mcp-server-semgrep/semgrep-rules/python/pycryptodome/security/insufficient-dsa-key-size.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: insufficient-dsa-key-size
  message: >-
    Detected an insufficient key size for DSA. NIST recommends
    a key size of 2048 or higher.
  metadata:
    cwe:
    - 'CWE-326: Inadequate Encryption Strength'
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    source-rule-url: https://github.com/PyCQA/bandit/blob/b1411bfb43795d3ffd268bef17a839dee954c2b1/bandit/plugins/weak_cryptographic_key.py
    references:
    - https://www.pycryptodome.org/src/public_key/dsa
    - https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57pt1r5.pdf
    category: security
    technology:
    - pycryptodome
    subcategory:
    - vuln
    likelihood: LOW
    impact: MEDIUM
    confidence: HIGH
    functional-categories:
      - crypto::search::key-length::pycryptodome
      - crypto::search::key-length::pycryptodomex
  options:
    symbolic_propagation: true
  languages: [python]
  severity: WARNING
  patterns:
  - pattern-either:
    - pattern: Crypto.PublicKey.DSA.generate(..., bits=$SIZE, ...)
    - pattern: Crypto.PublicKey.DSA.generate($SIZE, ...)
    - pattern: Cryptodome.PublicKey.DSA.generate(..., bits=$SIZE, ...)
    - pattern: Cryptodome.PublicKey.DSA.generate($SIZE, ...)
  - metavariable-comparison:
      metavariable: $SIZE
      comparison: $SIZE < 2048