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CERT Coordination Center

RealNetworks GameHouse dldisplay ActiveX control stack buffer overflows

Vulnerability Note VU#179105

Original Release Date: 2007-06-19 | Last Revised: 2009-04-13


The RealNetworks GameHouse dldisplay ActiveX control contains multiple stack buffer overflows, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.


RealNetworks GameHouse is a web site that provides games. GameHouse has an ActiveX control called dldisplay, which is provided by ghdlctl.dll. This ActiveX control contains multiple stack buffer overflows.


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 code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.


We are currently unaware of a practical solution to this problem. Please consider the following workarounds

Disable the GameHouse dldisplay ActiveX control in Internet Explorer

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

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\{4F5E4276-C120-11D6-A1FD-00508B9D48EA}]
"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. 

Vendor Information


RealNetworks, Inc. Affected

Notified:  March 06, 2007 Updated: June 18, 2007



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.


Please disable the vulnerable ActiveX control.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector



This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2007-2924
Severity Metric: 0.86
Date Public: 2007-06-19
Date First Published: 2007-06-19
Date Last Updated: 2009-04-13 17:14 UTC
Document Revision: 10

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