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Vulnerability Note VU#603529

Zenturi ProgramChecker ActiveX buffer overflow vulnerabilities

Overview

Zenturi ProgramChecker contains multiple ActiveX buffer overflows, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

Zenturi ProgramChecker is a set of "... easy to use tools to analyze, validate, authenticate and research the programs that run on their PCs." Zenturi ProgramChecker includes multiple ActiveX controls, which are provided by sasatl.dll. These ActiveX controls contain multiple 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 Zenturi ProgramChecker ActiveX controls in Internet Explorer

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

    {048313BB-3B82-47A8-8164-533F1D7C7C9D}
    {0FA0B4FF-1A6F-4D89-995C-29FFD33F4EE0}
    {59DBDDA6-9A80-42A4-B824-9BC50CC172F5}
    {66C7B32A-9642-41A4-BCF7-A166D1547770}
    {6754F588-E262-42D2-A6BC-3BB400ACFEED}
    {7D6B5B24-FC7E-11D1-9288-00104B885781}
    {A364AF35-0CDF-41E8-8F3B-E0E55E15EBA1}
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_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{048313BB-3B82-47A8-8164-533F1D7C7C9D}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{0FA0B4FF-1A6F-4D89-995C-29FFD33F4EE0}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{59DBDDA6-9A80-42A4-B824-9BC50CC172F5}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{66C7B32A-9642-41A4-BCF7-A166D1547770}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{6754F588-E262-42D2-A6BC-3BB400ACFEED}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{7D6B5B24-FC7E-11D1-9288-00104B885781}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{A364AF35-0CDF-41E8-8F3B-E0E55E15EBA1}]
    "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
Zenturi, Inc.Vulnerable29-May-2007

References


http://www.us-cert.gov/reading_room/securing_browser/#Internet_Explorer
http://support.microsoft.com/kb/240797
http://secunia.com/advisories/25473/

Credit

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

This document was written by Will Dormann.

Other Information

Date Public05/29/2007
Date First Published05/29/2007 02:05:03 PM
Date Last Updated05/30/2007
CERT Advisory 
CVE Name 
US-CERT Technical Alerts 
Metric1.03
Document Revision5

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