cis-ubuntu2004-v300-2-1-14

DevOps & Security

Ensure samba file server 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-v300-2-1-14/SKILL.md

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2.1.14 Ensure samba file server services are not in use (Automated)

Profile

Level 1 - Server
Level 1 - Workstation

Description

The Samba daemon allows system administrators to configure their Linux systems to share file systems and directories with Windows desktops. Samba will advertise the file systems and directories via the Server Message Block (SMB) protocol.

Rationale

If there is no need to share file systems and directories with Windows systems, then Samba should be disabled to reduce the remote attack surface.

Audit Procedure

Command Line

Run the following command to verify samba is not installed:

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

If installed, run:

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

Verify the service is not enabled and not active.

Expected Result

samba 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 samba:

# systemctl stop smbd.service
# systemctl mask smbd.service
# apt purge samba

Default Value

samba is not installed by default.

References

NIST SP 800-53 Rev. 5: CM-6, CM-7

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software		x	x
v7	9.2 Ensure Only Approved Ports, Protocols and Services Are Running		x	x

MITRE ATT&CK Mappings: T1005, T1039, T1083, T1135, T1203, T1210, T1543, T1543.002 | TA0008