CVE Vulnerability

CVE-2021-32727

Nextcloud Android Client is the Android client for Nextcloud. Clients using the Nextcloud end-to-end encryption feature download the public and private key via an API endpoint. In versions prior to 3.16.1, the Nextcloud Android client skipped a step that involved the client checking if a private key belonged to a previously downloaded public certificate. If the Nextcloud instance served a malicious public key, the data would be encrypted for this key and thus could be accessible to a malicious actor. The vulnerability is patched in version 3.16.1. As a workaround, do not add additional end-to-end encrypted devices to a user account.

5 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 10 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

7.5 /10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

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-5v33-r9cm-7736 Third Party Advisory
https://github.com/nextcloud/android/pull/8438 Third Party Advisory
https://github.com/nextcloud/end_to_end_encryption_rfc/blob/7f002996397faefb664019a97ebb0a1e210f64f0/RFC.md#further-devices Third Party Advisory
https://hackerone.com/reports/1189162 Permissions Required
Configurations

Configuration 1

cpe:2.3:a:nextcloud:nextcloud:*:*:*:*:*:android:*:*
Information

Published : 2021-07-12 09:15

Updated : 2021-07-14 01:23

NVD link : CVE-2021-32727

Mitre link : CVE-2021-32727

Products Affected
No products.
CWE
CWE-295

Improper Certificate Validation