SV-27347r1: Cron and crontab directories must be group-owned by root, sys, or bin. | SOLARIS 9 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

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Assessment Title

Rule Text

Cron and crontab directories must be group-owned by root, sys, or bin.

Description

Discussion Text

To protect the integrity of scheduled system jobs and to prevent malicious modification to these jobs, crontab files must be secured. Failure to give group-ownership of cron or crontab directories to a system group provides the designated group and unauthorized users with the potential to access sensitive information or change the system configuration which could weaken the system's security posture.

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 Solaris 9 Sparc DISA DPMS Target Solaris 9 Sparc 21

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.solaris11:def:183
# Cron and crontab directories must be group-owned by root, sys, or bin.
# 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/crontabs is root
# file_object (file_test)
test_1() {
  [ "$(stat -c '%g' '/var/spool/cron/crontabs')" -eq 0 ]
}
# Test existence of group sys
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -Pq '^sys:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /var/spool/cron/crontabs is sys
# file_object (file_test)
test_3() {
  [ "$(stat -c '%g' '/var/spool/cron/crontabs')" = "$(sed -En 's/^sys:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}
# Test existence of group bin
# textfilecontent54_object (textfilecontent54_test)
test_4() {
  grep -Pq '^bin:[^:]*:([0-9]+):' '/etc/group' &>/dev/null
}
# Test group of /var/spool/cron/crontabs is bin
# file_object (file_test)
test_5() {
  [ "$(stat -c '%g' '/var/spool/cron/crontabs')" = "$(sed -En 's/^bin:[^:]*:([0-9]+):/\1/p' '/etc/group')" ]
}

if ( test_1 || ( test_2 && test_3 ) || ( test_4 && test_5 ) ); 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.solaris11:def:183

if [ ! -d "/var/spool/cron/crontabs" ]; then echo "PASS"; exit 0; fi
if [ "$(stat -c '%G' /var/spool/cron/crontabs)" = "root" ] || [ "$(getent group | grep -q "^sys:[^:]*:[0-9]+:" && echo "PASS" || echo "FAIL")" ] || [ "$(getent group | grep -q "^bin:[^:]*:[0-9]+:" && echo "PASS" || echo "FAIL")" ]; then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Change the group owner of the crontab directories to root, sys, or bin.

Procedure:
# chgrp root /var/spool/cron/crontabs