STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

Successful/unsuccessful uses of the fremovexattr system call in TOSS must generate an audit record.

DISA Rule

SV-253036r991577_rule

Vulnerability Number

V-253036

Group Title

SRG-OS-000468-GPOS-00212

Rule Version

TOSS-04-031100

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

Fix Recommendation

Configure TOSS to audit the execution of the "fremovexattr" system call by adding or updating the following lines to "/etc/audit/rules.d/audit.rules":

-a always,exit -F arch=b32 -S fremovexattr -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b64 -S fremovexattr -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b32 -S fremovexattr -F auid=0 -k perm_mod
-a always,exit -F arch=b64 -S fremovexattr -F auid=0 -k perm_mod

The audit daemon must be restarted for the changes to take effect.

Check Contents

Verify if TOSS is configured to audit the execution of the "fremovexattr" system call, by running the following command:

$ sudo grep -w fremovexattr /etc/audit/audit.rules

-a always,exit -F arch=b32 -S fremovexattr -F auid>=1000 -F auid!=unset -k perm_mod
-a always,exit -F arch=b64 -S fremovexattr -F auid>=1000 -F auid!=unset -k perm_mod

-a always,exit -F arch=b32 -S fremovexattr -F auid=0 -k perm_mod
-a always,exit -F arch=b64 -S fremovexattr -F auid=0 -k perm_mod

If the command does not return all lines, or the lines are commented out, this is a finding.

Vulnerability Number

V-253036

Documentable

False

Rule Version

TOSS-04-031100

Severity Override Guidance

Check Content Reference

Target Key

5469