STIGQter: STIG Summary: Riverbed NetIM OS Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 11 Sep 2025:

Ubuntu OS must generate audit records for successful/unsuccessful uses of the chmod, fchmod, and fchmodat system calls.

DISA Rule

SV-275718r1148292_rule

Vulnerability Number

V-275718

Group Title

SRG-OS-000064-GPOS-00033

Rule Version

RIIM-OS-654155

Severity

CAT II

CCI(s)

• CCI-000172 - Generate audit records for the event types defined in AU-2 c that include the audit record content defined in AU-3.

Weight

10

Fix Recommendation

Configure the audit system to generate an audit event for any successful/unsuccessful use of the "chmod", "fchmod", and "fchmodat" system calls.

Add or modify the following lines in the "/etc/audit/rules.d/stig.rules":

-a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_chng
-a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=unset -k perm_chng

To reload the rules file, issue the following command:

$ sudo augenrules --load

Note: The "-k <keyname>" at the end of the line gives the rule a unique meaning to help during an audit investigation. The <keyname> does not need to match the example above.

Check Contents

Verify Ubuntu OS generates an audit record upon successful/unsuccessful attempts to use the "chmod", "fchmod", and "fchmodat" system calls by using the following command:

$ sudo auditctl -l | grep chmod
-a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=-1 -F key=perm_chng
-a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=-1 -F key=perm_chng

If the command does not return audit rules for the "chmod", "fchmod", and "fchmodat" syscalls or the lines are commented out, this is a finding.

Note: The "key=" value is arbitrary and can be different from the example output above.

Vulnerability Number

V-275718

Documentable

False

Rule Version

RIIM-OS-654155

Severity Override Guidance

Verify Ubuntu OS generates an audit record upon successful/unsuccessful attempts to use the "chmod", "fchmod", and "fchmodat" system calls by using the following command:

$ sudo auditctl -l | grep chmod
-a always,exit -F arch=b32 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=-1 -F key=perm_chng
-a always,exit -F arch=b64 -S chmod,fchmod,fchmodat -F auid>=1000 -F auid!=-1 -F key=perm_chng

If the command does not return audit rules for the "chmod", "fchmod", and "fchmodat" syscalls or the lines are commented out, this is a finding.

Note: The "key=" value is arbitrary and can be different from the example output above.

Check Content Reference

M

Target Key

5706