SV-230383r1017192: RHEL 8 must define default permissions for all authenticated users in such a way that the user can only read and modify their own files. | Red Hat Enterprise Linux 8 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 8 must define default permissions for all authenticated users in such a way that the user 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-000366

References

DPMS Target Red Hat Enterprise Linux 8 DISA DPMS Target Red Hat Enterprise Linux 8 2921

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.rhel8os:def:230383
# RHEL 8 must define default permissions for all authenticated users in such a way that the user 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.

# /etc/login.defs:UMASK == 077
# 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.rhel8os:def:230383


if grep -qE "^\\s*UMASK\\s+([^#\\s]+)$" /etc/login.defs && awk -F'[ =]+' '/^UMASK/ {print $2}' /etc/login.defs | grep -qE "^077$"; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

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

Add or edit the line for the "UMASK" parameter in "/etc/login.defs" file to "077":

UMASK 077