CVE Vulnerability

CVE-2021-32728

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.

4 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

6.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-f5fr-5gcv-6cc5 Exploit Third Party Advisory
https://github.com/nextcloud/desktop/pull/3338 Patch Third Party Advisory
https://hackerone.com/reports/1189162 Exploit Third Party Advisory
https://www.debian.org/security/2021/dsa-4974 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:nextcloud:desktop:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Information

Published : 2021-08-18 04:15

Updated : 2022-10-04 02:14

NVD link : CVE-2021-32728

Mitre link : CVE-2021-32728

Products Affected
No products.
CWE
CWE-295

Improper Certificate Validation