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The SSH client 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-22463 GEN005512 SV-37836r1_rule DCNR-1 Medium
Description
DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions.
STIG Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide 2014-01-09

Details

Check Text ( C-37033r1_chk )
Check the SSH client configuration for allowed MACs.
# grep -i macs /etc/ssh/ssh_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-32301r1_fix)
Edit the SSH client configuration and remove any MACs other than "hmac-sha1". If necessary, add a "MACs" line.