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Vulnerability Note VU#118737

Second Sight Software ActiveGS ActiveX control stack buffer overflows

Overview

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.

I. Description

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.

II. 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 code with the privileges of the user. The attacker could also cause the web browser to crash.

III. Solution

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

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:

    {052DF14F-6F28-44A0-9130-294FDA6176EB}
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. 

Systems Affected
VendorStatusDate Updated
Second Sight SoftwareVulnerable18-Apr-2007

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://support.microsoft.com/kb/240797
http://www.freetoolsassociation.com/
http://secunia.com/advisories/24960/

Credit

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

This document was written by Will Dormann.

Other Information

Date Public04/18/2007
Date First Published04/18/2007 01:22:09 PM
Date Last Updated04/19/2007
CERT Advisory 
CVE NameCVE-2007-1690
US-CERT Technical Alerts 
Metric0.74
Document Revision12

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

 
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