IBM AIX
TMA-AIX-4.7.6
Unattended terminal session timeout is 900 seconds (or less) - readonly
MediumLevel 2Automatedaix
Description
TMOUT and TIMEOUT are environmental settings that activate the timeout of a shell. readonly TMOUT both exports and locks the variable, preventing unwanted modification during run-time. All systems are vulnerable if terminals are left logged in and unattended. Audit: /etc/profile must set TMOUT and TIMEOUT to 1-900 seconds and mark them readonly.
How it is checked
Audit method: Shell command
shell
[ -r /etc/profile ] || exit 1; t=$(sed -n "s/^[[:blank:]]*TMOUT=\([0-9][0-9]*\).*/\1/p" /etc/profile | tail -n 1); u=$(sed -n "s/^[[:blank:]]*TIMEOUT=\([0-9][0-9]*\).*/\1/p" /etc/profile | tail -n 1); if [ -n "$t" ] && [ "$t" -ge 1 ] && [ "$t" -le 900 ] && [ -n "$u" ] && [ "$u" -ge 1 ] && [ "$u" -le 900 ] && grep -Eq "^[[:blank:]]*(readonly)[[:blank:]].*TMOUT" /etc/profile; then echo compliant; else echo "TMOUT=$t TIMEOUT=$u"; fi- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
Review /etc/profile to verify that TMOUT and TIMEOUT are configured to no more than 900 seconds and are readonly, with the readonly statement last: TMOUT=900 TIMEOUT=900 readonly TMOUT TIMEOUT
Properties
- Operating systems
- Any
- Tags
- aixhardening
- Reference
- CIS IBM AIX 7 Benchmark v1.2.0 - 4.7.6 Unattended terminal session timeout is 900 seconds (or less) - readonly
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
shell
tmaegis scan --target aix --level 2