{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/14955?format=json","vulnerability_id":"VCID-cphr-tdzs-x7ar","summary":"rails-html-sanitize has XSS vulnerability with certain configurations\n## Summary\n\nThere is a possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer 1.6.0 when used with Rails >= 7.1.0 and Nokogiri < 1.15.7, or 1.16.x < 1.16.8.\n\n* Versions affected: 1.6.0\n* Not affected: < 1.6.0\n* Fixed versions: 1.6.1\n\nPlease note that the fix in v1.6.1 is to update the dependency on Nokogiri to 1.15.7 or >= 1.16.8.\n\n\n## Impact\n\nA possible XSS vulnerability with certain configurations of Rails::HTML::Sanitizer may allow an attacker to inject content if HTML5 sanitization is enabled and the application developer has overridden the sanitizer's allowed tags in either of the following ways:\n\n* allow both \"math\" and \"style\" elements\n* or allow both \"svg\" and \"style\" elements\n\nCode is only impacted if Rails is configured to use HTML5 sanitization, please see documentation for [`config.action_view.sanitizer_vendor`](https://guides.rubyonrails.org/configuring.html#config-action-view-sanitizer-vendor) and [`config.action_text.sanitizer_vendor`](https://guides.rubyonrails.org/configuring.html#config-action-text-sanitizer-vendor) for more information on these configuration options.\n\nCode is only impacted if allowed tags are being overridden. Applications may be doing this in a few different ways:\n\n1. using application configuration to configure Action View sanitizers' allowed tags:\n\n  ```ruby\n  # In config/application.rb\n  config.action_view.sanitized_allowed_tags = [\"math\", \"style\"]\n  # or\n  config.action_view.sanitized_allowed_tags = [\"svg\", \"style\"]\n  ```\n\n  see https://guides.rubyonrails.org/configuring.html#configuring-action-view\n\n2. using a `:tags` option to the Action View helper `sanitize`:\n\n  ```\n  <%= sanitize @comment.body, tags: [\"math\", \"style\"] %>\n  <%# or %>\n  <%= sanitize @comment.body, tags: [\"svg\", \"style\"] %>\n  ```\n\n  see https://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-sanitize\n\n3. setting Rails::HTML5::SafeListSanitizer class attribute `allowed_tags`:\n\n  ```ruby\n  # class-level option\n  Rails::HTML5::SafeListSanitizer.allowed_tags = [\"math\", \"style\"]\n  # or\n  Rails::HTML5::SafeListSanitizer.allowed_tags = [\"svg\", \"style\"]\n  ```\n\n  (note that this class may also be referenced as `Rails::Html::SafeListSanitizer`)\n\n4. using a `:tags` options to the Rails::HTML5::SafeListSanitizer instance method `sanitize`:\n\n  ```ruby\n  # instance-level option\n  Rails::HTML5::SafeListSanitizer.new.sanitize(@article.body, tags: [\"math\", \"style\"])\n  # or\n  Rails::HTML5::SafeListSanitizer.new.sanitize(@article.body, tags: [\"svg\", \"style\"])\n  ```\n\n  (note that this class may also be referenced as `Rails::Html::SafeListSanitizer`)\n\n5. setting ActionText::ContentHelper module attribute `allowed_tags`:\n\n  ```ruby\n  ActionText::ContentHelper.allowed_tags = [\"math\", \"style\"]\n  # or\n  ActionText::ContentHelper.allowed_tags = [\"svg\", \"style\"]\n  ```\n\nAll users overriding the allowed tags by any of the above mechanisms to include ((\"math\" or \"svg\") and \"style\") should either upgrade or use one of the workarounds.\n\n\n## Workarounds\n\nAny one of the following actions will work around this issue:\n\n- Remove \"style\" from the overridden allowed tags,\n- Or, remove \"math\" and \"svg\" from the overridden allowed tags,\n- Or, downgrade sanitization to HTML4 (see documentation for [`config.action_view.sanitizer_vendor`](https://guides.rubyonrails.org/configuring.html#config-action-view-sanitizer-vendor) and [`config.action_text.sanitizer_vendor`](https://guides.rubyonrails.org/configuring.html#config-action-text-sanitizer-vendor) for more information)\n- Or, independently upgrade Nokogiri to v1.15.7 or >= 1.16.8.\n\n\n## References\n\n- [CWE - CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (4.9)](https://cwe.mitre.org/data/definitions/79.html)\n- Original report: https://hackerone.com/reports/2503220\n\n\n## Credit\n\nThis vulnerability was responsibly reported by So Sakaguchi ([mokusou](https://hackerone.com/mokusou)) and 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