SV-281282r1166798: RHEL 10 must conceal, via the session lock, information previously visible on the display with a publicly viewable image. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must conceal, via the session lock, information previously visible on the display with a publicly viewable image.

Description

Discussion Text

Setting the screensaver mode to blank-only conceals the contents of the display from passersby.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000060

References

DPMS Target Red Hat Enterprise Linux 10 DISA DPMS Target Red Hat Enterprise Linux 10 5733

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.rhel10os:def:281282
# RHEL 10 must conceal, via the session lock, information previously visible on the display with a publicly viewable image.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# The operating system GUI is configured to use a blank screensaver.
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (grep -rhP --include='*' '^\s*\[org\/gnome\/desktop\/screensaver]\s*\n+[^\[]*picture-uri\s*=\s*(\S+)$' '/etc/dconf/db/local.d' | sed -En 's/^\s*\[org\\/gnome\\/desktop\\/screensaver]\s*\n+[^\[]*picture-uri\s*=\s*(\S+)$/\1/p') | grep -qxF ''\'''\'''
}
# The operating system GUI is configured to prevent users from changing the screensaver.
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*' '^\s*\/org\/gnome\/desktop\/screensaver\/picture-uri$' '/etc/dconf/db/local.d/locks' &>/dev/null
}

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.rhel10os:def:281282

if [ ! -d "/etc/dconf/db/local.d" ]; then echo "FAIL"; exit 1; fi
if [ ! -f "/etc/dconf/db/local.d/00-security-settings" ]; then echo "FAIL"; exit 1; fi
if ! grep -q "^\\s*\\[org\\/gnome\\/desktop\\/screensaver]\\s*\\n+[^\\[]*picture-uri\\s*=\\s*''$" /etc/dconf/db/local.d/00-security-settings; then echo "FAIL"; exit 1; fi
if [ ! -d "/etc/dconf/db/local.d/locks" ]; then echo "FAIL"; exit 1; fi
if [ ! -f "/etc/dconf/db/local.d/locks/00-security-settings-lo" ]; then echo "FAIL"; exit 1; fi
echo "PASS"; exit 0

Remediation

Configure RHEL 10 to prevent a user from overriding the picture-uri setting for graphical user interfaces.

Note: The example below is using the database "local" for the system. If the system is using another database in "/etc/dconf/profile/user", the file should be created under the appropriate subdirectory.

Update the "/etc/dconf/db/local.d/00-security-settings" file to prevent a user from overriding the "picture-uri" setting:

$ sudo vi /etc/dconf/db/local.d/00-security-settings

[org/gnome/desktop/screensaver]
picture-uri=''

Update the "/etc/dconf/db/local.d/locks/00-security-settings-lock" file to prevent a user from modifying the lock applied to the "picture-uri" setting:

$ sudo vi /etc/dconf/db/local.d/locks/00-security-settings-lock

/org/gnome/desktop/screensaver/picture-uri

Update the dconf system databases:

$ sudo dconf update