[CVE-2022-32209] Possible XSS Vulnerability in Rails::Html::Sanitizer

Security Announcements
1

There 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: ALL Not affected: NONE Fixed Versions: v1.4.3

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. This may be done via application configuration:

# In config/application.rb
config.action_view.sanitized_allowed_tags = ["select", "style"]

see Configuring Rails Applications — Ruby on Rails Guides

Or it may be done with a :tags option to the Action View helper sanitize:

<%= sanitize @comment.body, tags: ["select", "style"] %>

see ActionView::Helpers::SanitizeHelper

Or it may be done with Rails::Html::SafeListSanitizer directly:

# class-level option
Rails::Html::SafeListSanitizer.allowed_tags = ["select", "style"]

or

# instance-level option
Rails::Html::SafeListSanitizer.new.sanitize(@article.body, tags: ["select", "style"])

All users overriding the allowed tags by any of the above mechanisms to include both “select” and “style” should either upgrade or use one of the workarounds immediately.

Releases

The FIXED releases are available at the normal locations.

Workarounds

Remove either select or style from the overridden allowed tags.

Credits

This vulnerability was responsibly reported by windshock.

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