Bug 1849072 (CVE-2020-4054) - CVE-2020-4054 rubygem-rails-html-sanitizer: XSS via crafted input
Summary: CVE-2020-4054 rubygem-rails-html-sanitizer: XSS via crafted input
Alias: CVE-2020-4054
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1849073
TreeView+ depends on / blocked
Reported: 2020-06-19 14:40 UTC by Dhananjay Arunesh
Modified: 2020-11-03 15:14 UTC (History)
5 users (show)

Fixed In Version:
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Clone Of:
Last Closed: 2020-06-19 17:20:34 UTC

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Description Dhananjay Arunesh 2020-06-19 14:40:12 UTC
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.


Comment 1 Dhananjay Arunesh 2020-06-19 14:40:40 UTC
Created rubygem-rails-html-sanitizer tracking bugs for this issue:

Affects: fedora-all [bug 1849073]

Comment 2 Product Security DevOps Team 2020-06-19 17:20:34 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.

Comment 3 Vít Ondruch 2020-11-03 15:12:52 UTC
I wonder, what was the reason to report this against rails-html-saitizer, because the original description describes something completely different. But possibly, the issue could have been:


However, this was resolved as CVE-2018-3741.

Comment 4 Vít Ondruch 2020-11-03 15:13:24 UTC
This was very likely misreported.

Comment 5 Vít Ondruch 2020-11-03 15:14:24 UTC
Sorry, wanted to change the Fedora tracker ...

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