Security Advisory

Content-Spoofing in "files" app (NC-SA-2016-003)

19th July 2016

Risk level: Low

CVSS v3 Base Score: 0 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N)

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

HackerOne report: 145463

Description

The location bar in the files app was not verifying the passed parameters. An attacker could craft an invalid link to a fake directory structure and use this to display an attacker-controlled error message to the user.

Affected Software

• Nextcloud Server < 9.0.52 (CVE-2016-9460)
• server/2da43e3751576bbc838f238a09955c4dcdebee8e
• server/8aa0832bd449c44ec300da4189bd8ed4e036140c
• server/dea8e29289a1b99d5e889627c2e377887f4f2983

Action Taken

The passed parameter is now verified.

Resolution

It is recommended that all instances are upgraded to Nextcloud 9.0.52.

Acknowledgements

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

• Md. Ishrat Shahriyar - Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0.