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CERT Coordination Center

Second Sight Software ActiveGS ActiveX control stack buffer overflows

Vulnerability Note VU#118737

Original Release Date: 2007-04-18 | Last Revised: 2010-04-22


The Second Sight Software ActiveGS ActiveX control contains several stack buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.


Second Sight Software ActiveGS is an Apple IIGS emulator that is provided as an ActiveX control. The control, which is provided by ActiveGS.ocx, contains multiple stack buffer overflow vulnerabilities.


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 the web browser to crash.


Apply an update

This issue is addressed in ActiveGS 3.x and higher.

Disable the ActiveGS 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\{052DF14F-6F28-44A0-9130-294FDA6176EB}]
"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


Second Sight Software Affected

Notified:  February 26, 2007 Updated: April 22, 2010



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.


This issue is addressed in ActiveGS 3.x and higher.

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 CERT/CC.

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2007-1690
Severity Metric: 0.74
Date Public: 2007-04-18
Date First Published: 2007-04-18
Date Last Updated: 2010-04-22 13:29 UTC
Document Revision: 14

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