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


Overview

Finding ID Version Rule ID IA Controls Severity
V-22460 GEN005507 SV-63587r2_rule Medium
Description
DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions.
STIG Date
Oracle Linux 5 Security Technical Implementation Guide 2020-02-25

Details

Check Text ( C-52241r3_chk )
Check the SSH daemon configuration for allowed MACs.

Procedure:
# grep -i macs /etc/ssh/sshd_config | grep -v '^#'

If no lines are returned, or the returned MACs list contains any MAC that is not hmac-sha1 or a better hmac algorithm that is on the FIPS 140-2 approved list, this is a finding.
Fix Text (F-54191r2_fix)
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