SV-257827r1044892: RHEL 9 must not have the sendmail package installed. | Red Hat Enterprise Linux 9 STIG SCAP Benchmark

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Assessment Title

Rule Text

RHEL 9 must not have the sendmail package installed.

Description

Discussion Text

The sendmail software was not developed with security in mind, and its design prevents it from being effectively contained by SELinux. Postfix must be used instead. Satisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000095-GPOS-00049

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381

References

DPMS Target Red Hat Enterprise Linux 9 DISA DPMS Target Red Hat Enterprise Linux 9 5551

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.rhel9os:def:257827
# RHEL 9 must not have the sendmail package installed.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# package sendmail is not installed
# rpminfo_object (rpminfo_test)
test_1() {
  ! ( rpm -q --quiet 'sendmail' &>/dev/null )
}

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
# OVAL definition: oval:mil.disa.stig.rhel9os:def:257827

if ! command -v rpm &> /dev/null; then
  echo "FAIL"
  exit 1
fi

if rpm -q sendmail &> /dev/null; then
  echo "FAIL"
  exit 1
fi

echo "PASS"
exit 0

Remediation

Remove the sendmail package with the following command:

$ sudo dnf remove sendmail