Nextcloud Server/Enterprise Server insufficient privileges

Summaryinfo

A vulnerability was found in Nextcloud Server and Enterprise Server and classified as problematic. This vulnerability affects unknown code. Such manipulation leads to insufficient privileges. This vulnerability is traded as CVE-2023-35928. The attack may be launched remotely. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in Nextcloud Server and Enterprise Server (Cloud Software) (the affected version is unknown). It has been rated as problematic. Affected by this issue is an unknown code. The manipulation with an unknown input leads to a insufficient privileges vulnerability. Using CWE to declare the problem leads to CWE-274. The product does not handle or incorrectly handles when it has insufficient privileges to perform an operation, leading to resultant weaknesses. Impacted is confidentiality. CVE summarizes:

Nextcloud Server is a space for data storage on Nextcloud, a self-hosted productivity playform. In NextCloud Server versions 25.0.0 until 25.0.7 and 26.0.0 until 26.0.2 and Nextcloud Enterprise Server versions 19.0.0 until 19.0.13.9, 20.0.0 until 20.0.14.14, 21.0.0 until 21.0.9.12, 22.0.0 until 22.2.10.12, 23.0.0 until 23.0.12.7, 24.0.0 until 24.0.12.2, 25.0.0 until 25.0.7, and 26.0.0 until 26.0.2, a user could use this functionality to get access to the login credentials of another user and take over their account. This issue has been patched in Nextcloud Server versions 25.0.7 and 26.0.2 and NextCloud Enterprise Server versions 19.0.13.9, 20.0.14.14, 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2. Three workarounds are available. Disable app files_external. Change config setting "Allow users to mount external storage" to disabled in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages`. Change config setting to disallow users to create external storages in "Administration" > "External storage" settings `…/index.php/settings/admin/externalstorages` with the types FTP, Nextcloud, SFTP, and/or WebDAV.

The weakness was shared 06/24/2023 as GHSA-637g-xp2c-qh5h. The advisory is available at github.com. This vulnerability is handled as CVE-2023-35928 since 06/20/2023. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Type

• Cloud Software

Vendor

• Nextcloud

Name

• Enterprise Server
• Server

License

• open-source

Website

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

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