mcp-server-semgrep/semgrep-rules/python/lang/security/audit/insecure-transport/urllib/insecure-urlopener-retrieve-ftp.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: insecure-urlopener-retrieve-ftp
  message: >-
    Detected an insecure transmission channel. 'URLopener.retrieve(...)' is
    being used with 'ftp://'. Use SFTP instead. urllib does not support
    SFTP, so consider using a library which supports SFTP.
  metadata:
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    cwe:
    - 'CWE-319: Cleartext Transmission of Sensitive Information'
    references:
    - https://docs.python.org/3/library/urllib.request.html#urllib.request.URLopener.retrieve
    category: security
    technology:
    - urllib
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  severity: WARNING
  languages: [python]
  pattern-either:
  - pattern: urllib.request.URLopener(...).retrieve("=~/[Ff][Tt][Pp]://.*/", ...)
  - patterns:
    - pattern-inside: |
        $OPENERDIRECTOR = urllib.request.URLopener(...)
        ...
    - pattern: $OPENERDIRECTOR.retrieve("=~/[Ff][Tt][Pp]://.*/", ...)
  - patterns:
    - pattern-inside: |
        $OPENERDIRECTOR = urllib.request.URLopener(...)
        ...
    - pattern: |
        $URL = "=~/[Ff][Tt][Pp]://.*/"
        ...
        $OPENERDIRECTOR.retrieve($URL, ...)
  - pattern: |
      $URL = "=~/[Ff][Tt][Pp]://.*/"
      ...
      urllib.request.URLopener(...).retrieve($URL, ...)
  - patterns:
    - pattern-inside: |
        def $FUNC(..., $URL = "=~/[Ff][Tt][Pp]://.*/", ...):
          ...
    - pattern-either:
      - pattern: urllib.request.URLopener(...).retrieve($URL, ...)
      - patterns:
        - pattern-inside: |
            $OPENERDIRECTOR = urllib.request.URLopener(...)
            ...
        - pattern: $OPENERDIRECTOR.retrieve($URL, ...)