cis-ubuntu1804-v220-2-2-11

DevOps & Security

Ensure Samba is not installed

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_18.04_LTS_Benchmark_v2.2.0/cis-ubuntu1804-v220-2-2-11/SKILL.md

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2.2.11 Ensure Samba is not installed (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. 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 should be deleted to reduce the potential attack surface.

Audit Procedure

Command Line

Run the following command to verify samba is not installed:

# dpkg-query -s samba &>/dev/null && echo "samba is installed"

Nothing should be returned.

Expected Result

No output (empty result).

Remediation

Command Line

Run the following command to remove samba:

# apt purge samba

References

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

CIS Controls

v8: 4.8 - Uninstall or Disable Unnecessary Services on Enterprise Assets and Software
v7: 9.2 - Ensure Only Approved Ports, Protocols and Services Are Running