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CIS Ubuntu 14.04 LTS - 2.2.12 Ensure Samba is not enabled

DevOps & Security
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Verify that Samba SMB file sharing service is disabled when not required

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_14.04_LTS_Benchmark_v2.1.0/cis-ubuntu1404-v210-2-2-12/SKILL.md

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2.2.12 Ensure Samba is not enabled (Scored)

Profile Applicability

  • 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 Small Message Block (SMB) protocol. Windows desktop users will be able to mount these directories and file systems as letter drives on their systems.

Rationale

If there is no need to mount directories and file systems to Windows systems, then this service can be deleted to reduce the potential attack surface.

Audit Procedure

Ensure no start conditions listed for smbd:

initctl show-config smbd

Verify the output shows smbd with no start conditions.

Expected Result

The smbd service should have no start conditions listed.

Remediation

Remove or comment out start lines in /etc/init/smbd.conf:

#start on (local-filesystems and net-device-up)

Default Value

Samba is not enabled by default.

References

  • CIS Controls: 9.1 Limit Open Ports, Protocols, and Services

Profile

  • Level 1 - Server
  • Level 1 - Workstation