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The SLES for vRealize must implement DoD-approved encryption to protect the confidentiality of remote access sessions - SSH Client.


Finding ID Version Rule ID IA Controls Severity
V-240354 VRAU-SL-000080 SV-240354r877398_rule Medium
Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information.
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2023-09-22


Check Text ( C-43587r766908_chk )
Check the SSH daemon configuration for DoD-approved encryption to protect the confidentiality of SSH remote connections by performing the following commands:

Check the "Ciphers" setting in the "ssh_config" file.
# grep -i Ciphers /etc/ssh/ssh_config | grep -v '#'

The output must contain either nothing or any number of the following algorithms:

If the output contains an algorithm not listed above, this is a finding.

Expected Output:
Ciphers aes256-ctr,aes128-ctr
Fix Text (F-43546r670802_fix)
Update the "Ciphers" directive with the following command:

# sed -i "/^[^#]*Ciphers/ c\Ciphers aes256-ctr,aes128-ctr" /etc/ssh/ssh_config

Save and close the file.