SV-260516r1184061: Ubuntu 22.04 LTS must have an application firewall enabled. | Canonical Ubuntu 22.04 LTS STIG SCAP Benchmark

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Assessment Title

Rule Text

Ubuntu 22.04 LTS must have an application firewall enabled.

Description

Discussion Text

Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366

References

DPMS Target Canonical Ubuntu 22.04 LTS DISA DPMS Target Canonical Ubuntu 22.04 LTS 5594

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.ubuntu2204os:def:260516
# Ubuntu 22.04 LTS must have an application firewall enabled.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# systemdunitproperty_object (systemdunitproperty_test)
test_1() {
  (systemctl show -p 'ActiveState' --value 'ufw.service') | grep -qxF 'active'
}
# systemdunitproperty_object (systemdunitproperty_test)
test_2() {
  (systemctl show -p 'UnitFileState' --value 'ufw.service') | grep -qxF 'enabled'
}

if ( test_1 && test_2 ); 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.ubuntu2204os:def:260516


if ! command -v systemctl &> /dev/null; then
    echo "FAIL"
    exit 1
fi

if systemctl is-active --quiet ufw.service; then
    echo "PASS"
    exit 0
else
    if systemctl is-enabled --quiet ufw.service; then
        echo "PASS"
        exit 0
    else
        echo "FAIL"
        exit 1
    fi
fi

Remediation

Enable the ufw by using the following command: 
 
    $ sudo ufw enable

Note: Enabling the firewall will potentially disrupt ssh sessions.