SV-217161r991590: The SUSE operating system default permissions must be defined in such a way that all authenticated users can only read and modify their own files. | SUSE Linux Enterprise Server 12 STIG SCAP Benchmark

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Assessment Title

Rule Text

The SUSE operating system default permissions must be defined in such a way that all authenticated users can only read and modify their own files.

Description

Discussion Text

Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366SV-91869V-77173

References

DPMS Target SUSE Linux Enterprise Server 12 DISA DPMS Target SUSE Linux Enterprise Server 12 4033

Checks

DISA STIG (Manual Reference)

Verify the SUSE operating system defines default permissions for all authenticated users in such a way that the users can only read and modify their own files. 

Check the system default permissions with the following command:

# grep -i "umask" /etc/login.defs

UMASK 077

If the "UMASK" variable is set to "000", the severity is raised to a CAT I, and this is a finding.

If the value of "UMASK" is not set to "077", "UMASK" is commented out, or "UMASK" is missing completely, 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.sles12:def:140
# The SUSE operating system default permissions must be defined in such a way that all authenticated users can only read and modify their own files.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# textfilecontent54_object (textfilecontent54_test)
test_1() {
  (sed -En 's/^\s*UMASK\s+([^#\s]+)/\1/p' '/etc/login.defs') | grep -qxF '077'
}

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.sles12:def:140
if grep -qE '^\s*UMASK\s+077' /etc/login.defs; then echo "PASS"; else echo "FAIL"; fi
exit 1

Remediation

Configure the SUSE operating system to define the default permissions for all authenticated users in such a way that the users can only read and modify their own files.

Add or edit the "UMASK" parameter in the "/etc/login.defs" file to match the example below:

UMASK 077