SV-37826r3: The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms. | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.

Description

Discussion Text

DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001453

Additional Details

Responsibility

System Administrator

References

DPMS Target Red Hat 5 DISA DPMS Target Red Hat 5 2154

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.fso.rhel11:def:333
# The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# SSH daemon is configured to only use hmac-sha1
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^[ 	

]*[Mm][Aa][Cc][Ss][ 	

]+hmac-sha1[ 	

]*$' '/etc/ssh/sshd_config' &>/dev/null
}
# SSH daemon is configured to only use hmac-sha1
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  ! ( grep -Pq '^[ 	

]*[Mm][Aa][Cc][Ss][ -~]+\b(hmac-md5|hmac-ripemd160|hmac-96)' '/etc/ssh/sshd_config' &>/dev/null )
}

if ( test_1 && test_2 ); then
  echo "PASS"
else
  echo "FAIL"
fi

Remediation

Edit the SSH daemon configuration and remove any MACs that are not hmac-sha1 or a better hmac algorithm that is on the FIPS 140-2 approved list. If necessary, add a MACs line.

Restart the SSH daemon.
# /sbin/service sshd restart