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CIS Ubuntu 14.04 LTS - 2.2.11 Ensure IMAP and POP3 server is not enabled

DevOps & Security
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Verify that dovecot IMAP/POP3 server is disabled when not required

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How to use this skill

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  1. Open your project in Codex.
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  3. Review the proposed files and risks before you approve installation.
Prompt to paste
I want to install this Agent Skill for this project in Codex.

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-v210-2-2-11/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/cis-ubuntu-14-04-lts-2-2-11-ensure-imap-and-pop3-server-is-not-enabled/. Do not write files or run scripts until I approve.

After I approve, install the complete skill folder, including required referenced files, into that project location. Verify it is discoverable, then tell me its actual invocation name and how to use it. Do not claim it is installed until you have verified it.

Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

2.2.11 Ensure IMAP and POP3 server is not enabled (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

dovecot is an open source IMAP and POP3 server for Linux based systems.

Rationale

Unless POP3 and/or IMAP servers are to be provided by this system, it is recommended that the service be deleted to reduce the potential attack surface.

Audit Procedure

Run the following commands to verify no start conditions listed for dovecot:

initctl show-config dovecot

Verify the output shows dovecot with no start conditions.

Expected Result

The dovecot service should have no start conditions listed.

Remediation

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

#start on runlevel [2345]

Note: Several IMAP/POP3 servers exist and can use other service names. exim and cyrus-imap are example services that provide an HTTP server. These and other services should also be audited.

Default Value

dovecot is not enabled by default.

References

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

Profile

  • Level 1 - Server
  • Level 1 - Workstation