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

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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 M6	SV-39376r1_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-38321r1_chk )
Open a terminal session and enter the following command. grep -i macs /etc/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-33611r1_fix)
Open a terminal session and edit the SSH client configuration file "/etc/ssh_config" and remove any MACs other than "hmac-sha1".