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@cyberstrikeus/cis-ubuntu1204-v110-9-3-6

B

Set SSH IgnoreRhosts to Yes

skillclaude

Install

agr install @cyberstrikeus/cis-ubuntu1204-v110-9-3-6 --target claude

Writes 1 file into .claude/skills/, pinned to git-60ecb891.

  • .claude/skills/cis-ubuntu1204-v110-9-3-6/SKILL.md

Document

name: cis-ubuntu1204-v110-9-3-6 description: "Set SSH IgnoreRhosts to Yes" category: cis-os-hardening version: "1.1.0" author: cyberstrike-official tags: [cis, ubuntu, 12.04, linux, authentication, ssh, rhosts] cis_id: "9.3.6" cis_benchmark: "CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0" tech_stack: [ubuntu, linux] cwe_ids: [] chains_with: [] prerequisites: [] severity_boost: {}

9.3.6 Set SSH IgnoreRhosts to Yes (Scored)

Profile Applicability

  • Level 1

Description

The IgnoreRhosts parameter specifies that .rhosts and .shosts files will not be used in RhostsRSAAuthentication or HostbasedAuthentication.

Rationale

Setting this parameter forces users to enter a password when authenticating with ssh.

Audit Procedure

Using Command Line

To verify the correct SSH setting, run the following command and verify that the output is as shown:

grep "^IgnoreRhosts" /etc/ssh/sshd_config

Expected Result

IgnoreRhosts yes

Remediation

Using Command Line

Edit the /etc/ssh/sshd_config file to set the parameter as follows:

IgnoreRhosts yes

Default Value

IgnoreRhosts yes

References

  • CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 1 - Scored

Trustgrade B

  • passBody integrity

    Whether the stored document is plausibly the kind of file the artifact declares, rather than something fetched by mistake.

  • passType matchnot applicable to this artifact type

    Whether the artifact is really the kind of thing its metadata claims it is.

  • passFreshness

    How long since the source repository was last pushed to.

  • passPrompt injection

    Scans the artifact's own text for instructions aimed at your agent rather than at you.

  • warnLicensecopyleft/unknown — index-and-link only

    Whether the source repository declares an SPDX license permissive enough to redistribute.

How the grade is calculated

Each check contributes 0 points when it passes, 1 when it warns, and 2 when it fails. The total maps to a letter:

  • Aevery check passed
  • Bone warning
  • Ctwo warnings
  • Dprompt injection or body integrity failed, or three warnings
  • Fone of those failed, and something else is wrong

These are automated hygiene checks, not a security audit, and not a dependency or vulnerability scan. A grade of A means nothing was flagged — not that the artifact is safe.

Versions

  • git-60ecb8918d122026-07-31