Security Advisory

Content-Spoofing in "dav" app (NC-SA-2016-011)

10th October 2016

Risk level: Low

CVSS v3 Base Score: 3.1 (AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N)

CWE: User Interface (UI) Misrepresentation of Critical Information (CWE-451)

HackerOne report: 149798

Description

The exception message displayed on the DAV endpoints contained partially user-controllable input leading to a potential misrepresentation of information.

Affected Software

• Nextcloud Server < 10.0.1 (CVE-2016-9468)
• server/7350e13113c8ed484727a5c25331ec11d4d59f5f
• Nextcloud Server < 9.0.54 (CVE-2016-9468)
• server/a4cfb3ddc1f4cdb585e05c0e9b2f8e52a0e2ee3e

Action Taken

The user-controlled content has been removed from the exception message.

Resolution

It is recommended that all instances are upgraded to Nextcloud 9.0.54 or 10.0.1.

Acknowledgements

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

• YoKo Kho - MII CAS - Vulnerability discovery and disclosure.