SV-281082r1195406: RHEL 10 must define default permissions for all authenticated users in such a way that the user can read and modify only their own files. | Red Hat Enterprise Linux 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 10 must define default permissions for all authenticated users in such a way that the user can read and modify only 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-000213

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:281082
# RHEL 10 must define default permissions for all authenticated users in such a way that the user can read and modify only 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.rhel10os:def:281082


if grep -q '^\\s*UMASK\\s+077' /etc/login.defs; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

Configure RHEL 10 to define default permissions for all authenticated users in such a way that the user can read and modify only their own files.

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

umask 077