CVE-2020-4054

Published: 16 June 2020

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.

Priority

Medium

CVSS 3 base score: 7.3

Status

Package Release Status
ruby-sanitize
Launchpad, Ubuntu, Debian 		Upstream Needs triage

Ubuntu 20.10 (Groovy Gorilla) Not vulnerable
(4.6.6-2.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (4.6.6-2.1~0.20.04.1)
Ubuntu 18.04 LTS (Bionic Beaver) Needs triage

Ubuntu 16.04 LTS (Xenial Xerus) Needs triage

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

References

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Further reading