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CVE-2021-32727 Detail

Description

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.


Metrics

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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID CWE Name Source
CWE-295 Improper Certificate Validation cwe source acceptance level NIST   GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-32727
NVD Published Date:
07/12/2021
NVD Last Modified:
11/21/2024
Source:
GitHub, Inc.