eBay Enhanced Picture Uploader ActiveX control vulnerable to arbitrary command execution

Overview

The eBay Enhanced Picture Uploader ActiveX control allows arbitrary commands to be executed.

Description

The eBay Enhanced Picture Uploader ActiveX control is used by the eBay web site to give Internet Explorer users additional functionality when uploading pictures to an auction. This ActiveX control is provided by the file EPUWALcontrol.dll. If an attacker provides a specially-crafted PictureUrls property or initialization parameter, the ActiveX control will execute the commands that are specified.

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Impact

By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary commands with the privileges of the user.

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Solution

Apply an update

This update is addressed in version 1.0.27 of the Ebay Enhanced Picture Control software. This update can be obtained by visiting the eBay web site, creating a new auction and uploading images with the Internet Explorer web browser. This control is also disabled in Internet Explorer with the update for Microsoft Security Advisory (969898). Please see the eBay security center announcement for additional details.

Please also consider the following workarounds:

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Disable the eBay Enhanced Picture Uploader ActiveX control in Internet Explorer

The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSIDs:

{4C39376E-FA9D-4349-BACC-D305C1750EF3}
{C3EB1670-84E0-4EDA-B570-0B51AAE81679}
More information about how to set the kill bit is available in Microsoft Support Document 240797. Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\``{4C39376E-FA9D-4349-BACC-D305C1750EF3}``]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\``{C3EB1670-84E0-4EDA-B570-0B51AAE81679}``]
"Compatibility Flags"=dword:00000400
Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this and other ActiveX vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can be found in the “Securing Your Web Browser” document.

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Vendor Information

983731

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eBay __ Affected

Notified: August 27, 2008 Updated: June 09, 2009

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.

Vendor References

• <http://pages.ebay.com/securitycenter/activex/index.html&gt;

Addendum

This update is addressed in version 1.0.27 of the Ebay Enhanced Picture Control software. This update can be obtained by visiting the eBay web site, creating a new auction and uploading images with the Internet Explorer web browser. This control is also disabled in Internet Explorer with the update for Microsoft Security Advisory (969898). Please see the eBay security center announcement for additional details.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23983731 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://pages.ebay.com/securitycenter/activex/index.html&gt;
• <http://www.microsoft.com/technet/security/advisory/969898.mspx&gt;
• <http://support.microsoft.com/kb/240797&gt;

Acknowledgements

Thanks to Chris Weber of Casaba Security for reporting this vulnerability.

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2008-2475
Severity Metric:	7.36 Date Public: