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Check: GEN003255

SUSE Linux Enterprise Server v11 for System z STIG: GEN003255 (in versions v1 r12 through v1 r9)

Title

The at.deny file must not have an extended ACL. (Cat II impact)

Discussion

The "at" daemon control files restrict access to scheduled job manipulation and must be protected. Unauthorized modification of the at.deny file could result in Denial of Service to authorized "at" users or provide unauthorized users with the ability to run "at" jobs.

Check Content

Check the permissions of the file. # ls -lL /etc/at.deny If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding.

Fix Text

Remove the extended ACL from the file. # setfacl --remove-all /etc/at.deny

Additional Identifiers

Rule ID: SV-45642r1_rule

Vulnerability ID: V-22393

Group Title: GEN003255

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000225	The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-6	Least Privilege