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CIS Ubuntu 14.04 LTS - 2.1.9 Ensure tftp server is not enabled

DevOps & Security
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Verify that tftp inetd service is disabled to prevent unauthenticated file transfers

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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-v210-2-1-9/SKILL.md

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2.1.9 Ensure tftp server is not enabled (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

Trivial File Transfer Protocol (TFTP) is a simple file transfer protocol, typically used to automatically transfer configuration or boot machines from a boot server. The packages tftpd and atftp are both used to define and support a TFTP server.

Rationale

TFTP does not support authentication nor does it ensure the confidentiality or integrity of data. It is recommended that TFTP be removed, unless there is a specific need for TFTP. In that case, extreme caution must be used when configuring the services.

Audit Procedure

Verify the tftp service is not enabled. Run the following command and verify results are as indicated:

grep -R "^tftp" /etc/inetd.*

No results should be returned.

Check /etc/xinetd.conf and /etc/xinetd.d/* and verify all tftp services have disable = yes set.

Expected Result

No output should be returned from the grep command. All tftp services in xinetd should have disable = yes.

Remediation

Comment out or remove any lines starting with tftp from /etc/inetd.conf and /etc/inetd.d/*.

Set disable = yes on all tftp services in /etc/xinetd.conf and /etc/xinetd.d/*.

Default Value

tftp services are not enabled by default.

References

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

Profile

  • Level 1 - Server
  • Level 1 - Workstation