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CIS Ubuntu 14.04 LTS - 6.1.10 Ensure no world writable files exist

DevOps & Security
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Find and remediate world writable files across all local filesystems

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How to use this skill

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Prompt to paste
I want to install this Agent Skill for this project in Codex.

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-v210-6-1-10/SKILL.md

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First, summarize what it does, its dependencies, license status if identifiable, and any risks. Show the exact files you propose to add under .agents/skills/cis-ubuntu-14-04-lts-6-1-10-ensure-no-world-writable-files-exist/. Do not write files or run scripts until I approve.

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Copying this prompt does not install or run the skill. Review third-party files before use. Codex skill guide

6.1.10 Ensure no world writable files exist (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

Unix-based systems support variable settings to control access to files. World writable files are the least secure. See the chmod(2) man page for more information.

Rationale

Data in world-writable files can be modified and compromised by any user on the system. World writable files may also indicate an incorrectly written script or program that could potentially be the cause of a larger compromise to the system's integrity.

Audit Procedure

Run the following command and verify no files are returned:

df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -type f -perm -0002

The command above only searches local filesystems, there may still be compromised items on network mounted partitions. Additionally the --local option to df is not universal to all versions, it can be omitted to search all filesystems on a system including network mounted filesystems or the following command can be run manually for each partition:

find <partition> -xdev -type f -perm -0002

Expected Result

No output should be returned.

Remediation

Removing write access for the "other" category (chmod o-w <filename>) is advisable, but always consult relevant vendor documentation to avoid breaking any application dependencies on a given file.

Default Value

Not applicable.

References

None

CIS Controls

14 Controlled Access Based on the Need to Know - Controlled Access Based on the Need to Know

Profile

  • Level 1