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Read-only share recipient can restore old versions of file

Platform: ownCloud Server

Versions: 8.0.14, 8.1.9, 8.2.7, 9.0.4,

Date: 7/19/2016

Risk level: Low

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

CWE: Permission Issues (CWE-275)

HackerOne report: 146067

Description

The restore capability of ownCloud was not verifying whether an user has only read-only access to a share. Thus an user with read-only access was able to restore old versions.

Affected Software

Action Taken

The permission check is now also performed on restore actions.

Acknowledgements

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

  • Rudra Pratap Singh – Vulnerability discovery and disclosure.

This advisory is licensed CC BY-SA 4.0. Original source: nextcloud.com

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