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

Changes are coming to https://stigviewer.com. Take our survey to help us understand your usage and how we can better serve you in the future.
Take Survey

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-50418r1_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	2018-11-28

Details

Check Text ( C-46176r1_chk )
Only FIPS-approved ciphers should be used. To verify that only FIPS-approved ciphers are in use, run the following command: # grep Ciphers /etc/ssh/sshd_config The output should contain only those ciphers which are FIPS-approved, namely, the AES and 3DES ciphers. If that is not the case, this is a finding.

Fix Text (F-43566r1_fix)
Limit the ciphers to those algorithms which are FIPS-approved. Counter (CTR) mode is also preferred over cipher-block chaining (CBC) mode. The following line in "/etc/ssh/sshd_config" demonstrates use of FIPS-approved ciphers: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,aes128-cbc,3des-cbc,aes192-cbc,aes256-cbc The man page "sshd_config(5)" contains a list of supported ciphers.