Vulnerability Details CVE-2021-37617
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 52.8%
CVSS Severity
CVSS v3 Score 7.3
CVSS v2 Score 4.4
References
- https://github.com/nextcloud/desktop/pull/3497
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24v
- https://hackerone.com/reports/1240749
- https://github.com/nextcloud/desktop/pull/3497
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-6q2w-v879-q24v
- https://hackerone.com/reports/1240749
Products affected by CVE-2021-37617
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cpe:2.3:a:nextcloud:desktop:3.0.3
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cpe:2.3:a:nextcloud:desktop:3.1.0
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cpe:2.3:a:nextcloud:desktop:3.1.1
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cpe:2.3:a:nextcloud:desktop:3.1.2
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cpe:2.3:a:nextcloud:desktop:3.1.3
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cpe:2.3:a:nextcloud:desktop:3.2.0
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cpe:2.3:a:nextcloud:desktop:3.2.1
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cpe:2.3:a:nextcloud:desktop:3.2.2