Detections
Analytics
PHTN-40-000239 - The Photon operating system must implement only approved Message Authentication Codes (MACs) to protect the integrity of remote access sessions.
Information
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.
Solution
Navigate to and open:/etc/ssh/sshd_config
Ensure the "MACs" line is uncommented and set to the following:
MACs hmac-sha2-512,hmac-sha2-256
At the command line, run the following command:
# systemctl restart sshd.service
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_VMW_vSphere_8-0_Y24M08_STIG.zip
Item Details
Category: ACCESS CONTROL
References: 800-53|AC-17(2), CAT|I, CCI|CCI-001453, Rule-ID|SV-258900r991554_rule, STIG-ID|PHTN-40-000239, Vuln-ID|V-258900
Plugin: Unix
Control ID: 517afde6db7e6541ce0de40c5f32ce0da200f4086475a411435b9684669208c0