SV-280986r1184782: RHEL 10 must be configured so that the rsyslog daemon does not accept log messages from other servers unless the server is being used for log aggregation. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must be configured so that the rsyslog daemon does not accept log messages from other servers unless the server is being used for log aggregation.

Description

Discussion Text

Unintentionally running a rsyslog server accepting remote messages puts the system at increased risk. Malicious rsyslog messages sent to the server could exploit vulnerabilities in the server software, introduce misleading information into the system's logs, or fill the system's storage, leading to a denial of service. If the system is intended to be a log aggregation server, its use must be documented with the information system security officer.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002385

References

DPMS Target Red Hat Enterprise Linux 10 DISA DPMS Target Red Hat Enterprise Linux 10 5733

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.rhel10os:def:280986
# RHEL 10 must be configured so that the rsyslog daemon does not accept log messages from other servers unless the server is being used for log aggregation.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# no remote log acceptance
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  ( ! ( grep -Pq '' '/etc/rsyslog.conf' &>/dev/null ) ) || ( ! ( grep -rqP --include='*.conf' '' '/etc/rsyslog.d' &>/dev/null ) )
}

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:mil.disa.stig.rhel10os:def:280986

if [ ! -f "/etc/rsyslog.conf" ] || grep -qE "InputTCPServerRun|UDPServerRun|RELPServerRun|module\(load=\"imtcp\"\)|module\(load=\"imudp\"\)|module\(load=\"imrelp\"\)|input\(type=\"imudp\" port=\"514\"\)|input\(type=\"imtcp\" port=\"514\"\)|input\(type=\"imrelp\" port=\"514\"\)" /etc/rsyslog.conf ] || \
  [ -n "$(find /etc/rsyslog.d -type f -name "*.conf" -exec grep -E 'InputTCPServerRun|UDPServerRun|RELPServerRun|module\\(load=\"imtcp\"\)|module\\(load=\"imudp\"\)|module\\(load=\"imrelp\"\)|input\\(type=\"imudp\" port=\"514\"\)|input\\(type=\"imtcp\" port=\"514\"\)|input\\(type=\"imrelp\" port=\"514\"\)' {} + )" ]; then
    echo "FAIL"
    exit 1
else
    echo "PASS"
    exit 0
fi

Remediation

Configure RHEL 10 to not receive remote logs using rsyslog.

Remove the lines in "/etc/rsyslog.conf" and any files in the "/etc/rsyslog.d" directory that match any of the following:

InputTCPServerRun
UDPServerRun
RELPServerRun
module(load="imtcp")
module(load="imudp")
module(load="imrelp")
input(type="imudp" port="514")
input(type="imtcp" port="514")
input(type="imrelp" port="514")

Restart the rsyslog daemon with the following command for the changes to take effect:

$ sudo systemctl restart rsyslog.service