mcp-server-semgrep/semgrep-rules/javascript/lang/security/audit/unsafe-dynamic-method.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: unsafe-dynamic-method
  message: >-
    Using non-static data to retrieve and run functions from the object is dangerous.
    If the data is user-controlled, it may allow executing arbitrary code.
  metadata:
    owasp:
    - A03:2021 - Injection
    cwe:
    - "CWE-94: Improper Control of Generation of Code ('Code Injection')"
    category: security
    technology:
    - javascript
    cwe2022-top25: true
    subcategory:
    - audit
    likelihood: LOW
    impact: LOW
    confidence: LOW
    references:
    - https://owasp.org/Top10/A03_2021-Injection
  languages:
  - javascript
  - typescript
  severity: WARNING
  patterns:
  - pattern-either:
    - pattern: $OBJ[$X](...)
    - pattern: |
        $Y = $OBJ[$X]
        ...
        $Y(...)
  - metavariable-pattern:
      patterns:
      - pattern-not: |
          "..."
      - pattern-not: |
          ($X: float)
      metavariable: $X
  - pattern-not-inside: |
      for (...) {...}
  - pattern-not-inside: |
      $SMTH.forEach(...)
  - pattern-not-inside: |
      $SMTH.map(...)
  - pattern-not-inside: |
      $SMTH.reduce(...)
  - pattern-not-inside: |
      $SMTH.reduceRight(...)
  - pattern-not-inside: |
      if (<... $OBJ.hasOwnProperty(...) ...>) {
        ...
      }
      ...