SV-204562r991580: The Red Hat Enterprise Linux operating system must audit all uses of the delete_module syscall. | Red Hat Enterprise Linux 7 STIG SCAP Benchmark

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Assessment Title

Rule Text

The Red Hat Enterprise Linux operating system must audit all uses of the delete_module syscall.

Description

Discussion Text

Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. Audit records can be generated from various components within the information system (e.g., module or policy filter). Satisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222

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

IA Controls

NIST SP 800-53

Not mappedCCI-000172V-72189SV-86813

References

DPMS Target Red Hat Enterprise Linux 7 DISA DPMS Target Red Hat Enterprise Linux 7 2899

Checks

DISA STIG (Manual Reference)

Verify the operating system generates audit records when successful/unsuccessful attempts to use the "delete_module" syscall occur. 

Check the auditing rules in "/etc/audit/audit.rules" with the following command:

$ sudo grep -w "delete_module" /etc/audit/audit.rules

-a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=unset -k module-change

-a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=unset -k module-change

If both the "b32" and "b64" audit rules are not defined for the "delete_module" syscall, this is a finding.

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.rhel7:def:658
# The Red Hat Enterprise Linux operating system must audit all uses of the delete_module syscall.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# audit augenrules
# textfilecontent54_object (textfilecontent54_test)
test_1() {
  grep -Pq '^ExecStartPost=\-\/sbin\/augenrules.*$' '/usr/lib/systemd/system/auditd.service' &>/dev/null
}
# audit augenrules 32-bit delete_module
# textfilecontent54_object (textfilecontent54_test)
test_2() {
  grep -rqP --include='*.rules' '^[\s]*-a[\s]+always,exit[\s]+(?:.*-F[\s]+arch=b32[\s]+)(?:.*(-S[\s]+delete_module[\s]+|([\s]+|[,])delete_module([\s]+|[,]))).*(-k[\s]+|-F[\s]+key=)[\S]+[\s]*$' '/etc/audit/rules.d' &>/dev/null
}
# Generic test for x86_64 architecture
# uname_object (uname_test)
test_3() {
  (uname -p) | grep -qxF 'x86_64'
}
# Generic test for ppc64 architecture
# uname_object (uname_test)
test_4() {
  (uname -p) | grep -qxF 'ppc64'
}
# Generic test for ppcle64 architecture
# uname_object (uname_test)
test_5() {
  (uname -p) | grep -qxF 'ppc64le'
}
# audit augenrules 64-bit delete_module
# textfilecontent54_object (textfilecontent54_test)
test_6() {
  grep -rqP --include='*.rules' '^[\s]*-a[\s]+always,exit[\s]+(?:.*-F[\s]+arch=b64[\s]+)(?:.*(-S[\s]+delete_module[\s]+|([\s]+|[,])delete_module([\s]+|[,]))).*(-k[\s]+|-F[\s]+key=)[\S]+[\s]*$' '/etc/audit/rules.d' &>/dev/null
}
# audit auditctl
# textfilecontent54_object (textfilecontent54_test)
test_7() {
  grep -Pq '^ExecStartPost=\-\/sbin\/auditctl.*$' '/usr/lib/systemd/system/auditd.service' &>/dev/null
}
# audit auditctl 32-bit delete_module
# textfilecontent54_object (textfilecontent54_test)
test_8() {
  grep -Pq '^[\s]*-a[\s]+always,exit[\s]+(?:.*-F[\s]+arch=b32[\s]+)(?:.*(-S[\s]+delete_module[\s]+|([\s]+|[,])delete_module([\s]+|[,]))).*(-k[\s]+|-F[\s]+key=)[\S]+[\s]*$' '/etc/audit/audit.rules' &>/dev/null
}
# Generic test for x86_64 architecture
# uname_object (uname_test)
test_9() {
  (uname -p) | grep -qxF 'x86_64'
}
# Generic test for ppc64 architecture
# uname_object (uname_test)
test_10() {
  (uname -p) | grep -qxF 'ppc64'
}
# Generic test for ppcle64 architecture
# uname_object (uname_test)
test_11() {
  (uname -p) | grep -qxF 'ppc64le'
}
# audit auditctl 64-bit delete_module
# textfilecontent54_object (textfilecontent54_test)
test_12() {
  grep -Pq '^[\s]*-a[\s]+always,exit[\s]+(?:.*-F[\s]+arch=b64[\s]+)(?:.*(-S[\s]+delete_module[\s]+|([\s]+|[,])delete_module([\s]+|[,]))).*(-k[\s]+|-F[\s]+key=)[\S]+[\s]*$' '/etc/audit/audit.rules' &>/dev/null
}

if ( ( test_1 && test_2 && ( test_3 || test_4 || test_5 || test_6 ) ) || ( test_7 && test_8 && ( test_9 || test_10 || test_11 || test_12 ) ) ); 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:mil.disa.stig.rhel7:def:658 compliance check

if [ -f /usr/lib/systemd/system/auditd.service ] && grep -q '^ExecStartPost=-\\/sbin\\/augenrules.*$' /usr/lib/systemd/system/auditd.service && [ $(grep -c '/etc/audit/rules.d/*.rules' /etc/audit/rules.d/) -ge 1 ] && ( [ $(grep -c '-a always,exit -F arch=b32 -S delete_module' /etc/audit/rules.d/*.rules) -ge 1 ] || [ $(grep -c '-a always,exit -F arch=b64 -S delete_module' /etc/audit/rules.d/*.rules) -ge 1 ] ); then echo "PASS"; exit 0; else echo "FAIL"; exit 1; fi

Remediation

Configure the operating system to generate audit records when successful/unsuccessful attempts to use the "delete_module" syscall occur. 

Add or update the following rules in "/etc/audit/rules.d/audit.rules": 

-a always,exit -F arch=b32 -S delete_module -F auid>=1000 -F auid!=unset -k module-change

-a always,exit -F arch=b64 -S delete_module -F auid>=1000 -F auid!=unset -k module-change

The audit daemon must be restarted for the changes to take effect.