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Auth bypass in /lib/base.php

Platform: ownCloud Server

Versions: 4.0.8,

Date: 8/10/2012

Risk level: High

Description

/lib/base.php before ownCloud 4.0.8 does not properly validate the user_id session variable via WebDAV, which allows authenticated attackers to gain access to other users files.

Affected Software

  • ownCloud Server < 4.0.8 (CVE-2012-5336)

Action Taken

It is recommended that all instances are upgraded to ownCloud Server 4.0.8.

Acknowledgements

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

  • Lukas Reschke – ownCloud Inc. (lukas@owncloud.org) – Vulnerability discovery and disclosure.

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