SV-27324r1: The cron.allow file must have mode 0600 or less permissive. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The cron.allow file must have mode 0600 or less permissive.

Description

Discussion Text

A cron.allow file that is readable and/or writable by other than root could allow potential intruders and malicious users to use the file contents to help discern information, such as who is allowed to execute cron programs, which could be harmful to overall system and network security.

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.

#!/bin/bash
# Reconstructed from oval:mil.disa.fso.aix11:def:164
# The cron.allow file must have mode 0600 or less permissive.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Test mode of /var/adm/cron/cron.allow is 600 or less permissive
# file_object (file_test)
test_1() {
  ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,7,1)=="x" || substr($0,7,1)=="s")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,8,1)=="r")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,4,1)=="x" || substr($0,4,1)=="s")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,7,1)=="s" || substr($0,7,1)=="S")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,4,1)=="s" || substr($0,4,1)=="S")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,10,1)=="x" || substr($0,10,1)=="t")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,9,1)=="w")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,5,1)=="r")?"true":"false"}') | grep -qxF 'false' ) && ( (stat -c '%A' '/var/adm/cron/cron.allow' | awk '{print (substr($0,6,1)=="w")?"true":"false"}') | grep -qxF 'false' )
}

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
# This script implements the OVAL definition oval:mil.disa.fso.aix11:def:164
file="/var/adm/cron/cron.allow"
if [ ! -f "$file" ]; then echo "PASS"; exit 0; fi
mode=$(stat -c "%a" "$file")
if [ $((mode >> 6)) -eq 0 ] && [ $((mode >> 3)) -eq 0 ] && [ $((mode >> 2)) -eq 0 ] && [ $((mode >> 1)) -eq 0 ] && [ $((mode >> 0)) -eq 0 ]; then echo "PASS"; exit 0; fi
echo "FAIL"; exit 1

Remediation

Change the mode of the cron.allow file to 0600.

Procedure:
# chmod 0600 /var/adm/cron/cron.allow