Discourse up to 3.0.0/3.1.0.beta1 URL full name cross site scripting

Summaryinfo

A vulnerability described as problematic has been identified in Discourse up to 3.0.0/3.1.0.beta1. Affected is an unknown function of the component URL Handler. Executing a manipulation of the argument full name can lead to cross site scripting. The identification of this vulnerability is CVE-2023-25172. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic was found in Discourse up to 3.0.0/3.1.0.beta1. This vulnerability affects an unknown code block of the component URL Handler. The manipulation of the argument full name with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

Discourse is an open-source discussion platform. Prior to version 3.0.1 of the `stable` branch and version 3.1.0.beta2 of the `beta` and `tests-passed` branches, a maliciously crafted URL can be included in a user's full name field to to carry out cross-site scripting attacks on sites with a disabled or overly permissive CSP (Content Security Policy). Discourse's default CSP prevents this vulnerability. The vulnerability is patched in version 3.0.1 of the `stable` branch and version 3.1.0.beta2 of the `beta` and `tests-passed` branches. As a workaround, enable and/or restore your site's CSP to the default one provided with Discourse.

The weakness was shared 03/18/2023 as GHSA-7pm2-prxw-wrvp. The advisory is available at github.com. This vulnerability was named CVE-2023-25172 since 02/03/2023. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 3.0.1 or 3.1.0.beta2 eliminates this vulnerability. Applying the patch 1a5a6f66cb821ed29a737311d6fdc2eba5adc915 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Chat Software

Name

• Discourse

Version

• 3.0
• 3.1.0.beta1

License

• open-source

Website

• Product: https://github.com/discourse/discourse/

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