CVE-2021-32728

medium

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.

References

https://www.debian.org/security/2021/dsa-4974

https://hackerone.com/reports/1189162

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5

https://github.com/nextcloud/desktop/pull/3338

Details

Source: Mitre, NVD

Published: 2021-08-18

Updated: 2022-10-04

Risk Information

CVSS v2

Base Score: 4

Vector: CVSS2#AV:N/AC:L/Au:S/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Severity: Medium