SV-278952r1135407: OL 9 must audit any script or executable called by cron as root or by any privileged user. | Oracle Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

OL 9 must audit any script or executable called by cron as root or by any privileged user.

Description

Discussion Text

Any script or executable called by cron as root or by any privileged user must be owned by that user, must have the permissions 0755 or more restrictive, and should have no extended rights that allow any nonprivileged user to modify the script or executable.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000130Not mappedCCI-000135Not mappedCCI-000169Not mappedCCI-000172Not mappedCCI-002884

References

DPMS Target Oracle Linux 9 DISA DPMS Target Oracle Linux 9 5680

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.ol9os:def:278952
# OL 9 must audit any script or executable called by cron as root or by any privileged user.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Audit modifications to /etc/cron.d
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^\s*-w\s+/etc/cron\.d(\s+-p\s*([rx]*w[rx]*a[rx]*|[rx]*a[rx]*w[rx]*))?(\s+(-k\s+|-F\s+key=)\w+)?\s*$' '/etc/audit/audit.rules' &>/dev/null
}
# Audit modifications to /var/spool/cron
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^\s*-w\s+/var/spool/cron(\s+-p\s*([rx]*w[rx]*a[rx]*|[rx]*a[rx]*w[rx]*))?(\s+(-k\s+|-F\s+key=)\w+)?\s*$' '/etc/audit/audit.rules' &>/dev/null
}

if ( test_1 && test_2 ); 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.ol9os:def:278952

if grep -q "^\\s*-w\\s+/etc/cron\\.d(\\s+-p\\s*([rx]*w[rx]*a[rx]*|[rx]*a[rx]*w[rx]*))?(\\s+(-k\\s+|-F\\s+key=)\\w+)?\\s*$" /etc/audit/audit.rules && \
   grep -q "^\\s*-w\\s+/var/spool/cron(\\s+-p\\s*([rx]*w[rx]*a[rx]*|[rx]*a[rx]*w[rx]*))?(\\s+(-k\\s+|-F\\s+key=)\\w+)?\\s*$" /etc/audit/audit.rules
then
    echo "PASS"
    exit 0
else
    echo "FAIL"
    exit 1
fi

Remediation

Configure OL 9 to audit the execution of any system call made by cron as root or as any privileged user.

Add or update the following file system rules to "/etc/audit/rules.d/audit.rules":

auditctl -w /etc/cron.d/ -p wa -k cronjobs
auditctl -w /var/spool/cron/ -p wa -k cronjobs

To load the rules to the kernel immediately, use the following command:

$ sudo augenrules --load