SV-39352r1: The "at" directory must be group-owned by system, bin, sys, or cron. | AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

The "at" directory must be group-owned by system, bin, sys, or cron.

Description

Discussion Text

If the group of the "at" directory is not system, bin, sys, or cron, unauthorized users could be allowed to view or edit files containing sensitive information within the directory.

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:191
# The "at" directory must be group-owned by system, bin, sys, or cron.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Test group of /var/spool/cron/atjobs is root
# file_object (file_test)
test_1() {
  [ "$(stat -c '%g' '/var/spool/cron/atjobs')" -eq 0 ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /var/spool/cron/atjobs is bin
# file_object (file_test)
test_3() {
  [ "$(stat -c '%g' '/var/spool/cron/atjobs')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /var/spool/cron/atjobs is sys
# file_object (file_test)
test_5() {
  [ "$(stat -c '%g' '/var/spool/cron/atjobs')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group cron
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  grep -Pq '^cron:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /var/spool/cron/atjobs is cron
# file_object (file_test)
test_7() {
  [ "$(stat -c '%g' '/var/spool/cron/atjobs')" = "$(sed -En 's/^cron:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}

if ( test_1 || ( test_2 && test_3 ) || ( test_4 && test_5 ) || ( test_6 && test_7 ) ); 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
# DISA STIG / SCAP compliance check for "The 'at' directory must be group-owned by system, bin, sys, or cron."

# Check if /var/spool/cron/atjobs exists
if [ ! -e "/var/spool/cron/atjobs" ]; then
  echo "PASS"
  exit 0
fi

# Check group ownership of /var/spool/cron/atjobs
if [ $(stat -c "%G" "/var/spool/cron/atjobs") = "bin" ] || [ $(stat -c "%G" "/var/spool/cron/atjobs") = "sys" ] || [ $(stat -c "%G" "/var/spool/cron/atjobs") = "system" ] || [ $(stat -c "%G" "/var/spool/cron/atjobs") = "cron" ]; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

Change the group ownership of the file to bin, sys, system, or cron.

Procedure:
# chgrp cron /var/spool/cron/atjobs