The SUSE operating system 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-77457	SLES-12-030180	SV-92153r2_rule		Medium

Description
Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g., RDP) is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash. Satisfies: SRG-OS-000125-GPOS-00065, SRG-OS-000394-GPOS-00174

Description

Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Remote access (e.g., RDP) is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, nonorganization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Cryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the secret key used to generate the hash. Satisfies: SRG-OS-000125-GPOS-00065, SRG-OS-000394-GPOS-00174

STIG	Date
SLES 12 Security Technical Implementation Guide	2020-06-30

Details

Check Text ( C-77015r2_chk )
Verify the SUSE operating system SSH daemon is configured to only use MACs that employ FIPS 140-2 approved ciphers. Check that the SSH daemon is configured to only use MACs that employ FIPS 140-2 approved ciphers with the following command: # sudo grep -i macs /etc/ssh/sshd_config MACs hmac-sha2-256,hmac-sha2-512 If any ciphers other than "hmac-sha2-256" or "hmac-sha2-512" are listed or the returned line is commented out, this is a finding.

Check Text ( C-77015r2_chk )

Verify the SUSE operating system SSH daemon is configured to only use MACs that employ FIPS 140-2 approved ciphers.

Check that the SSH daemon is configured to only use MACs that employ FIPS 140-2 approved ciphers with the following command:

# sudo grep -i macs /etc/ssh/sshd_config
MACs hmac-sha2-256,hmac-sha2-512

If any ciphers other than "hmac-sha2-256" or "hmac-sha2-512" are listed or the returned line is commented out, this is a finding.

Fix Text (F-84097r1_fix)
Configure the SUSE operating system SSH daemon to only use MACs that employ FIPS 140-2 approved ciphers. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "MACs" keyword and set its value to "hmac-sha2-256" and/or "hmac-sha2-512" (The file might be named differently or be in a different location): MACs hmac-sha2-256,hmac-sha2-512