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-63587r1_rule	DCNR-1	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	2015-03-26

Details

Check Text ( C-52241r2_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-54191r1_fix)
Edit the SSH daemon configuration and remove any MACs other than "hmac-sha1". If necessary, add a "MACs" line. Restart the SSH daemon. # /sbin/service sshd restart