mcp-server-semgrep/semgrep-rules/javascript/aws-lambda/security/dynamodb-request-object.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: dynamodb-request-object
  message: >-
    Detected DynamoDB query params that are tainted by `$EVENT` object. This could lead to NoSQL injection
    if the variable is user-controlled
    and not properly sanitized. Explicitly assign query params instead of passing data from `$EVENT` directly
    to DynamoDB client.
  metadata:
    cwe:
    - 'CWE-943: Improper Neutralization of Special Elements in Data Query Logic'
    owasp:
    - A01:2017 - Injection
    category: security
    technology:
    - javascript
    - aws-lambda
    - dynamodb
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: HIGH
    confidence: MEDIUM
    references:
    - https://owasp.org/Top10/A03_2021-Injection
  languages:
  - javascript
  - typescript
  severity: ERROR
  mode: taint
  pattern-sources:
  - patterns:
    - pattern: $EVENT
    - pattern-either:
      - pattern-inside: |
          exports.handler = function ($EVENT, ...) {
            ...
          }
      - pattern-inside: |
          function $FUNC ($EVENT, ...) {...}
          ...
          exports.handler = $FUNC
      - pattern-inside: |
          $FUNC = function ($EVENT, ...) {...}
          ...
          exports.handler = $FUNC
  pattern-sinks:
  - patterns:
    - focus-metavariable: $SINK
    - pattern: |
        $DC.$METHOD($SINK, ...)
    - metavariable-regex:
        metavariable: $METHOD
        regex: (query|send|scan|delete|put|transactWrite|update|batchExecuteStatement|executeStatement|executeTransaction|transactWriteItems)
    - pattern-either:
      - pattern-inside: |
          $DC = new $AWS.DocumentClient(...);
          ...
      - pattern-inside: |
          $DC = new $AWS.DynamoDB(...);
          ...
      - pattern-inside: |
          $DC = new DynamoDBClient(...);
          ...
      - pattern-inside: |
          $DC = DynamoDBDocumentClient.from(...);
          ...
  pattern-sanitizers:
  - patterns:
    - pattern: |
        {...}