mcp-server-semgrep/semgrep-rules/python/lang/security/audit/insecure-transport/ssl/no-set-ciphers.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: no-set-ciphers
  pattern: $CONTEXT.set_ciphers(...)
  message: >-
    The 'ssl' module disables insecure cipher suites by default. Therefore,
    use of 'set_ciphers()' should only be used when you have very specialized
    requirements. Otherwise, you risk lowering the security of the SSL channel.
  metadata:
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    cwe:
    - 'CWE-326: Inadequate Encryption Strength'
    asvs:
      section: V9 Communications Verification Requirements
      control_id: 9.1.3 Weak TLS
      control_url: https://github.com/OWASP/ASVS/blob/master/4.0/en/0x17-V9-Communications.md#v91-client-communications-security-requirements
      version: '4'
    references:
    - https://docs.python.org/3/library/ssl.html#cipher-selection
    - https://docs.python.org/3/library/ssl.html#ssl.SSLContext.set_ciphers
    category: security
    technology:
    - ssl
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
  languages: [python]
  severity: WARNING