mcp-server-semgrep/semgrep-rules/ruby/lang/security/insufficient-rsa-key-size.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: insufficient-rsa-key-size
  message: >-
    The RSA key size $SIZE is insufficent by NIST standards. It is recommended to use a key length of
    2048 or higher.
  languages: [ruby]
  severity: WARNING
  metadata:
    technology:
    - ruby
    category: security
    references:
    - https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-57Pt3r1.pdf
    cwe:
    - 'CWE-326: Inadequate Encryption Strength'
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    subcategory:
    - vuln
    likelihood: HIGH
    impact: MEDIUM
    confidence: HIGH
  patterns:
  - pattern-either:
    - pattern: OpenSSL::PKey::RSA.generate($SIZE,...)
    - pattern: OpenSSL::PKey::RSA.new($SIZE, ...)
    - patterns:
      - pattern-either:
        - patterns:
          - pattern-inside: |
              $ASSIGN = $SIZE
              ...
          - pattern-either:
            - pattern: OpenSSL::PKey::RSA.new($ASSIGN, ...)
            - pattern: OpenSSL::PKey::RSA.generate($ASSIGN, ...)
        - patterns:
          - pattern-inside: |
              def $METHOD1(...)
              ...
              $ASSIGN = $SIZE
              ...
              end
              ...
          - pattern-either:
            - pattern: OpenSSL::PKey::RSA.new($ASSIGN, ...)
            - pattern: OpenSSL::PKey::RSA.generate($ASSIGN, ...)
  - metavariable-comparison:
      metavariable: $SIZE
      comparison: $SIZE < 2048