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II - Mission Support Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-OS-000356-GPOS-00144

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

    &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-000370-GPOS-00155

    <GroupDescription></GroupDescription>
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  • IBM RACF must define UACC of NONE on all profiles.

    &lt;VulnDiscussion&gt;The operating system must employ a deny-all, permit-by-exception policy to allow the execution of authorized software program...
    Rule High Severity
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  • SRG-OS-000480-GPOS-00227

    <GroupDescription></GroupDescription>
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  • IBM z/OS PASSWORD data set and OS passwords must not be used.

    &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-00232

    <GroupDescription></GroupDescription>
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  • The IBM z/OS Policy Agent must employ a deny-all, allow-by-exception firewall policy for allowing connections to other systems.

    &lt;VulnDiscussion&gt;Failure to restrict network connectivity only to authorized systems permits inbound connections from malicious systems. It al...
    Rule Medium Severity
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  • SRG-OS-000368-GPOS-00154

    <GroupDescription></GroupDescription>
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  • Unsupported system software must not be installed and/ or active on the system.

    &lt;VulnDiscussion&gt;Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may pr...
    Rule High Severity
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  • SRG-OS-000368-GPOS-00154

    <GroupDescription></GroupDescription>
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  • IBM z/OS must not allow nonexistent or inaccessible LINKLIST libraries.

    &lt;VulnDiscussion&gt;Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may pr...
    Rule Medium Severity
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  • SRG-OS-000368-GPOS-00154

    <GroupDescription></GroupDescription>
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  • IBM z/OS must not allow nonexistent or inaccessible Link Pack Area (LPA) libraries.

    &lt;VulnDiscussion&gt;Control of program execution is a mechanism used to prevent execution of unauthorized programs. Some operating systems may pr...
    Rule Medium Severity
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  • SRG-OS-000095-GPOS-00049

    <GroupDescription></GroupDescription>
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  • IBM z/OS must not have inaccessible APF libraries defined.

    &lt;VulnDiscussion&gt;It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...
    Rule Medium Severity
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  • SRG-OS-000095-GPOS-00049

    <GroupDescription></GroupDescription>
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  • IBM zOS inapplicable PPT entries must be invalidated.

    &lt;VulnDiscussion&gt;It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission ob...
    Rule Medium Severity
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  • SRG-OS-000095-GPOS-00049

    <GroupDescription></GroupDescription>
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  • IBM z/OS LNKAUTH=APFTAB must be specified in the IEASYSxx member(s) in the currently active parmlib data set(s).

    &lt;VulnDiscussion&gt;Failure to specify LINKAUTH=APFTAB allows libraries other than those designated as APF to contain authorized modules which co...
    Rule Medium Severity
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  • SRG-OS-000095-GPOS-00049

    <GroupDescription></GroupDescription>
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  • IBM z/OS must not have duplicated sensitive utilities and/or programs existing in APF libraries.

    &lt;VulnDiscussion&gt;Removal of unneeded or non-secure functions, ports, protocols, and services mitigate the risk of unauthorized connection of d...
    Rule Low Severity
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  • SRG-OS-000396-GPOS-00176

    <GroupDescription></GroupDescription>
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  • The IBM z/OS systems requiring data-at-rest protection must properly employ IBM DS8880 or equivalent hardware solutions for full disk encryption.

    &lt;VulnDiscussion&gt;This control addresses the confidentiality and integrity of information at rest and covers user information and system inform...
    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 the operating system 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-000142-GPOS-00071

    <GroupDescription></GroupDescription>
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  • The IBM z/OS Policy Agent must contain a policy that manages excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of denial-of-service (DoS) attacks.

    &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-000031-GPOS-00012

    <GroupDescription></GroupDescription>
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  • The IBM z/OS must employ a session manager that conceals, 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 manage session lock after a 15-minute period of inactivity.

    &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-000030-GPOS-00011

    <GroupDescription></GroupDescription>
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  • IBM z/OS must employ a session 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-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;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-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;IBM z/OS system administrator must develop a procedure to remove or disable emergency accounts after the crisis is resolved o...
    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-000122-GPOS-00063

    <GroupDescription></GroupDescription>
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  • IBM z/OS system administrator must develop a procedure to provide an audit reduction capability that supports on-demand reporting requirements.

    &lt;VulnDiscussion&gt;The ability to generate on-demand reports, including after the audit data has been subjected to audit reduction, greatly faci...
    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 use...
    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 must 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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