cis-ubuntu2004-v300-1-1-2-7-4

name	cis-ubuntu2004-v300-1-1-2-7-4
description	Ensure noexec option set on /var/log/audit partition
category	cis-storage
version	3.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-20.04","filesystem","partition","var-log-audit"]
cis_id	1.1.2.7.4
cis_benchmark	CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure noexec option set on /var/log/audit partition

Profile

• Level 1 - Server
• Level 1 - Workstation

Description

The noexec mount option specifies that the filesystem cannot contain executable binaries.

Rationale

Since the /var/log/audit filesystem is only intended for audit logs, set this option to ensure that users cannot run executable binaries from /var/log/audit.

Audit

• IF - a separate partition exists for /var/log/audit, verify that the noexec option is set.

Run the following command to verify that the noexec mount option is set.

Command Line

# findmnt -kn /var/log/audit | grep -v noexec

Expected Result

Nothing should be returned

Remediation

• IF - a separate partition exists for /var/log/audit.

Edit the /etc/fstab file and add noexec to the fourth field (mounting options) for the /var/log/audit partition.

Command Line

Example:

<device> /var/log/audit <fstype> defaults,rw,nosuid,nodev,noexec,relatime 0 0

Run the following command to remount /var/log/audit with the configured options:

# mount -o remount /var/log/audit

References

1. See the fstab(5) manual page for more information.
2. NIST SP 800-53 Rev. 5: AC-3, MP-2
3. NIST SP 800-53 Revision 5 :: CM-7 (2)
4. STIG ID: RHEL-08-040131 | RULE ID: SV-230519r958804 | CAT II
5. STIG ID: RHEL-09-231165 | RULE ID: SV-257874r958804 | CAT II

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists Configure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications.	●	●	●
v7	14.6 Protect Information through Access Control Lists Protect all information stored on systems with file system, network share, claims, application, or database specific access control lists. These controls will enforce the principle that only authorized individuals should have access to the information based on their need to access the information as a part of their responsibilities.