SV-204432r991591: The Red Hat Enterprise Linux operating system must not allow an unattended or automatic logon to the system via a graphical user interface. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must not allow an unattended or automatic logon to the system via a graphical user interface.

Description

Discussion Text

Failure to restrict system access to authenticated users negatively impacts operating system security.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366V-71953SV-86577

References

DPMS Target Red Hat Enterprise Linux 7 DISA DPMS Target Red Hat Enterprise Linux 7 2899

Checks

DISA STIG (Manual Reference)

Verify the operating system does not allow an unattended or automatic logon to the system via a graphical user interface.

Note: If the system does not have GNOME installed, this requirement is Not Applicable. 

Check for the value of the "AutomaticLoginEnable" in the "/etc/gdm/custom.conf" file with the following command:

# grep -i automaticloginenable /etc/gdm/custom.conf
AutomaticLoginEnable=false

If the value of "AutomaticLoginEnable" is not set to "false", this is a finding.

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.rhel7:def:1119
# The Red Hat Enterprise Linux operating system must not allow an unattended or automatic logon to the system via a graphical user interface.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# package gdm is installed
# rpminfo_object (rpminfo_test)
test_1() {
  rpm -q --quiet 'gdm' &>/dev/null
}
# AutomaticLoginEnable present in daemon section
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^\[daemon]\n(?!([^\n]*\n+)*\[[^\n\]]*]([^\n]*\n+)*AutomaticLoginEnable[ ]?=[ ]?)([^\n]*\n+)*AutomaticLoginEnable[ ]?=[ ]?' '/etc/gdm/custom.conf' &>/dev/null
}
# All AutomaticLoginEnable lines are set correctly
# textfilecontent54_object (textfilecontent54_test)
test_3() {
  (sed -En 's/^[ ]*AutomaticLoginEnable[ ]?=[ ]?([^\W]*)[ ]*$/\1/p' '/etc/gdm/custom.conf') | grep -Pq '^[Ff][Aa][Ll][Ss][Ee]$'
}

if ( test_1 || ( test_2 && test_3 ) ); 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.rhel7:def:1119
if rpm -q gdm > /dev/null 2>&1; then
    if grep -q "^\\[daemon]\\n.*AutomaticLoginEnable[ ]?=[ ]?false" /etc/gdm/custom.conf; then
        echo "PASS"
        exit 0
    fi
    echo "FAIL"
    exit 1
else
    echo "PASS"
    exit 0
fi

Remediation

Configure the operating system to not allow an unattended or automatic logon to the system via a graphical user interface.

Note: If the system does not have GNOME installed, this requirement is Not Applicable.

Add or edit the line for the "AutomaticLoginEnable" parameter in the [daemon] section of the "/etc/gdm/custom.conf" file to "false":

[daemon]
AutomaticLoginEnable=false