Vulnerability Note VU#330289

Logitech VideoCall multiple ActiveX controls contain stack buffer overflows

Overview

Logitech VideoCall ActiveX controls contain multiple stack buffer overflows, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

Logitech VideoCall is video conferencing software for Windows. Logitech VideoCall includes multiple ActiveX controls that contain multiple stack buffer overflows, including the following:

• VibeC (vibecontrol.dll)
• CallManager (StarClient.dll)
• ViewerClient (StarClient.dll)
• ComLink (uicomlink.dll)
• WebCamXMP (wcamxmp.dll)

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 Internet Explorer (or the program using the WebBrowser control) to crash.

III. Solution

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

Disable the VideoCall ActiveX controls in Internet Explorer

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

{54da0fb5-483a-4c53-810b-f131d50a8eb6}
{6577b09d-c39d-4e22-9913-c99803f9c388}
{917b29f8-e72a-4761-8371-bf7fca27eb31}
{bef0f488-3562-435f-8e89-79d94c9a528c}
{bf4c7b03-f381-4544-9a33-cb6dad2a87cd}

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 these controls:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{54da0fb5-483a-4c53-810b-f131d50a8eb6}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{6577b09d-c39d-4e22-9913-c99803f9c388}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{917b29f8-e72a-4761-8371-bf7fca27eb31}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{bef0f488-3562-435f-8e89-79d94c9a528c}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{bf4c7b03-f381-4544-9a33-cb6dad2a87cd}]
"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

Vendor	Status	Date Updated
Logitech	Vulnerable	30-May-2007

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://support.microsoft.com/kb/240797
http://secunia.com/advisories/25514/

Credit

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

This document was written by Will Dormann.

Other Information

Date Public	05/31/2007
Date First Published	05/31/2007 11:20:04 AM
Date Last Updated	06/01/2007
CERT Advisory
CVE Name	CVE-2007-2918
Metric	1.55
Document Revision	8