Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Desktop | >= 3.0.3, < 3.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/nextcloud/desktop/pull/3497PatchThird Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-vThird Party Advisory
- https://hackerone.com/reports/1240749Permissions RequiredThird Party Advisory
- https://github.com/nextcloud/desktop/pull/3497PatchThird Party Advisory
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-vThird Party Advisory
- https://hackerone.com/reports/1240749Permissions RequiredThird Party Advisory
FAQ
What is CVE-2021-37617?
CVE-2021-37617 is a vulnerability with a CVSS score of 7.3 (HIGH). 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 a...
How severe is CVE-2021-37617?
CVE-2021-37617 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-37617?
Check the references section above for vendor advisories and patch information. Affected products include: Nextcloud Desktop.