Security Advisory

Bypass lock protection in Android app (NC-SA-2019-004)

26th July 2019

Risk level: Low

CVSS v3 Base Score: 5.9 (AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N)

CWE: Authentication Bypass Using an Alternate Path or Channel (CWE-288)

HackerOne report: 490946

Description

Creating a fake multi-account and aborting the process would redirect the user to the default account of the device without asking for the lock pattern if one was set up.

Affected Software

• Nextcloud Android < 3.6.1 (CVE-2019-5455)

Action Taken

The error has been fixed.

Resolution

It is recommended that users upgrade to version 3.6.1.

Acknowledgements

The Nextcloud team thanks the following people for their research and responsible disclosure of the above advisory:

• Julien Thomas - Protektoid.com project - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.