SV-274142r1208254: Amazon Linux 2023 must automatically exit interactive command shell user sessions after 10 minutes of inactivity. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must automatically exit interactive command shell user sessions after 10 minutes of inactivity.

Description

Discussion Text

Terminating an idle interactive command shell user session within a short time period reduces the window of opportunity for unauthorized personnel to take control of it when left unattended in a virtual terminal or physical console.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000057Not mappedCCI-001133

References

DPMS Target Amazon Linux 2023 DISA DPMS Target Amazon Linux 2023 5700

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.amzlx23os:def:274142
# Amazon Linux 2023 must automatically exit interactive command shell user sessions after 10 minutes of inactivity.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# TMOUT is set to 600 or less in /etc/profile and /etc/profile.d/*.sh
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( [ "$(sed -En 's/^[^#]*\s*TMOUT=(\d+)\s*$/\1/p' '/etc/profile')" -le 600 ] ) || ( [ "$(grep -rhP --include='*.sh' '^[^#]*\s*TMOUT=(\d+)\s*$' '/etc/profile.d' | sed -En 's/^[^#]*\s*TMOUT=(\d+)\s*$/\1/p')" -le 600 ] )
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL Definition: oval:mil.disa.stig.amzlx23os:def:274142
if [ ! -f /etc/profile ] || grep -qE '^[^#]*\s*TMOUT=(\d+)$' /etc/profile && [ $(grep -oE '[0-9]+' /etc/profile | head -n 1) -le 600 ]; then
    if [ ! -d /etc/profile.d ] || [ ! -f /etc/profile.d/tmout.sh ] || ! grep -qE '^[^#]*\s*TMOUT=600' /etc/profile.d/tmout.sh; then
        echo "FAIL"
        exit 1
    fi
fi
echo "PASS"
exit 0

Remediation

Configure Amazon Linux 2023 to exit interactive command shell user sessions after 10 minutes of inactivity.

Add or edit the following line in "/etc/profile.d/tmout.sh":

#!/bin/bash

declare -xr TMOUT=600