INFORMATION BULLETIN

S-221: Learn2 STRunner ActiveX Control Vulnerabilities

[US-CERT Vulnerability Note VU#524857]

March 4, 2008 16:00 GMT


PROBLEM:	The Learn2 STRunner ActiveX control contains multiple stack buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
PLATFORM:	Learn2 STRunner
DAMAGE:	Execute arbitrary code.
SOLUTION:	There is curretnly no practical solution. Please see the bulletin below for workarounds.

VULNERABILITY ASSESSMENT:	The risk is LOW. 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.

LINKS:
CIAC BULLETIN:	http://www.ciac.org/ciac/bulletins/s-221.shtml
ORIGINAL BULLETIN:	http://www.kb.cert.org/vuls/id/524857
CVE:	CVE-2007-6252

[***** Start US-CERT Vulnerability Note VU#524857 *****]

Vulnerability Note VU#524857

Learn2 STRunner ActiveX control stack buffer overflows

Overview

The Learn2 STRunner ActiveX control contains multiple stack buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

The Learn2 Corporation STRunner ActiveX control, which is provided by iestm32.dll, can view multimedia streams that are commonly used in online tutorials. This ActiveX control, which is also known as the Street Technologies ActiveX Control, 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.

III. Solution

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

Disable the Learn2 STRunner ActiveX control in Internet Explorer

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

{0B72CCA4-5F11-11D0-9CB5-0000C0EC9FDB}

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\{0B72CCA4-5F11-11D0-9CB5-0000C0EC9FDB}]

"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
Learn2 Corporation	Vulnerable	28-Feb-2008

References

http://www.cert.org/tech_tips/securing_browser
http://www.securityfocus.com/bid/28058
http://support.microsoft.com/kb/240797

Credit

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

This document was written by Will Dormann.

Other Information

Date Public	02/29/2008
Date First Published	02/29/2008 11:05:16 AM
Date Last Updated	02/29/2008
CERT Advisory
CVE Name	CVE-2007-6252
US-CERT Technical Alerts
Metric	3.79
Document Revision	7


[***** End US-CERT Vulnerability Note VU#524857 *****]

CIAC wishes to acknowledge the contributions of US-CERT for the information contained in this bulletin.

CIAC services are available to DOE, DOE Contractors, and the NIH. CIAC can be contacted at:

    Voice:          +1 925-422-8193 (7 x 24)
    FAX:            +1 925-423-8002
    STU-III:        +1 925-423-2604
    E-mail:          ciac@ciac.org
    World Wide Web:  http://www.ciac.org/
    Anonymous FTP:   ftp.ciac.org

This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes.

UCRL-MI-119788
[Privacy and Legal Notice]