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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22460	GEN005507	SV-26753r1_rule	DCNR-1	Medium

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

STIG	Date
Draft AIX Security Technical Implementation Guide	2011-08-17

Details

Check Text ( C-27762r1_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 other than hmac-sha1, this is a finding.

Fix Text (F-24003r1_fix)
Edit the SSH daemon configuration and remove any MACs other than hmac-sha1. If necessary, add a MACs line.