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 fchownat system call in TOSS must generate an audit record.

DISA Rule

SV-253015r958446_rule

Vulnerability Number

V-253015

Group Title

SRG-OS-000064-GPOS-00033

Rule Version

TOSS-04-030620

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 the audit system to generate an audit event for any successful/unsuccessful use of the "fchownat" system call by adding or updating the following lines to "/etc/audit/rules.d/audit.rules":

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

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

Check Contents

Verify TOSS generates an audit record when successful/unsuccessful attempts to use the "fchownat" system call by performing the following command to check the file system rules in "/etc/audit/audit.rules":

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

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

If the command does not return a line, or the line is commented out, this is a finding.

Vulnerability Number

V-253015

Documentable

False

Rule Version

TOSS-04-030620

Severity Override Guidance

Check Content Reference

Target Key

5469