rules:
- id: unquoted-attribute
  message: >-
    Detected a unquoted template variable as an attribute. If unquoted, a
    malicious actor could inject custom JavaScript handlers. To fix this,
    add quotes around the template expression, like this: "<%= expr %>".
  metadata:
    cwe: "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
    owasp: 'A7: Cross-Site Scripting (XSS)'
    references:
    - https://brakemanpro.com/2017/09/08/cross-site-scripting-in-rails#unquoted-attributes
    - https://flask.palletsprojects.com/en/1.1.x/security/#cross-site-scripting-xss
    category: security
    technology:
    - rails
  languages:
  - generic
  paths:
    include:
    - '*.erb'
  severity: WARNING
  patterns:
  - pattern-inside: <$TAG ...>
  - pattern-not-inside: ="..."
  - pattern-not-inside: ='...'
  - pattern: <%= ... %>
  fix-regex:
    regex: <%=(.*?)%>
    replacement: '"<%=\1%>"'