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CVE-2020-4054

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4543-1
Posted Sep 27, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4543-1 - Michał Bentkowski discovered that Sanitize did not properly sanitize some math or svg HTML under certain circumstances. A remote attacker could potentially exploit this to conduct cross-site scripting attacks.

tags | advisory, remote, xss
systems | linux, ubuntu
advisories | CVE-2020-4054
SHA-256 | f1ead2388e6d83f5478a5993f2cf6dac7612668cdf51da8b4a35267b82aa59e9
Download | Favorite | View
Debian Security Advisory 4730-1
Posted Jul 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4730-1 - Michal Bentkowski discovered that ruby-sanitize, a whitelist-based HTML sanitizer, is prone to a HTML sanitization bypass vulnerability when using the "relaxed" or a custom config allowing certain elements. Content in a <math> or <svg> element may not be sanitized correctly even if math and svg are not in the allowlist.

tags | advisory, bypass, ruby
systems | linux, debian
advisories | CVE-2020-4054
SHA-256 | 841aefd63808ad7adc10707677debc3dc7eae1c4b7ed749e71ba9b880b422a23
Download | Favorite | View
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