Vulnerability Note VU#441785

SupportSoft ActiveX controls contain multiple buffer overflows

Original Release date: 23 Feb 2007 | Last revised: 13 Apr 2009

Overview

The SupportSoft ActiveX controls contain multiple buffer overflow vulnerabilities, which could allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

Description

SupportSoft provides multiple ActiveX packages that are used by third party vendors to provide remote assistance and other technical support functions. The controls are commonly used by internet service providers (ISPs) and PC manufacturers. The SupportSoft ActiveX control packages contain multiple buffer overflow vulnerabilities. Many of these buffer overflows can be used to overwrite the process Structured Exception Handler (SEH) or otherwise overwrite the contents of the EIP (Extended Instruction Pointer) register, thus gaining control of program execution flow.

According to the SupportSoft ActiveX Controls Security Update, one should search for any of the following files to determine if a system may be vulnerable:

    tgctlsi.dll
    tgctlins.dll
    sdcnetcheck.dll
    tgctlar.dll
    tgctlch.dll
    tgctlpr.dll
    tgctlcm.dll
    tglib.dll
    tgctlidx.dll
Note that since the vulnerable controls are commonly included with third-party software that is not explicitly packaged as "SupportSoft," searching for the above files is the most effective way to determine if a system is vulnerable.

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.

Solution

Apply an update
Please check with your vendor for an update specific to your vendor's product.

Symantec customers should apply an update, as specified by Symantec advisory SYM07-002.

For customers where the vendor has not supplied an update, please apply an update as specified in the SupportSoft Security Update. This update provides download links to installers for the fixed 6.5.x and 5.6.x controls. Please note that a computer system may have both 6.x and 5.x components installed, which would require installing both update packages.


Disable vulnerable SupportSoft ActiveX controls in Internet Explorer

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

    {01010200-5e80-11d8-9e86-0007e96c65ae}
    {01010e00-5e80-11d8-9e86-0007e96c65ae}
    {01011300-5e80-11d8-9e86-0007e96c65ae}
    {01013A00-5E80-11D8-9E86-0007E96C65AE}
    {01013B00-5E80-11D8-9E86-0007E96C65AE}
    {01013C00-5E80-11D8-9E86-0007E96C65AE}
    {01013D00-5E80-11D8-9E86-0007E96C65AE}
    {01013F00-5E80-11D8-9E86-0007E96C65AE}
    {01014000-5E80-11D8-9E86-0007E96C65AE}
    {01014100-5E80-11D8-9E86-0007E96C65AE}
    {01014B00-5E80-11D8-9E86-0007E96C65AE}
    {01111c00-3e00-11d2-8470-0060089874ed}
    {01111e00-3e00-11d2-8470-0060089874ed}
    {01111f00-3e00-11d2-8470-0060089874ed}
    {01112500-3e00-11d2-8470-0060089874ed}
    {01112800-3e00-11d2-8470-0060089874ed}
    {01113300-3e00-11d2-8470-0060089874ed}
    {01114200-3e00-11d2-8470-0060089874ed}
    {01114300-3e00-11d2-8470-0060089874ed}
    {01114400-3e00-11d2-8470-0060089874ed}
    {01114500-3e00-11d2-8470-0060089874ed}
    {01114600-3e00-11d2-8470-0060089874ed}
    {01114700-3e00-11d2-8470-0060089874ed}
    {01114800-3e00-11d2-8470-0060089874ed}
    {01116e00-3e00-11d2-8470-0060089874ed}

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\{01010200-5e80-11d8-9e86-0007e96c65ae}]

    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01010e00-5e80-11d8-9e86-0007e96c65ae}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01011300-5e80-11d8-9e86-0007e96c65ae}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01013A00-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01013B00-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01013C00-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01013D00-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01013F00-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01014000-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01014100-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01014B00-5E80-11D8-9E86-0007E96C65AE}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01111c00-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01111e00-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01111f00-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01112500-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01112800-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01113300-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114200-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114300-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114400-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114500-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114600-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114700-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01114800-3e00-11d2-8470-0060089874ed}]
    "Compatibility Flags"=dword:00000400

    [HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\ActiveX Compatibility\{01116e00-3e00-11d2-8470-0060089874ed}]
    "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 (Learn More)

VendorStatusDate NotifiedDate Updated
BellSouthAffected-20 Feb 2007
ComcastAffected-20 Feb 2007
IBM CorporationAffected-20 Feb 2007
SupportSoft, Inc.Affected21 Aug 200622 Feb 2007
Symantec, Inc.Affected21 Aug 200622 Feb 2007
TDCAffected-20 Feb 2007
Time WarnerAffected-20 Feb 2007
3MUnknown-20 Feb 2007
Automatic Data ProcessingUnknown-20 Feb 2007
Bank of AmericaUnknown-21 Feb 2007
BelgacomUnknown-20 Feb 2007
Bharti EnterprisesUnknown-20 Feb 2007
Bresnan CommunicationsUnknown-20 Feb 2007
BTUnknown-20 Feb 2007
CasemaUnknown-20 Feb 2007
If you are a vendor and your product is affected, let us know.View More »

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A

References

Credit

This vulnerability was reported by Will Dormann of CERT/CC. It was also independently discovered by Mark Litchfield of NGS Software and Peter Vreugdenhil.

This document was written by Will Dormann.

Other Information

  • CVE IDs: CVE-2006-6490
  • Date Public: 22 Feb 2007
  • Date First Published: 23 Feb 2007
  • Date Last Updated: 13 Apr 2009
  • Severity Metric: 15.15
  • Document Revision: 33

Feedback

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