MediaWiki up to 1.34.0 CSS escape output

Summaryinfo

A vulnerability described as problematic has been identified in MediaWiki up to 1.34.0. The affected element is an unknown function of the component CSS Handler. Executing a manipulation can lead to escape output. This vulnerability is tracked as CVE-2020-10960. The attack can be launched remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in MediaWiki up to 1.34.0 (Content Management System) and classified as problematic. This vulnerability affects an unknown code block of the component CSS Handler. The manipulation with an unknown input leads to a escape output vulnerability. The CWE definition for the vulnerability is CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. As an impact it is known to affect integrity. CVE summarizes:

In MediaWiki before 1.34.1, users can add various Cascading Style Sheets (CSS) classes (which can affect what content is shown or hidden in the user interface) to arbitrary DOM nodes via HTML content within a MediaWiki page. This occurs because jquery.makeCollapsible allows applying an event handler to any Cascading Style Sheets (CSS) selector. There is no known way to exploit this for cross-site scripting (XSS).

The weakness was disclosed 04/03/2020 (Website). The advisory is shared for download at lists.wikimedia.org. This vulnerability was named CVE-2020-10960 since 03/25/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 249991 (Linux Distros Unpatched Vulnerability : CVE-2020-10960), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.34.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (249991). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Content Management System

Name

• MediaWiki

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34.0

License

• open-source

Website

• Product: https://www.mediawiki.org/wiki/MediaWiki

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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