Headline
CVE-2022-23520: Possible XSS vulnerability with certain configurations of rails-html-sanitizer
rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Prior to version 1.4.4, there is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer due to an incomplete fix of CVE-2022-32209. Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer’s allowed tags to allow both “select” and “style” elements. Code is only impacted if allowed tags are being overridden. This issue is patched in version 1.4.4. All users overriding the allowed tags to include both “select” and “style” should either upgrade or use this workaround: Remove either “select” or “style” from the overridden allowed tags. NOTE: Code is not impacted if allowed tags are overridden using either the :tags option to the Action View helper method sanitize or the :tags option to the instance method SafeListSanitizer#sanitize.
Summary
There is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer. This is due to an incomplete fix of CVE-2022-32209.
- Versions affected: ALL
- Not affected: NONE
- Fixed versions: 1.4.4
Impact
A possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer’s allowed tags to allow both “select” and “style” elements.
Code is only impacted if allowed tags are being overridden using either of the following two mechanisms:
- Using the Rails configuration config.action_view.sanitized_allow_tags=:
# In config/application.rb config.action_view.sanitized_allowed_tags = ["select", “style”]
(see https://guides.rubyonrails.org/configuring.html#configuring-action-view)
- Using the class method Rails::Html::SafeListSanitizer.allowed_tags=:
# class-level option Rails::Html::SafeListSanitizer.allowed_tags = ["select", “style”]
All users overriding the allowed tags by either of the above mechanisms to include both “select” and “style” should either upgrade or use one of the workarounds immediately.
NOTE: Code is not impacted if allowed tags are overridden using either of the following mechanisms:
- the :tags option to the Action View helper method sanitize.
- the :tags option to the instance method SafeListSanitizer#sanitize.
Workarounds
Remove either “select” or “style” from the overridden allowed tags.
References
- CWE - CWE-79: Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’) (4.9)
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-32209
- https://hackerone.com/reports/1654310
Credit
This vulnerability was responsibly reported by Dominic Breuker.
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## Summary There is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer. This is due to an incomplete fix of CVE-2022-32209. - Versions affected: ALL - Not affected: NONE - Fixed versions: 1.4.4 ## Impact A possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer's allowed tags to allow both "select" and "style" elements. Code is only impacted if allowed tags are being overridden using either of the following two mechanisms: 1. Using the Rails configuration `config.action_view.sanitized_allow_tags=`: ```ruby # In config/application.rb config.action_view.sanitized_allowed_tags = ["select", "style"] ``` (see https://guides.rubyonrails.org/configuring.html#configuring-action-view) 2. Using the class method `Rails::Html::SafeListSanitizer.allowed_tags=`: ```ruby # class-level option Rails::Html::SafeListSanitizer...
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Versions of Rails::Html::Sanitizer prior to version 1.4.3 are vulnerable to XSS with certain configurations of Rails::Html::Sanitizer which allows an attacker to inject content when the application developer has overridden the sanitizer's allowed tags to allow both `select` and `style` elements. Code is only impacted if allowed tags are being overridden. This may be done via application configuration: ```ruby# In config/application.rbconfig.action_view.sanitized_allowed_tags = ["select", "style"]``` see https://guides.rubyonrails.org/configuring.html#configuring-action-view Or it may be done with a `:tags` option to the Action View helper `sanitize`: ```<%= sanitize @comment.body, tags: ["select", "style"] %>``` see https://api.rubyonrails.org/classes/ActionView/Helpers/SanitizeHelper.html#method-i-sanitize It may also be done with Rails::Html::SafeListSanitizer directly: ```ruby# class-level optionRails::Html::SafeListSanitizer.allowed_tags = ["select", "style"]``` or with ...
# Possible XSS Vulnerability in Rails::Html::SanitizerThere is a possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer.This vulnerability has been assigned the CVE identifier CVE-2022-32209.Versions Affected: ALLNot affected: NONEFixed Versions: v1.4.3## ImpactA possible XSS vulnerability with certain configurations of Rails::Html::Sanitizer may allow an attacker to inject content if the application developer has overridden the sanitizer's allowed tags to allow both `select` and `style` elements.Code is only impacted if allowed tags are being overridden. This may be done via application configuration:```ruby# In config/application.rbconfig.action_view.sanitized_allowed_tags = ["select", "style"]```see https://guides.rubyonrails.org/configuring.html#configuring-action-viewOr it may be done with a `:tags` option to the Action View helper `sanitize`:```<%= sanitize @comment.body, tags: ["select", "style"] %>```see https://api.rubyonrails.org/classes/ActionView/H...