CVE-2020-4054

Vulnerability Description

In Sanitize (RubyGem sanitize) greater than or equal to 3.0.0 and less than 5.2.1, there is a cross-site scripting vulnerability. When HTML is sanitized using Sanitize's "relaxed" config, or a custom config that allows certain elements, some content in a math or svg element may not be sanitized correctly even if math and svg are not in the allowlist. You are likely to be vulnerable to this issue if you use Sanitize's relaxed config or a custom config that allows one or more of the following HTML elements: iframe, math, noembed, noframes, noscript, plaintext, script, style, svg, xmp. Using carefully crafted input, an attacker may be able to sneak arbitrary HTML through Sanitize, potentially resulting in XSS (cross-site scripting) or other undesired behavior when that HTML is rendered in a browser. This has been fixed in 5.2.1.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/rgrove/sanitize/commit/a11498de9e283cd457b35ee252983662f7452aPatchThird Party Advisory
• https://github.com/rgrove/sanitize/releases/tag/v5.2.1Release NotesThird Party Advisory
• https://github.com/rgrove/sanitize/security/advisories/GHSA-p4x4-rw2p-8j8mThird Party Advisory
• https://usn.ubuntu.com/4543-1/
• https://www.debian.org/security/2020/dsa-4730
• https://github.com/rgrove/sanitize/commit/a11498de9e283cd457b35ee252983662f7452aPatchThird Party Advisory
• https://github.com/rgrove/sanitize/releases/tag/v5.2.1Release NotesThird Party Advisory
• https://github.com/rgrove/sanitize/security/advisories/GHSA-p4x4-rw2p-8j8mThird Party Advisory
• https://usn.ubuntu.com/4543-1/
• https://www.debian.org/security/2020/dsa-4730