II - Mission Support Classified
Rules and Groups employed by this XCCDF Profile
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SRG-OS-000029-GPOS-00010
<GroupDescription></GroupDescription>Group -
IBM z/OS must employ a session manager to manage session lock after a 15-minute period of inactivity.
<VulnDiscussion>A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the ...Rule Medium Severity -
SRG-OS-000002-GPOS-00002
<GroupDescription></GroupDescription>Group -
IBM z/OS System Administrator must develop a procedure to automatically remove or disable temporary user accounts after 72 hours.
<VulnDiscussion>If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be used to gain...Rule Medium Severity -
SRG-OS-000123-GPOS-00064
<GroupDescription></GroupDescription>Group -
IBM z/OS system administrator must develop a procedure to automatically remove or disable emergency accounts after the crisis is resolved or 72 hours.
<VulnDiscussion>Emergency accounts are privileged accounts that are established in response to crisis situations where the need for rapid acc...Rule Medium Severity -
SRG-OS-000304-GPOS-00121
<GroupDescription></GroupDescription>Group -
IBM z/OS system administrator must develop a procedure to notify system administrators and ISSOs of account enabling actions.
<VulnDiscussion>Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...Rule Medium Severity -
SRG-OS-000126-GPOS-00066
<GroupDescription></GroupDescription>Group -
IBM z/OS system administrator must develop a procedure to terminate all sessions and network connections related to nonlocal maintenance when nonlocal maintenance is completed.
<VulnDiscussion>If a maintenance session or connection remains open after maintenance is completed, it may be hijacked by an attacker and use...Rule Medium Severity -
SRG-OS-000437-GPOS-00194
<GroupDescription></GroupDescription>Group -
IBM z/OS system administrator must develop a procedure to remove all software components after updated versions have been installed.
<VulnDiscussion>Previous versions of software components that are not removed from the information system after updates have been installed m...Rule Medium Severity -
SRG-OS-000447-GPOS-00201
<GroupDescription></GroupDescription>Group -
IBM z/OS system administrator must develop a procedure to shut down the information system, restart the information system, and/or notify the system administrator when anomalies in the operation of any security functions are discovered.
<VulnDiscussion>If anomalies are not acted upon, security functions may fail to secure the system. Security function is defined as the hard...Rule Medium Severity -
SRG-OS-000030-GPOS-00011
<GroupDescription></GroupDescription>Group -
IBM z/OS must employ a session manager configured for users to directly initiate a session lock for all connection types.
<VulnDiscussion>A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the ...Rule Medium Severity -
SRG-OS-000118-GPOS-00060
<GroupDescription></GroupDescription>Group -
ACF2 system administrator must develop a procedure to disable account identifiers (individuals, groups, roles, and devices) after 35 days of inactivity.
<VulnDiscussion>Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potenti...Rule Medium Severity -
SRG-OS-000479-GPOS-00224
<GroupDescription></GroupDescription>Group -
IBM z/OS system administrator must develop a procedure to offload SMF files to a different system or media than the system being audited.
<VulnDiscussion>Information stored in one location is vulnerable to accidental or incidental deletion or alteration. Off-loading is a common...Rule Medium Severity -
SRG-OS-000032-GPOS-00013
<GroupDescription></GroupDescription>Group -
IBM z/OS SMF recording options for the SSH daemon must be configured to write SMF records for all eligible events.
<VulnDiscussion>Remote access services, such as those providing remote access to network devices and information systems, which lack automate...Rule Medium Severity -
SRG-OS-000228-GPOS-00088
<GroupDescription></GroupDescription>Group -
IBM z/OS SSH daemon must be configured with the Department of Defense (DoD) logon banner.
<VulnDiscussion>Display of a standardized and approved use notification before granting access to the publicly accessible operating system en...Rule Medium Severity -
SRG-OS-000096-GPOS-00050
<GroupDescription></GroupDescription>Group -
IBM z/OS SSH daemon must be configured to only use the SSHv2 protocol.
<VulnDiscussion>In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....Rule High Severity -
SRG-OS-000033-GPOS-00014
<GroupDescription></GroupDescription>Group -
IBM z/OS SSH daemon must be configured to use a FIPS 140-2 compliant cryptographic algorithm.
<VulnDiscussion>Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote...Rule High Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
IBM z/OS permission bits and user audit bits for HFS objects that are part of the Syslog daemon component must be configured properly.
<VulnDiscussion>HFS directories and files of the Syslog daemon provide the configuration and executable properties of this product. Failure t...Rule Medium Severity -
SRG-OS-000104-GPOS-00051
<GroupDescription></GroupDescription>Group -
IBM z/OS Syslog daemon must be started at z/OS initialization.
<VulnDiscussion>To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...Rule Medium Severity -
SRG-OS-000104-GPOS-00051
<GroupDescription></GroupDescription>Group -
IBM z/OS Syslog daemon must be properly defined and secured.
<VulnDiscussion>The Syslog daemon, known as syslogd, is a zOS UNIX daemon that provides a central processing point for log messages issued by...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
IBM z/OS DFSMS resource class(es) must be defined to the GSO CLASMAP record in accordance with security requirements.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
IBM z/OS DFSMS Program Resources must be properly defined and protected.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
IBM z/OS DFSMS control data sets must be protected in accordance with security requirements.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
IBM z/OS DFMSM resource class(es)must be defined to the GSO SAFDEF record in accordance with security requirements.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...Rule Medium Severity -
SRG-OS-000080-GPOS-00048
<GroupDescription></GroupDescription>Group -
IBM z/OS DFSMS resources must be protected in accordance with the proper security requirements.
<VulnDiscussion>To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...Rule Medium Severity -
SRG-OS-000480-GPOS-00227
<GroupDescription></GroupDescription>Group -
IBM z/OS using DFSMS must properly specify SYS(x).PARMLIB(IGDSMSxx), SMS parameter settings.
<VulnDiscussion>Configuring the operating system to implement organization-wide security implementation guides and security checklists ensure...Rule Medium Severity -
SRG-OS-000032-GPOS-00013
<GroupDescription></GroupDescription>Group -
IBM z/OS PROFILE.TCPIP configuration statements for the TCP/IP stack must be coded properly.
<VulnDiscussion>Remote access services, such as those providing remote access to network devices and information systems, which lack automate...Rule Medium Severity -
SRG-OS-000297-GPOS-00115
<GroupDescription></GroupDescription>Group -
IBM z//OS must be configured to restrict all TCP/IP ports to ports, protocols, and/or services as defined in the PPSM CAL and vulnerability assessments.
<VulnDiscussion>Remote access services, such as those providing remote access to network devices and information systems, which lack automate...Rule Medium Severity
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