SV-274021r1120695: Amazon Linux 2023 must monitor remote access methods. | Amazon Linux 2023 STIG SCAP Benchmark

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Assessment Title

Rule Text

Amazon Linux 2023 must monitor remote access methods.

Description

Discussion Text

Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access management difficult at best.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000067

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:274021
# Amazon Linux 2023 must monitor remote access methods.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# rsyslog: auth.* is configured to be logged
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( grep -Pq '^[ \t]*(?:\S+;auth\.\*|auth\.\*;\S+|auth\.\*|\S+;auth\.\*;\S+)[ \t]+\S+[ \t\S]*$' '/etc/rsyslog.conf' &>/dev/null ) || ( grep -rqP --include='*.conf' '^[ \t]*(?:\S+;auth\.\*|auth\.\*;\S+|auth\.\*|\S+;auth\.\*;\S+)[ \t]+\S+[ \t\S]*$' '/etc/rsyslog.d' &>/dev/null )
}
# rsyslog: authpriv.* is configured to be logged
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ( grep -Pq '^[ \t]*(?:\S+;authpriv\.\*|authpriv\.\*;\S+|authpriv\.\*|\S+;authpriv\.\*;\S+)[ \t]+\S+[ \t\S]*$' '/etc/rsyslog.conf' &>/dev/null ) || ( grep -rqP --include='*.conf' '^[ \t]*(?:\S+;authpriv\.\*|authpriv\.\*;\S+|authpriv\.\*|\S+;authpriv\.\*;\S+)[ \t]+\S+[ \t\S]*$' '/etc/rsyslog.d' &>/dev/null )
}
# rsyslog: daemon.* is configured to be logged
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  ( grep -Pq '^[ \t]*(?:\S+;daemon\.\*|daemon\.\*;\S+|daemon\.\*|\S+;daemon\.\*;\S+)[ \t]+\S+[ \t\S]*$' '/etc/rsyslog.conf' &>/dev/null ) || ( grep -rqP --include='*.conf' '^[ \t]*(?:\S+;daemon\.\*|daemon\.\*;\S+|daemon\.\*|\S+;daemon\.\*;\S+)[ \t]+\S+[ \t\S]*$' '/etc/rsyslog.d' &>/dev/null )
}

if ( test_1 && test_2 && test_3 ); 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:mil.disa.stig.amzlx23os:def:274021
if ! command -v yum &> /dev/null; then echo "FAIL"; exit 1; fi
if ! sudo yum install -y rsyslog &> /dev/null; then echo "FAIL"; exit 1; fi
if ! [ -f "/etc/rsyslog.conf" ]; then echo "PASS"; exit 0; fi
if grep -q "^[ \\t]*(?:\\S+;auth\\.\\*|auth\\.\\*;\\S+|auth\\.\\*|\\S+;auth\\.\\*;\\S+)[ \\t]+\\S+[ \\t\\S]*$" /etc/rsyslog.conf && \
   grep -q "^[ \\t]*(?:\\S+;authpriv\\.\\*|authpriv\\.\\*;\\S+|authpriv\\.\\*|\\S+;authpriv\\.\\*;\\S+)[ \\t]+\\S+[ \\t\\S]*$" /etc/rsyslog.conf && \
   grep -q "^[ \\t]*(?:\\S+;daemon\\.\\*|daemon\\.\\*;\\S+|daemon\\.\\*|\\S+;daemon\\.\\*;\\S+)[ \\t]+\\S+[ \\t\\S]*$" /etc/rsyslog.conf; then
   echo "PASS"; exit 0; fi
echo "FAIL"; exit 1;

Remediation

Configure Amazon Linux 2023 to monitor all remote access methods by installing rsyslog with the following command:

$ sudo yum install rsyslog

Then add or update the following lines to the "/etc/rsyslog.conf" file:

auth.*;authpriv.*;daemon.* /var/log/secure

The "rsyslog" service must be restarted for the changes to take effect. To restart the "rsyslog" service, run the following command:

$ sudo systemctl restart rsyslog.service