CVE-2022-23518 Improper neutralization of data URIs allows XSS in rails-html-sanitizer

What is CVE-2022-23518?

CVE-2022-23518 is a medium-severity cross-site scripting vulnerability in Debian Debian Linux, published on 14 Dec 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. Versions >= 1.0.3, < 1.4.4 are vulnerable to cross-site scripting via data URIs when used in combination with Loofah >= 2.1.0. This issue is patched in version 1.4.4.

Weakness: CWE-79

Which versions are affected by CVE-2022-23518?

2 open source packages ship an affected version, including rails-html-sanitizer. It affects 3 products.

Products include Debian Debian Linux, Loofah Project Loofah, Rubyonrails Rails Html Sanitizers.

How do I fix CVE-2022-23518?

Upgrade rails-html-sanitizer to 1.4.4 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2022-23518 being exploited?

There is no known exploitation of CVE-2022-23518 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2022-23518, GHSA-mcvf-2q2m-x72m, UBUNTU-CVE-2022-23518.