The SSH daemon must be configured to use only FIPS 140-2 approved ciphers.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-38617	RHEL-06-000243	SV-50418r2_rule		Medium

Description
Approved algorithms should impart some level of confidence in their implementation. These are also required for compliance.

STIG	Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide	2019-09-25

Details

Check Text ( C-46176r2_chk )
Only FIPS-approved ciphers should be used. To verify that only FIPS-approved ciphers are in use, run the following command: # grep -i "ciphers" /etc/ssh/sshd_config | grep -v '^#' If the output contains ciphers that are not FIPS-approved, or does not return a value, this is a finding.

Fix Text (F-43566r2_fix)
Limit the ciphers to FIPS-approved algorithms. The following line in "/etc/ssh/sshd_config" demonstrates the use of FIPS-approved ciphers: Ciphers aes128-ctr,aes192-ctr,aes256-ctr The man page "sshd_config(5)" contains a list of supported ciphers.