The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. The Nextcloud Desktop Client invokes its uninstaller script when being installed to make sure there are no remnants of previous installations. In versions 3.0.3 through 3.2.4, the Client searches the `Uninstall.exe` file in a folder that can be written by regular users. This could lead to a case where a malicious user creates a malicious `Uninstall.exe`, which would be executed with administrative privileges on the Nextcloud Desktop Client installation. This issue is fixed in Nextcloud Desktop Client version 3.3.0. As a workaround, do not allow untrusted users to create content in the `C:\` system folder and verify that there is no malicious `C:\Uninstall.exe` file on the system.
The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control.
The product uses a fixed or controlled search path to find resources, but one or more locations in that path can be under the control of unintended actors.
| Link | Tags |
|---|---|
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24v | third party advisory |
| https://github.com/nextcloud/desktop/pull/3497 | third party advisory patch |
| https://hackerone.com/reports/1240749 | third party advisory permissions required |