STIGQter STIGQter: STIG Summary: Red Hat Enterprise Linux 7 Security Technical Implementation Guide Version: 3 Release: 3 Benchmark Date: 23 Apr 2021:

The Red Hat Enterprise Linux operating system must be configured so that remote X connections are disabled except to fulfill documented and validated mission requirements.

DISA Rule

SV-204622r603849_rule

Vulnerability Number

V-204622

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-07-040710

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

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

The SSH service must be restarted for changes to take effect:

# systemctl restart sshd

Check Contents

Determine if X11Forwarding is disabled with the following command:

# grep -i x11forwarding /etc/ssh/sshd_config | grep -v "^#"

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 or is missing, this is a finding.

Vulnerability Number

V-204622

Documentable

False

Rule Version

RHEL-07-040710

Severity Override Guidance

Determine if X11Forwarding is disabled with the following command:

# grep -i x11forwarding /etc/ssh/sshd_config | grep -v "^#"

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 or is missing, this is a finding.

Check Content Reference

M

Target Key

2899

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