Nextcloud Server up to 23.0.9/24.0.4 Calendar Name resource consumption

Summaryinfo

A vulnerability classified as problematic has been found in Nextcloud Server up to 23.0.9/24.0.4. This issue affects some unknown processing of the component Calendar Name Handler. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2022-41968. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Nextcloud Server up to 23.0.9/24.0.4 (Cloud Software). It has been classified as problematic. This affects some unknown processing of the component Calendar Name Handler. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. The summary by CVE is:

Nextcloud Server is an open source personal cloud server. Prior to versions 23.0.10 and 24.0.5, calendar name lengths are not validated before writing to a database. As a result, an attacker can send unnecessary amounts of data against the database. Version 23.0.10 and 24.0.5 contain patches for the issue. No known workarounds are available.

The weakness was disclosed 12/02/2022 as GHSA-m92j-xxc8-hq3v. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2022-41968 since 09/30/2022. 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 23.0.10 or 24.0.5 eliminates this vulnerability. Applying a patch 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

• 23.0.0
• 23.0.1
• 23.0.2
• 23.0.3
• 23.0.4
• 23.0.5
• 23.0.6
• 23.0.7
• 23.0.8
• 23.0.9
• 24.0.0
• 24.0.1
• 24.0.2
• 24.0.3
• 24.0.4

License

• open-source

Website

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

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