Wagtail up to 4.1.3/4.2.1 Document Upload resource consumption

Summaryinfo

A vulnerability was found in Wagtail up to 4.1.3/4.2.1. It has been declared as problematic. This affects an unknown function of the component Document Upload Handler. Such manipulation leads to resource consumption. This vulnerability is traded as CVE-2023-28837. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Wagtail up to 4.1.3/4.2.1. Affected by this issue is some unknown processing of the component Document Upload Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. CVE summarizes:

Wagtail is an open source content management system built on Django. Prior to versions 4.1.4 and 4.2.2, a memory exhaustion bug exists in Wagtail's handling of uploaded images and documents. For both images and documents, files are loaded into memory during upload for additional processing. A user with access to upload images or documents through the Wagtail admin interface could upload a file so large that it results in a crash of denial of service. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin. It can only be exploited by admin users with permission to upload images or documents. Image uploads are restricted to 10MB by default, however this validation only happens on the frontend and on the backend after the vulnerable code. Patched versions have been released as Wagtail 4.1.4 and Wagtail 4.2.2). Site owners who are unable to upgrade to the new versions are encouraged to add extra protections outside of Wagtail to limit the size of uploaded files.

The weakness was shared 04/04/2023 as GHSA-33pv-vcgh-jfg9. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-28837 since 03/24/2023. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 4.1.4 or 4.2.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 3c0c64642b9e5b8d28b111263c7f4bddad6c3880 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

Name

• Wagtail

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.2.0
• 4.2.1

License

• open-source

Website

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

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