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

From VMware vRealize Automation 7.x SLES Security Technical Implementation Guide

Part of SRG-OS-000033-GPOS-00014

Associated with: CCI-000068

SV-100133r1_rule The SLES for vRealize must implement DoD-approved encryption to protect the confidentiality of remote access sessions- SSH Daemon.

Vulnerability discussion

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.

Check content

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 "sshd_config" file. # grep -i Ciphers /etc/ssh/sshd_config | grep -v '#' The output must contain either nothing or any number of the following algorithms: aes128-ctr, aes256-ctr. If the output contains an algorithm not listed above, this is a finding. Expected Output: Ciphers aes256-ctr,aes128-ctr

Fix text

Update the Ciphers directive with the following command: # sed -i "/^[^#]*Ciphers/ c\Ciphers aes256-ctr,aes128-ctr" /etc/ssh/sshd_config Save and close the file. Restart the sshd process: # service sshd restart

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