The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.

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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 M6	SV-39369r2_rule	DCNR-1	Medium

Description
DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions.

STIG	Date
MAC OSX 10.6 Workstation Security Technical Implementation Guide Draft	2013-01-10

Details

Check Text ( C-38315r1_chk )
Open a terminal session and enter the following command. grep -i macs /etc/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-33604r2_fix)
Open a terminal session and edit the SSH daemon configuration file "/etc/sshd_config" and remove any MACs other than "hmac-sha1". If there is no MACs line in "/etc/sshd_config", add "MACs hmac-sha1" to the file. Restart the SSH daemon for the changes to take effect.