The SUSE operating system SSH daemon must perform strict mode checking of home directory configuration files.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-235010	SLES-15-040260	SV-235010r991589_rule		Medium

Description
If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.

STIG	Date
SUSE Linux Enterprise Server 15 Security Technical Implementation Guide	2024-05-30

Details

Check Text ( C-38198r951643_chk )
Verify the SUSE operating system SSH daemon performs strict mode checking of home directory configuration files. Check that the SSH daemon performs strict mode checking of home directory configuration files with the following command: > sudo /usr/sbin/sshd -dd 2>&1 \| awk '/filename/ {print $4}' \| tr -d '\r' \| tr '\n' ' ' \| xargs sudo grep -iH '^\s*strictmodes' StrictModes yes If "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding.

Check Text ( C-38198r951643_chk )

Verify the SUSE operating system SSH daemon performs strict mode checking of home directory configuration files.

Check that the SSH daemon performs strict mode checking of home directory configuration files with the following command:

> sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*strictmodes'

StrictModes yes

If "StrictModes" is set to "no", is missing, or the returned line is commented out, this is a finding.

Fix Text (F-38161r619300_fix)
Configure the SUSE operating system SSH daemon performs strict mode checking of home directory configuration files. Uncomment the "StrictModes" keyword in "/etc/ssh/sshd_config" and set the value to "yes": StrictModes yes