mcp-server-semgrep/semgrep-rules/python/django/security/injection/code/user-eval-format-string.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: user-eval-format-string
  message: >-
    Found user data in a call to 'eval'. This is extremely dangerous because
    it can enable an attacker to execute remote code. See
    https://owasp.org/www-community/attacks/Code_Injection for more information.
  metadata:
    cwe:
    - "CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')"
    owasp:
    - A03:2021 - Injection
    references:
    - https://nedbatchelder.com/blog/201206/eval_really_is_dangerous.html
    category: security
    technology:
    - django
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: HIGH
    confidence: MEDIUM
  patterns:
  - pattern-inside: |
      def $F(...):
        ...
  - pattern-either:
    - pattern: eval(..., $STR % request.$W.get(...), ...)
    - pattern: |
        $V = request.$W.get(...)
        ...
        eval(..., $STR % $V, ...)
    - pattern: |
        $V = request.$W.get(...)
        ...
        $S = $STR % $V
        ...
        eval(..., $S, ...)
    - pattern: eval(..., "..." % request.$W(...), ...)
    - pattern: |
        $V = request.$W(...)
        ...
        eval(..., $STR % $V, ...)
    - pattern: |
        $V = request.$W(...)
        ...
        $S = $STR % $V
        ...
        eval(..., $S, ...)
    - pattern: eval(..., $STR % request.$W[...], ...)
    - pattern: |
        $V = request.$W[...]
        ...
        eval(..., $STR % $V, ...)
    - pattern: |
        $V = request.$W[...]
        ...
        $S = $STR % $V
        ...
        eval(..., $S, ...)
    - pattern: eval(..., $STR.format(..., request.$W.get(...), ...), ...)
    - pattern: |
        $V = request.$W.get(...)
        ...
        eval(..., $STR.format(..., $V, ...), ...)
    - pattern: |
        $V = request.$W.get(...)
        ...
        $S = $STR.format(..., $V, ...)
        ...
        eval(..., $S, ...)
    - pattern: eval(..., $STR.format(..., request.$W(...), ...), ...)
    - pattern: |
        $V = request.$W(...)
        ...
        eval(..., $STR.format(..., $V, ...), ...)
    - pattern: |
        $V = request.$W(...)
        ...
        $S = $STR.format(..., $V, ...)
        ...
        eval(..., $S, ...)
    - pattern: eval(..., $STR.format(..., request.$W[...], ...), ...)
    - pattern: |
        $V = request.$W[...]
        ...
        eval(..., $STR.format(..., $V, ...), ...)
    - pattern: |
        $V = request.$W[...]
        ...
        $S = $STR.format(..., $V, ...)
        ...
        eval(..., $S, ...)
    - pattern: |
        $V = request.$W.get(...)
        ...
        eval(..., f"...{$V}...", ...)
    - pattern: |
        $V = request.$W.get(...)
        ...
        $S = f"...{$V}..."
        ...
        eval(..., $S, ...)
    - pattern: |
        $V = request.$W(...)
        ...
        eval(..., f"...{$V}...", ...)
    - pattern: |
        $V = request.$W(...)
        ...
        $S = f"...{$V}..."
        ...
        eval(..., $S, ...)
    - pattern: |
        $V = request.$W[...]
        ...
        eval(..., f"...{$V}...", ...)
    - pattern: |
        $V = request.$W[...]
        ...
        $S = f"...{$V}..."
        ...
        eval(..., $S, ...)
  languages: [python]
  severity: WARNING