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…

PriorityP335high7.3CVSS 3.1

AVLACLPRLUIRSUCHIHAH

EPSS

0.47%

37.9th percentile

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.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
debian	nextcloud-desktop	—	—
nextcloud	desktop	>= 3.0.3 < 3.3.0	3.3.0
nextcloud	security-advisories	—	—

CVSS provenance

nvdv3.17.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

nvdv2.04.4MEDIUMAV:L/AC:M/Au:N/C:P/I:P/A:P

vendor_debian7.3LOW

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