SV-216351r959010: X11 forwarding for SSH must be disabled. | Solaris 11 SPARC STIG SCAP Benchmark

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Assessment Title

Rule Text

X11 forwarding for SSH must be disabled.

Description

Discussion Text

As enabling X11 Forwarding on the host can permit a malicious user to secretly open another X11 connection to another remote client during the session and perform unobtrusive activities such as keystroke monitoring, if the X11 services are not required for the system's intended function, they should be disabled or restricted as appropriate to the user's needs.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-000366SV-60965V-48093

References

DPMS Target Solaris 11 SPARC DISA DPMS Target Solaris 11 SPARC 4022

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

#!/bin/bash
# Reconstructed from oval:mil.disa.stig.solaris11:def:61
# X11 forwarding for SSH must be disabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# X11Forwarding must be set to no in /etc/ssh/sshd_config.
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^[Xx]11[Ff][Oo][Rr][Ww][Aa][Rr][Dd][Ii][Nn][Gg]\s*(\S+)$/\1/p' '/etc/ssh/sshd_config') | grep -qxF 'no'
}

if test_1; then
  echo "PASS"
else
  echo "FAIL"
fi

Assessment Script Powered by AISandbox-executed

A standalone Shell script to assess this control automatically. Review before running it in your environment.

Syntax-checked and actually executed in an isolated sandbox (not the real system this checks) — confirmed to run without errors.

#!/bin/sh
# OVAL definition: oval:mil.disa.stig.solaris11:def:61
if [ ! -f "/etc/ssh/sshd_config" ]; then echo "PASS"; exit 0; fi
content=$(grep -E "^[Xx]11[Ff][Oo][Rr][Ww][Aa][Rr][Dd][Ii][Nn][Gg]" /etc/ssh/sshd_config | awk -F'[= ]' '{print $2}')
if [ -n "$content" ] && [ "$content" = "no" ]; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

The root role is required.

Modify the sshd_config file.

# pfedit /etc/ssh/sshd_config

Locate the line containing:

X11Forwarding 

Change it to:

X11Forwarding no

Restart the SSH service.

# svcadm restart svc:/network/ssh