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low3.5

CVE-2021-32679

Nextcloud Server is a Nextcloud package that handles data storage.

Impact

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in controllers using `DownloadResponse`. When a user-supplied filename was passed unsanitized into a `DownloadResponse`, this could be used to trick users into downloading malicious files with a benign file extension. This would show in UI behaviours where Nextcloud applications would display a benign file extension (e.g. JPEG), but the file will actually be downloaded with an executable file extension. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. Administrators of Nextcloud instances do not have a workaround available, but developers of Nextcloud apps may manually escape the file name before passing it into `DownloadResponse`.

Affected products

VendorProductAffected versions
NextcloudNextcloud Server
before 19.0.13
from 20.0.0 before 20.0.11
from 21.0.0 before 21.0.3
FedoraprojectFedora
Versions 33, 34

Weakness classification

CWE-116

References