A vulnerability classified as critical has been found in Nextcloud Server (Cloud Software). This affects an unknown part of the component Webservice. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Nextcloud server is an open source personal cloud platform. In affected versions it was found that locally running webservices can be found and requested erroneously. It is recommended that the Nextcloud Server is upgraded to 23.0.8 or 24.0.4. It is recommended that the Nextcloud Enterprise Server is upgraded to 22.2.10.4, 23.0.8 or 24.0.4. There are no known workarounds for this issue.

The weakness was presented 09/17/2022 as GHSA-rmf9-w497-8cq8. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2022-39211 since 09/02/2022. Neither technical details nor an exploit are publicly available.

Upgrading to version 22.2.10.4, 23.0.8 or 24.0.4 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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• Cloud Software

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• Nextcloud

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• Server

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• open-source

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