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CIS Ubuntu 14.04 LTS - 3.4.1 Ensure TCP Wrappers is installed

DevOps & Security
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Verify that TCP Wrappers is installed for host-based access control

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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-v210-3-4-1/SKILL.md

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3.4.1 Ensure TCP Wrappers is installed (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

TCP Wrappers provides a simple access list and standardized logging method for services capable of supporting it. In the past, services that were called from inetd and xinetd supported the use of tcp wrappers. As inetd and xinetd have been falling in disuse, any service that can support tcp wrappers will have the libwrap.so library attached to it.

Rationale

TCP Wrappers provide a good simple access list mechanism to services that may not have that support built in. It is recommended that all services that can support TCP Wrappers, use it.

Audit Procedure

Run the following command and verify TCP Wrappers is installed:

dpkg -s tcpd

Expected Result

The package tcpd should be installed (status: install ok installed).

Remediation

Run the following command to install TCP Wrappers:

apt-get install tcpd

Default Value

Not installed by default on all systems.

References

  • CIS Controls: 9.2 - Leverage Host-based Firewalls

Profile

  • Level 1 - Server
  • Level 1 - Workstation