Cross-site Scripting (XSS) Affecting ruby-sanitize package, versions <4.6.6-2.1~0.20.04.1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.13% (50th percentile)

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  • Snyk IDSNYK-UBUNTU2004-RUBYSANITIZE-1011882
  • published23 Sept 2020
  • disclosed16 Jun 2020

Introduced: 16 Jun 2020

CVE-2020-4054  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 ruby-sanitize to version 4.6.6-2.1~0.20.04.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ruby-sanitize package and not the ruby-sanitize package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

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 Base Scores

version 3.1