mcp-server-semgrep/semgrep-rules/python/pyramid/security/direct-use-of-response.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: pyramid-direct-use-of-response
  message: >-
    Detected data rendered directly to the end user via 'Response'.
    This bypasses Pyramid's built-in cross-site scripting
    (XSS) defenses and could result in an XSS vulnerability. Use Pyramid's
    template engines to safely render HTML.
  metadata:
    cwe:
    - "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
    owasp:
    - A07:2017 - Cross-Site Scripting (XSS)
    - A03:2021 - Injection
    category: security
    technology:
    - pyramid
    references:
    - https://owasp.org/Top10/A03_2021-Injection
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - vuln
    likelihood: LOW
    impact: MEDIUM
    confidence: MEDIUM
  languages:
  - python
  severity: ERROR
  mode: taint
  pattern-sources:
  - patterns:
    - pattern-inside: |
        @pyramid.view.view_config( ... )
        def $VIEW($REQ):
          ...
    - pattern: $REQ.$ANYTHING
    - pattern-not: $REQ.dbsession
  pattern-sinks:
  - patterns:
    - pattern-either:
      - pattern: |
          pyramid.request.Response.text($SINK)
      - pattern: |
          pyramid.request.Response($SINK)
      - pattern: |
          $REQ.response.body = $SINK
      - pattern: |
          $REQ.response.text = $SINK
      - pattern: |
          $REQ.response.ubody = $SINK
      - pattern: |
          $REQ.response.unicode_body = $SINK
    - pattern: $SINK