IBM z/OS ACF2 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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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 -
The IBM z/OS system administrator (SA) 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 (SAs) and information system security officers (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-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 Integrated Crypto Service Facility (ICSF) install data sets must be properly protected.
<VulnDiscussion>IBM Integrated Crypto Service Facility (ICSF) product has the ability to use privileged functions and/or have access to sensi...Rule Medium Severity -
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
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