Executive Summary

Title Learn2 STRunner ActiveX control stack buffer overflows
Name VU#524857 First vendor Publication 2008-02-29
Vendor VU-CERT Last vendor Modification 2008-02-29
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 6.8 Attack Range Network
Cvss Impact Score 6.4 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores


Vulnerability Note VU#524857

Learn2 STRunner ActiveX control stack buffer overflows


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.

I. Description

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:

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_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX 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

VendorStatusDate Updated
Learn2 CorporationVulnerable28-Feb-2008




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

This document was written by Will Dormann.

Other Information

Date Public02/29/2008
Date First Published02/29/2008 11:05:16 AM
Date Last Updated02/29/2008
CERT Advisory 
CVE NameCVE-2007-6252
US-CERT Technical Alerts 
Document Revision7

Original Source

Url : http://www.kb.cert.org/vuls/id/524857

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-119 Failure to Constrain Operations within the Bounds of a Memory Buffer

CPE : Common Platform Enumeration

Application 1

Open Source Vulnerability Database (OSVDB)

Id Description
42554 Learn2 Corporation STRunner iestm32.dll ActiveX Unspecified Overflows

Snort® IPS/IDS

Date Description
2014-01-10 Learn2 STRunner ActiveX function call unicode access
RuleID : 13546 - Revision : 6 - Type : WEB-ACTIVEX
2014-01-10 Learn2 STRunner ActiveX function call access
RuleID : 13545 - Revision : 10 - Type : BROWSER-PLUGINS
2014-01-10 Learn2 STRunner ActiveX clsid unicode access
RuleID : 13544 - Revision : 6 - Type : WEB-ACTIVEX
2014-01-10 Learn2 STRunner ActiveX clsid access
RuleID : 13543 - Revision : 11 - Type : BROWSER-PLUGINS

Nessus® Vulnerability Scanner

Date Description
2008-03-05 Name : The remote Windows host has an ActiveX control that is susceptible to multipl...
File : learn2_strunner_overflows.nasl - Type : ACT_GATHER_INFO

Alert History

If you want to see full details history, please login or register.
Date Informations
2014-02-17 12:07:55
  • Multiple Updates