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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.