mcp-server-semgrep/semgrep-rules/ruby/aws-lambda/security/tainted-sql-string.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: tainted-sql-string
  languages: [ruby]
  severity: ERROR
  message: >-
    Detected user input used to manually construct a SQL string. This is usually
    bad practice because manual construction could accidentally result in a SQL
    injection. An attacker could use a SQL injection to steal or modify contents
    of the database. Instead, use a parameterized query which is available
    by default in most database engines. Alternatively, consider using an
    object-relational mapper (ORM) such as Sequelize which will protect your queries.
  metadata:
    references:
    - https://rorsecurity.info/portfolio/ruby-on-rails-sql-injection-cheat-sheet
    category: security
    owasp:
    - A01:2017 - Injection
    - A03:2021 - Injection
    cwe:
    - "CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')"
    technology:
    - aws-lambda
    cwe2022-top25: true
    cwe2021-top25: true
    subcategory:
    - vuln
    likelihood: MEDIUM
    impact: HIGH
    confidence: MEDIUM
  mode: taint
  pattern-sources:
  - patterns:
    - pattern: event
    - pattern-inside: |
        def $HANDLER(event, context)
          ...
        end
  pattern-sinks:
  - patterns:
    - pattern-either:
      - patterns:
        - pattern: |
            "...#{...}..."
        - pattern-regex: (?i)(select|delete|insert|create|update|alter|drop)\b|\w+\s*!?[<>=].*
      - patterns:
        - pattern-either:
          - pattern: Kernel::sprintf("$SQLSTR", ...)
          - pattern: |
              "$SQLSTR" + $EXPR
          - pattern: |
              "$SQLSTR" % $EXPR
        - metavariable-regex:
            metavariable: $SQLSTR
            regex: (?i)(select|delete|insert|create|update|alter|drop)\b|\w+\s*!?[<>=].*
    - pattern-not-inside: |
        puts(...)