CVE-2022-23520

Description

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.

How to fix CVE-2022-23520

To remediate CVE-2022-23520, upgrade the affected package to a fixed version below.

• —upgrade to 1.3.0-1+deb11u1 or later
• —upgrade to 1.4.4 or later

Is CVE-2022-23520 being exploited?

Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 1.3.0-1+deb11u1
• from 0, < 1.4.4

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2022-23520
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2022-23520
• PATCHgithub.com/rails/rails-html-sanitizer
• WEBgithub.com/rails/rails-html-sanitizer/security/advisories/GHSA-rrfc-7g8p-99q8