SV-281350r1167200: RHEL 10 must limit the number of bogus Internet Control Message Protocol (ICMP) response errors logs. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must limit the number of bogus Internet Control Message Protocol (ICMP) response errors logs.

Description

Discussion Text

Some routers will send responses to broadcast frames that violate RFC-1122, which fills up a log file system with many useless error messages. An attacker may take advantage of this and attempt to flood the logs with bogus error logs. Ignoring bogus ICMP error responses reduces log size, although some activity would not be logged. Satisfies: SRG-OS-000420-GPOS-00186, SRG-OS-000142-GPOS-00081

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

IA Controls

NIST SP 800-53

Not mappedCCI-002385Not mappedCCI-001105

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:281350
# RHEL 10 must limit the number of bogus Internet Control Message Protocol (ICMP) response errors logs.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# net.ipv4.icmp_ignore_bogus_error_responses setting in kernel is 1
# sysctl_object (sysctl_test)
test_1() {
  [ "$(cat /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses)" -eq 1 ]
}

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
# DISA STIG RHEL 10 ICMP error logging compliance check

if [ ! -f "/etc/sysctl.d/ipv4_icmp_ignore_bogus_error_responses.conf" ]; then
    echo "FAIL"
    exit 1
fi

if grep -q "^net.ipv4.icmp_ignore_bogus_error_responses = 1$" /etc/sysctl.d/ipv4_icmp_ignore_bogus_error_responses.conf; then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Configure RHEL 10 to not log bogus ICMP errors.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/ipv4_icmp_ignore_bogus_error_responses.conf

Add the following line to the file:

net.ipv4.icmp_ignore_bogus_error_responses = 1

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system