SunnComm MediaMax privilege elevation vulnerability

Overview

SunnComm MediaMax contains a privilege elevation vulnerability, which may allow a user with limited rights to execute code with elevated privileges.

Description

SunnComm MediaMax

SunnComm MediaMax is copy protection software that is automatically installed by some audio CDs. Sony BMG has provided a list of titles that include MediaMax version 5 software. A device driver is Included with the MediaMax software, which prevents the CD from being copied. The user must be a member of the Windows “Administrators” or “Power Users” group for the software to install. Note that the driver and part of the software is installed before the End User License Agreement (EULA) is presented to the user.

The problem

The MediaMax software is installed with file permissions that are not restrictive enough. The MediaMax software is located in “\Program Files\Common Files\SunnComm Shared.” The MediaMax installer grants “Full Control” file permissions to “Everyone,” which means that any user of the system may replace the MediaMax software with arbitrary code. The next time a CD that contains MediaMax is launched, this code will run with the privileges of the user that is logged on. If the user who launches the MediaMax CD has administrative privileges, then the attacker-supplied code will also run with administrative privileges.

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Impact

This vulnerability may give a user with access to the filesystem the ability to execute arbitrary code with elevated privileges.

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Solution

Apply a patch or update
SunnComm has provided a Frequently Asked Questions document and an update to address this issue.

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Disable Autorun

To help protect yourself against software running without your consent, disable Autorun as described in Microsoft Support Document 155217. This will prevent Windows from automatically running software when CD or DVD media is inserted.

Use least privilege

Use “least privilege” approach to user accounts. By reducing the privileges of the user accounts, the impact of this and other vulnerabilties may be reduced. More information about this technique is available in the Microsoft TechNet article Applying the Principle of Least Privilege to User Accounts on Windows XP.

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Vendor Information

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Sony BMG __ Affected

Notified: April 10, 2006 Updated: April 12, 2006

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see the MediaMax Frequently Asked Questions. This document contains information about the vulnerability and also provides an update to the software.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23928689 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.sunncomm.com/support/faq/&gt;
• <http://www.sonybmg.com/mediamax/titles.html&gt;
• <http://www.eff.org/IP/DRM/Sony-BMG/MediaMaxVulnerabilityReport.pdf&gt;
• <http://www.eff.org/news/archives/2005_12.php#004234&gt;
• <http://www.securityfocus.com/bid/15754&gt;
• <http://securitytracker.com/id?1015327&gt;
• <http://secunia.com/advisories/17933&gt;

Acknowledgements

Thanks to EFF for reporting this vulnerability, who in turn credit Jesse Burns and Alex Stamos of iSEC Partners.

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2005-4069
Severity Metric:	2.81 Date Public: