SV-37512r2: Access to the "at" utility must be controlled via the at.allow and/or at.deny file(s). | Red Hat Enterprise Linux 5 Security Technical Implementation Guide

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Assessment Title

Rule Text

Access to the "at" utility must be controlled via the at.allow and/or at.deny file(s).

Description

Discussion Text

The "at" facility selectively allows users to execute jobs at deferred times. It is usually used for one-time jobs. The at.allow file selectively allows access to the "at" facility. If there is no at.allow file, there is no ready documentation of who is allowed to submit "at" jobs.

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

References

DPMS Target Red Hat 5 DISA DPMS Target Red Hat 5 2154

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.rhel11:def:210
# Access to the "at" utility must be controlled via the at.allow and/or at.deny file(s).
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# check /etc/at.allow existence
# file_object (file_test)
test_1() {
  test -e '/etc/at.allow' &>/dev/null
}
# check /etc/at.deny existence
# file_object (file_test)
test_2() {
  test -e '/etc/at.deny' &>/dev/null
}
# at package does not exist
# rpminfo_object (rpminfo_test)
test_3() {
  rpm -q --quiet 'at' &>/dev/null
}

if ( test_1 || test_2 || test_3 ); 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.fso.rhel11:def:210


if [ ! -x "$(command -v rpm)" ]; then
  echo "FAIL"
  exit 1
fi

if [ -e /etc/at.allow ] || [ -e /etc/at.deny ]; then
  echo "PASS"
  exit 0
else
  echo "FAIL"
  exit 1
fi

Remediation

Create at.allow and/or at.deny files containing appropriate lists of users to be allowed or denied access to the "at" daemon.