CVE-2021-37617: Untrusted Search Path in Nextcloud Desktop Client
First published: Wed Aug 18 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Nextcloud Desktop Client | >=3.0.3<3.3.0 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is CVE-2021-37617?
CVE-2021-37617 is a vulnerability in the Nextcloud Desktop Client that can allow remnants of previous installations to remain on a computer.
How does CVE-2021-37617 affect Nextcloud Desktop Client?
CVE-2021-37617 affects Nextcloud Desktop Client versions 3.0.3 through 3.2.4, allowing remnants of previous installations to persist.
What is the severity of CVE-2021-37617?
CVE-2021-37617 has a severity level of 7.3 (high).
How can I fix CVE-2021-37617?
To fix CVE-2021-37617, update your Nextcloud Desktop Client to version 3.3.0 or higher.
Where can I find more information about CVE-2021-37617?
You can find more information about CVE-2021-37617 at the following references: [GitHub pull request](https://github.com/nextcloud/desktop/pull/3497), [Nextcloud security advisory](https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24v), [HackerOne report](https://hackerone.com/reports/1240749).
- agent/weakness
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/remedy
- agent/last-modified-date
- agent/author
- agent/severity
- agent/references
- agent/title
- agent/description
- agent/first-publish-date
- agent/event
- agent/source
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/nextcloud
- canonical/nextcloud desktop client
- version/nextcloud desktop client/3.0.3