The Red Hat Enterprise Linux operating system must be configured so that the SSH daemon uses privilege separation.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-204601	RHEL-07-040460	SV-204601r603261_rule		Medium

Description
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.

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2021-03-01

Details

Check Text ( C-4725r88995_chk )
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 returned line is commented out, this is a finding.

Fix Text (F-4725r88996_fix)
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.