mcp-server-semgrep/semgrep-rules/python/lang/security/audit/system-wildcard-detected.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: system-wildcard-detected
  patterns:
  - pattern-either:
    - pattern-inside: os.system("...")
    - pattern-inside: os.popen("...")
    - pattern-inside: os.popen2("...")
    - pattern-inside: os.popen3("...")
    - pattern-inside: os.popen4("...")
    - pattern-inside: subprocess.$W(..., shell=True, ...)
  - pattern-regex: (tar|chmod|chown|rsync)(.*?)\*
  message: >-
    Detected use of the wildcard character in a system call that spawns a shell.
    This subjects the wildcard to normal shell expansion, which can have unintended
    consequences
    if there exist any non-standard file names. Consider a file named '-e sh script.sh'
    -- this
    will execute a script when 'rsync' is called. See
    https://www.defensecode.com/public/DefenseCode_Unix_WildCards_Gone_Wild.txt
    for more information.
  metadata:
    cwe:
    - 'CWE-155: Improper Neutralization of Wildcards or Matching Symbols'
    owasp: 'A01:2017 - Injection'
    source-url-open: https://github.com/PyCQA/bandit/blob/b1411bfb43795d3ffd268bef17a839dee954c2b1/bandit/plugins/injection_wildcard.py
    references:
    - https://www.defensecode.com/public/DefenseCode_Unix_WildCards_Gone_Wild.txt
    category: security
    technology:
    - python
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages: [python]
  severity: WARNING