The SSH daemon must use privilege separation.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Associated with: CCI-000366

SV-86889r2_rule The SSH daemon must use privilege separation.

Vulnerability discussion

SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section.

Check content

Verify the SSH daemon performs privilege separation. Check that the SSH daemon performs privilege separation with the following command: # grep -i usepriv /etc/ssh/sshd_config UsePrivilegeSeparation sandbox If the "UsePrivilegeSeparation" keyword is set to "no", is missing, or the retuned line is commented out, this is a finding.

Fix text

Uncomment the "UsePrivilegeSeparation" keyword in "/etc/ssh/sshd_config" (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor) and set the value to "sandbox" or "yes": UsePrivilegeSeparation sandbox The SSH service must be restarted for changes to take effect.

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