mcp-server-semgrep/semgrep-rules/yaml/github-actions/security/allowed-unsecure-commands.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: allowed-unsecure-commands
  languages: [yaml]
  severity: WARNING
  message: >-
    The environment variable `ACTIONS_ALLOW_UNSECURE_COMMANDS` grants this workflow permissions
    to use the `set-env` and `add-path` commands. There is a vulnerability in these commands
    that could result in environment variables being modified by an attacker. Depending on the
    use of the environment variable, this could enable an attacker to, at worst,
    modify the system path to run a different command than intended, resulting in arbitrary
    code execution. This could result in stolen code or secrets.
    Don't use `ACTIONS_ALLOW_UNSECURE_COMMANDS`. Instead, use Environment Files. See
    https://github.com/actions/toolkit/blob/main/docs/commands.md#environment-files for
    more information.
  metadata:
    cwe:
    - 'CWE-749: Exposed Dangerous Method or Function'
    owasp: 'A06:2017 - Security Misconfiguration'
    references:
    - https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
    - https://github.com/actions/toolkit/security/advisories/GHSA-mfwh-5m23-j46w
    - https://github.com/actions/toolkit/blob/main/docs/commands.md#environment-files
    category: security
    technology:
    - github-actions
    subcategory:
    - vuln
    likelihood: LOW
    impact: MEDIUM
    confidence: MEDIUM
  patterns:
  - pattern-either:
    - patterns:
      - pattern-inside: '{env: ...}'
      - pattern: 'ACTIONS_ALLOW_UNSECURE_COMMANDS: true'