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CIS Ubuntu 14.04 LTS - 2.1.6 Ensure rsh server is not enabled

DevOps & Security
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Verify that rsh, rlogin, and rexec inetd services are disabled

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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-v210-2-1-6/SKILL.md

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2.1.6 Ensure rsh server is not enabled (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

The Berkeley rsh-server (rsh, rlogin, rexec) package contains legacy services that exchange credentials in clear-text.

Rationale

These legacy services contain numerous security exposures and have been replaced with the more secure SSH package.

Audit Procedure

Verify the rsh services are not enabled. Run the following commands and verify results are as indicated:

grep -R "^shell" /etc/inetd.*
grep -R "^login" /etc/inetd.*
grep -R "^exec" /etc/inetd.*

No results should be returned.

Check /etc/xinetd.conf and /etc/xinetd.d/* and verify all rsh, rlogin, and rexec services have disable = yes set.

Expected Result

No output should be returned from any of the grep commands. All rsh, rlogin, and rexec services in xinetd should have disable = yes.

Remediation

Comment out or remove any lines starting with shell, login, or exec from /etc/inetd.conf and /etc/inetd.d/*.

Set disable = yes on all rsh, rlogin, and rexec services in /etc/xinetd.conf and /etc/xinetd.d/*.

Default Value

rsh services are not enabled by default.

References

  • CIS Controls: 3.4 Use Only Secure Channels For Remote System Administration
  • CIS Controls: 9.1 Limit Open Ports, Protocols, and Services

Profile

  • Level 1 - Server
  • Level 1 - Workstation