SV-38781r1: The NIS/NIS+/yp files must have mode 0755 or less permissive. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The NIS/NIS+/yp files must have mode 0755 or less permissive.

Description

Discussion Text

NIS/NIS+/yp files are part of the system's identification and authentication processes and are, therefore, critical to system security. Unauthorized modification of these files could compromise these processes and the system.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000225

Additional Details

Responsibility

System Administrator

IA Controls

ECLP-1

References

DPMS Target AIX 6.1 DISA DPMS Target AIX 6.1 2176

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.

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
# This script implements the OVAL definition oval:mil.disa.fso.aix11:def:78
check_mode() {
    local path="$1"
    local filename="$2"
    for file in $path/*$filename; do
        if [ -e "$file" ]; then
            stat -c "%a" "$file" | grep -qE '^[0-3][0-7][0-7]$' && return 0
        fi
    done
    return 1
}
if check_mode "/var/yp" ".*" || check_mode "/var/nis" ".*" || check_mode "/usr/lib/nis" ".*" || check_mode "/usr/lib/netsvc/yp" ".*"; then
    echo "FAIL"
    exit 1
else
    echo "PASS"
    exit 0
fi

Remediation

Change the mode of NIS/NIS+/yp files to 0755 or less permissive.

Procedure (example):
# chmod 0755 <filename>