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CIS Ubuntu 14.04 LTS - 2.2.13 Ensure HTTP Proxy Server is not enabled

DevOps & Security
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Verify that Squid HTTP proxy server is disabled when not required

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How to use this skill

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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-v210-2-2-13/SKILL.md

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2.2.13 Ensure HTTP Proxy Server is not enabled (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

Squid is a standard proxy server used in many distributions and environments.

Rationale

If there is no need for a proxy server, it is recommended that the squid proxy be deleted to reduce the potential attack surface.

Audit Procedure

Ensure no start conditions listed for squid3:

initctl show-config squid3

Verify the output shows squid3 with no start conditions.

Expected Result

The squid3 service should have no start conditions listed.

Remediation

Remove or comment out start lines in /etc/init/squid3.conf:

#start on runlevel [2345]

Default Value

Squid proxy server is not enabled by default.

References

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

Profile

  • Level 1 - Server
  • Level 1 - Workstation