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CVE-2022-23520: rails-html-sanitizer could allow injected content

CVE-2022-23520 · published 3 years ago

Summary

If a Rails application changes the list of tags that the sanitizer accepts and includes both the "select" and "style" tags, an attacker could insert harmful code into web pages. This risk is fixed in version 1.4.4 of rails-html-sanitizer. Update to the newer version or remove either the "select" or "style" tag from the custom list to stay safe.

What to do

Update rafael mendonça frança rails-html-sanitizer to version 1.4.4.
Update debian ruby-rails-html-sanitizer to version 1.4.4-1.
Update rubyonrails rails_html_sanitizers to version 1.4.4 or later.

Affected software

Ecosystem	Vendor	Product	Affected versions
rubygems	rafael mendonça frança	rails-html-sanitizer	< 1.4.4 Fix: upgrade to 1.4.4
–	rubyonrails	rails_html_sanitizers	< 1.4.4 `cpe:2.3:a:rubyonrails:rails_html_sanitizers::::::rails::*`
–	debian	debian_linux	10.0 `cpe:2.3:o:debian:debian_linux:10.0:::::::*`
Ubuntu:16.04:LTS	canonical	ruby-rails-html-sanitizer	All versions
Debian:12	debian	ruby-rails-html-sanitizer	< 1.4.4-1 Fix: upgrade to 1.4.4-1

Original advisory text

rails-html-sanitizer contains an incomplete fix for an XSS vulnerability

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.

References

https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rails-html-sanitize...
https://github.com/advisories/GHSA-rrfc-7g8p-99q8
https://lists.debian.org/debian-lts-announce/2023/09/msg00012.html URL
https://lists.debian.org/debian-lts-announce/2024/09/msg00045.html URL
https://nvd.nist.gov/vuln/detail/CVE-2022-23520 Vendor Advisory
https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-rrfc-7g8p... Third Party Advisory
https://hackerone.com/reports/1654310 Third Party Advisory
https://ubuntu.com/security/CVE-2022-23520 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2022-23520 Third Party Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/23xxx/CVE-2022-23520... Vendor Advisory
https://security-tracker.debian.org/tracker/CVE-2022-23520 Vendor Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit (estimated)
Gives an attacker partial control (estimated)

Severity

6.1 Medium

Exploitation

1% chance of attack within 30 days

Type

CWE-79Cross-site Scripting (XSS)

Timeline

Published14 Dec 2022

Updated4 Nov 2026

First seen6 Mar 2026

Sources

GHSA-rrfc-7g8p-99q8 · GHSA

CVE-2022-23520 · NVD

UBUNTU-CVE-2022-23520 · OSV

CVE-2022-23520 · OSV

DEBIAN-CVE-2022-23520 · OSV

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