cis-ubuntu2004-v300-2-1-1

DevOps & Security

Ensure autofs services are not in use

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_20.04_LTS_Benchmark_v3.0.0/cis-ubuntu2004-v300-2-1-1/SKILL.md

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2.1.1 Ensure autofs services are not in use (Automated)

Profile

Level 1 - Server
Level 2 - Workstation

Description

autofs allows automatic mounting of devices, typically including CD/DVDs and USB drives.

Rationale

With automounting enabled anyone with physical access could attach a USB drive or disc and have its contents available in system even if they lacked permissions to mount it themselves.

IF - autofs is required, additional steps may be needed to harden the autofs configuration.

Audit Procedure

Command Line

Run the following command to verify autofs is not installed:

# dpkg-query -W -f='${binary:Package}\t${Status}\t${db:Status-Status}\n' autofs

autofs should not be installed. If installed, run:

# systemctl is-enabled autofs.service
# systemctl is-active autofs.service

Verify the service is not enabled and not active.

Expected Result

autofs should not be installed, or if installed, the service should be stopped and masked.

Remediation

Command Line

Run the following commands to stop, mask, and purge autofs:

# systemctl stop autofs.service
# systemctl mask autofs.service
# apt purge autofs

Default Value

autofs is not installed by default.

References

NIST SP 800-53 Rev. 5: SI-3, MP-7
RHEL 8 STIG

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	10.3 Disable Autorun and Autoplay for Removable Media		x	x
v7	8.5 Configure Devices Not To Auto-run Content		x	x

MITRE ATT&CK Mappings: T1068, T1203, T1211, T1212 | TA0008 | M1042