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IBM z/OS TSS Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-OS-000356-GPOS-00144

    <GroupDescription></GroupDescription>
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  • IBM z/OS PARMLIB CLOCKxx must have the Accuracy PARM coded properly.

    &lt;VulnDiscussion&gt;Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the cor...
    Rule Medium Severity
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  • SRG-OS-000420-GPOS-00186

    <GroupDescription></GroupDescription>
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  • The IBM z/OS Policy Agent must contain a policy that protects against or limits the effects of denial-of-service (DoS) attacks by ensuring IBM z/OS is implementing rate-limiting measures on impacted network interfaces.

    &lt;VulnDiscussion&gt;DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot ac...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • IBM z/OS must configure system wait times to protect resource availability based on site priorities.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule Medium Severity
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  • SRG-OS-000031-GPOS-00012

    <GroupDescription></GroupDescription>
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  • IBM z/OS must employ a session manager to conceal, via the session lock, information previously visible on the display with a publicly viewable image.

    &lt;VulnDiscussion&gt;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
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  • SRG-OS-000029-GPOS-00010

    <GroupDescription></GroupDescription>
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  • IBM z/OS must employ a session manager to initiate a session lock after a 15-minute period of inactivity for all connection types.

    &lt;VulnDiscussion&gt;A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinit...
    Rule Medium Severity
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  • SRG-OS-000028-GPOS-00009

    <GroupDescription></GroupDescription>
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  • IBM z/OS must employ a session manager to manage retaining a users session lock until that user reestablishes access using established identification and authentication procedures.

    &lt;VulnDiscussion&gt;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
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  • SRG-OS-000002-GPOS-00002

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to remove or disable temporary user accounts after 72 hours.

    &lt;VulnDiscussion&gt;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
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  • SRG-OS-000123-GPOS-00064

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to remove or disable emergency accounts after the crisis is resolved or 72 hours.

    &lt;VulnDiscussion&gt;Emergency accounts are privileged accounts that are established in response to crisis situations where the need for rapid acc...
    Rule Medium Severity
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  • SRG-OS-000304-GPOS-00121

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to notify System Administrators and ISSOs of account enabling actions.

    &lt;VulnDiscussion&gt;Once an attacker establishes access to a system, the attacker often attempts to create a persistent method of reestablishing ...
    Rule Medium Severity
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  • SRG-OS-000363-GPOS-00150

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to notify designated personnel if baseline configurations are changed in an unauthorized manner.

    &lt;VulnDiscussion&gt;Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized ...
    Rule Medium Severity
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  • SRG-OS-000126-GPOS-00066

    <GroupDescription></GroupDescription>
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  • 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.

    &lt;VulnDiscussion&gt; If a maintenance session or connection remains open after maintenance is completed, it may be hijacked by an attacker and us...
    Rule Medium Severity
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  • SRG-OS-000437-GPOS-00194

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to remove all software components after updated versions have been installed.

    &lt;VulnDiscussion&gt;Previous versions of software components that are not removed from the information system after updates have been installed m...
    Rule Medium Severity
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  • SRG-OS-000447-GPOS-00201

    <GroupDescription></GroupDescription>
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  • 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.

    &lt;VulnDiscussion&gt;If anomalies are not acted upon, security functions may fail to secure the system. Security function is defined as the hard...
    Rule Medium Severity
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  • SRG-OS-000479-GPOS-00224

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to offload SMF files to a different system or media than the system being audited.

    &lt;VulnDiscussion&gt;The task of allocating audit record storage capacity is usually performed during initial installation of the operating system...
    Rule Medium Severity
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  • SRG-OS-000030-GPOS-00011

    <GroupDescription></GroupDescription>
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  • IBM z/OS must employ a session manager for users to directly initiate a session lock for all connection types.

    &lt;VulnDiscussion&gt;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
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  • SRG-OS-000033-GPOS-00014

    <GroupDescription></GroupDescription>
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  • The SSH daemon must be configured to use a FIPS 140-2 compliant cryptographic algorithm.

    &lt;VulnDiscussion&gt;Audit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destina...
    Rule High Severity
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  • SRG-OS-000096-GPOS-00050

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  • IBM z/OS SSH daemon must be configured to only use the SSHv2 protocol.

    &lt;VulnDiscussion&gt;In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....
    Rule High Severity
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  • SRG-OS-000080-GPOS-00048

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  • IBM z/OS permission bits and user audit bits for HFS objects that are part of the Syslog daemon component must be configured properly.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule Medium Severity
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  • SRG-OS-000104-GPOS-00051

    <GroupDescription></GroupDescription>
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  • The IBM z/OS Syslog daemon must not be started at z/OS initialization.

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule Medium Severity
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  • SRG-OS-000104-GPOS-00051

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  • The IBM z/OS Syslog daemon must be properly defined and secured.

    &lt;VulnDiscussion&gt;To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to pre...
    Rule Medium Severity
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  • SRG-OS-000080-GPOS-00048

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  • IBM z/OS DFSMS resources must be protected in accordance with the proper security requirements.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule Medium Severity
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  • SRG-OS-000080-GPOS-00048

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  • IBM z/OS DFSMS Program Resources must be properly defined and protected.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule Medium Severity
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  • SRG-OS-000080-GPOS-00048

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  • IBM z/OS DFSMS control data sets must be protected in accordance with security requirements.

    &lt;VulnDiscussion&gt;To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-ap...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

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  • IBM z/OS using DFSMS must properly specify SYS(x).PARMLIB(IGDSMSxx), SMS parameter settings.

    &lt;VulnDiscussion&gt;Configuring the operating system to implement organization-wide security implementation guides and security checklists ensure...
    Rule Medium Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • IBM z/OS DFSMS control data sets must be properly protected.

    &lt;VulnDiscussion&gt;Configuring the operating system to implement organization-wide security implementation guides and security checklists ensure...
    Rule Medium Severity
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