cryptographic mechanisms such as...Rule High Severity -
SRG-OS-000395
Group -
The operating system must verify remote disconnection at the termination of nonlocal maintenance and diagnostic sessions, when used for nonlocal maintenance sessions.
If the remote connection is not closed and verified as closed, the session may remain open and be exploited by an attacker; this is referred to as a zombie session. Remote connections must be disco...Rule Medium Severity -
SRG-OS-000396
Group -
The operating system must implement NSA-approved cryptography to protect classified information in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.
Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The operating system must implement cryptographic modules adhering to the higher stand...Rule High Severity -
SRG-OS-000403
Group -
The operating system must only allow the use of DoD PKI-established certificate authorities for authentication in the establishment of protected sessions to the operating system.
Untrusted Certificate Authorities (CA) can issue certificates, but they may be issued by organizations or individuals that seek to compromise DoD systems or by organizations with insufficient secur...Rule Medium Severity -
SRG-OS-000404
Group -
The operating system must implement cryptographic mechanisms to prevent unauthorized modification of all information at rest on all operating system components.
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 ...Rule High Severity -
SRG-OS-000405
Group -
The operating system must implement cryptographic mechanisms to prevent unauthorized disclosure of all information at rest on all operating system components.
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 ...Rule High Severity -
SRG-OS-000420
Group -
The operating system must protect against or limit the effects of Denial of Service (DoS) attacks by ensuring the operating system is implementing rate-limiting measures on impacted network interfaces.
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. This require...Rule Medium Severity -
SRG-OS-000423
Group -
The operating system must protect the confidentiality and integrity of transmitted information.
Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. This requirem...Rule High Severity -
SRG-OS-000424
Group -
The operating system must implement cryptographic mechanisms to prevent unauthorized disclosure of information and/or detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a Protected Distribution System (PDS).
Encrypting information for transmission protects information from unauthorized disclosure and modification. Cryptographic mechanisms implemented to protect information integrity include, for exampl...Rule High Severity -
SRG-OS-000425
Group -
The operating system must maintain the confidentiality and integrity of information during preparation for transmission.
Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, for example, during aggregation, at protocol transformation points, and during pa...Rule Medium Severity
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