Nextcloud Server up to 28.0.9/29.0.6 Pre-flighted HEAD Request resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Nextcloud Server up to 28.0.9/29.0.6. This affects an unknown part of the component Pre-flighted HEAD Request Handler. This manipulation causes resource consumption. This vulnerability appears as CVE-2024-52520. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Nextcloud Server up to 28.0.9/29.0.6. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component Pre-flighted HEAD Request Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect availability. The summary by CVE is:

Nextcloud Server is a self hosted personal cloud system. Due to a pre-flighted HEAD request, the link reference provider could be tricked into downloading bigger websites than intended, to find open-graph data. It is recommended that the Nextcloud Server is upgraded to 28.0.10 or 29.0.7 and Nextcloud Enterprise Server is upgraded to 27.1.11.8, 28.0.10 or 29.0.7.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2024-52520 since 11/11/2024. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 28.0.10 or 29.0.7 eliminates this vulnerability. Applying the patch 873c42b0f1383d5b6f2b7a481e1d9620ed30f44a 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

• Cloud Software

Vendor

• Nextcloud

Name

• Server

Version

• 28.0.0
• 28.0.1
• 28.0.2
• 28.0.3
• 28.0.4
• 28.0.5
• 28.0.6
• 28.0.7
• 28.0.8
• 28.0.9
• 29.0.0
• 29.0.1
• 29.0.2
• 29.0.3
• 29.0.4
• 29.0.5
• 29.0.6

License

• open-source

Website

• Product: https://github.com/nextcloud/server/

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