STIGQter: STIG Summary: SUSE Linux Enterprise Server 15 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

The SUSE operating system SSH daemon must disable forwarded remote X connections for interactive users, unless to fulfill documented and validated mission requirements.

DISA Rule

SV-235013r622137_rule

Vulnerability Number

V-235013

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

SLES-15-040290

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

Configure the SUSE operating system SSH daemon to disable forwarded X connections for interactive users.

Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11Forwarding" keyword and set its value to "no" (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):

X11Forwarding no

Check Contents

Determine if X11Forwarding is disabled with the following command:
Verify the SUSE operating system SSH daemon remote X forwarded connections for interactive users are disabled.

Check that SSH remote X forwarded connections are disabled with the following command:

> sudo grep -i x11forwarding /etc/ssh/sshd_config

X11Forwarding no

If the "X11Forwarding" keyword is set to "yes" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, is missing, or is commented out, this is a finding.

Vulnerability Number

V-235013

Documentable

False

Rule Version

SLES-15-040290

Severity Override Guidance

Determine if X11Forwarding is disabled with the following command:
Verify the SUSE operating system SSH daemon remote X forwarded connections for interactive users are disabled.

Check that SSH remote X forwarded connections are disabled with the following command:

> sudo grep -i x11forwarding /etc/ssh/sshd_config

X11Forwarding no

If the "X11Forwarding" keyword is set to "yes" and is not documented with the Information System Security Officer (ISSO) as an operational requirement, is missing, or is commented out, this is a finding.

Check Content Reference

M

Target Key

5274

Comments