CVE-2021-32728
Description
The Nextcloud Desktop Client is a tool to synchronize files from Nextcloud Server with a computer. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.3.0, the Nextcloud Desktop client fails to check if a private key belongs to previously downloaded public certificate. If the Nextcloud instance serves a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. This issue is fixed in Nextcloud Desktop Client version 3.3.0. There are no known workarounds aside from upgrading.
How to fix
- nextcloud desktop3.3.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nextcloud desktop | v < 3.3.0 | 3.3.0 |
| debian debian_linux | 10.0, 11.0 | — |
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