Security Advisory

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Bypass of 2 Factor Authentication (NC-SA-2018-007)

3rd August 2018

Risk level: High

CVSS v3 Base Score: 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)

CWE: Improper Authentication - Generic (CWE-287)

HackerOne report: 248656

Description

Improper authentication of the second factor challenge would allow an attacker that had access to user credentials to bypass the second factor validation completely.

Affected Software

  • Nextcloud Server < 12.0.3 (2018-3775)

Action Taken

The error has been fixed and regression tests are in place.

Resolution

It is recommended that all instances are upgraded at least to Nextcloud 12.0.3.

Acknowledgements

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

  • kaysbugs - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.

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