V-258835

Discussion

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.

Check Content

At the command line, run the following command to verify the running configuration of sshd:

# sshd -T|&grep -i Ciphers

Expected result:

ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr

If the output matches the ciphers in the expected result or a subset thereof, this is not a finding.

If the ciphers in the output contain any ciphers not listed in the expected result, this is a finding.