CVE-2021-37617 is a vulnerability in Nextcloud Desktop
Published on August 18, 2021
Untrusted Search Path in Nextcloud Desktop Client
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.
Vulnerability Analysis
CVE-2021-37617 can be exploited with local system access, requires user interaction and a small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is an Untrusted Path Vulnerability?
The application searches for critical resources using an externally-supplied search path that can point to resources that are not under the application's direct control.
CVE-2021-37617 has been classified to as an Untrusted Path vulnerability or weakness.
Products Associated with CVE-2021-37617
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Affected Versions
nextcloud security-advisories Version >= 3.0.3 , <= 3.2.4 is affected by CVE-2021-37617Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.