[NT] Microsoft Internet Explorer DXImageTransform ActiveX Memory Corruption Vulnerability

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Microsoft Internet Explorer DXImageTransform ActiveX Memory Corruption
Vulnerability
------------------------------------------------------------------------


SUMMARY

Improper garbage collection handling allows attackers to execute arbitrary
code using the DXImageTransform ActiveX.

DETAILS

Vulnerable Systems:
* Internet Explorer 6 All Versions
* Internet Explorer 5 SP4

The specific flaw exists in the Microsoft ActiveX object
DXImageTransform.Microsoft.MMSpecialEffect1Input.
Due to improper garbage collection when another object is assigned to any
property, code execution is possible. This object implements the
IobjectSafety interface and thus the default Internet Explorer settings
allow for arbitrary code execution without any further user interaction.

Several related ActiveX objects suffer from the same problem including:

* DXImageTransform.Microsoft.MMSpecialEffect1Input.1
* DXImageTransform.Microsoft.MMSpecialEffect2Inputs
* DXImageTransform.Microsoft.MMSpecialEffect2Inputs.1
* DXImageTransform.Microsoft.MMSpecialEffectInplace1Input
* DXImageTransform.Microsoft.MMSpecialEffectInplace1Input.1

This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Microsoft Internet Explorer. Successful
exploitation requires that the target user browse to a malicious web page.

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2383>
CVE-2006-2383

Vendor Status:
Microsoft has issued an update to correct this vulnerability. More details
can be found at:
<http://www.microsoft.com/technet/security/bulletin/MS06-021.mspx>
http://www.microsoft.com/technet/security/bulletin/MS06-021.mspx.

Disclosure Timeline:
2006.04.27 Vulnerability reported to vendor
2006.06.13 Digital Vaccine released to TippingPoint customers
2006.06.13 Coordinated public release of advisory


ADDITIONAL INFORMATION

The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
ZDI.
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-06-018.html>
http://www.zerodayinitiative.com/advisories/ZDI-06-018.html
The vendor advisory can be found at:
<http://www.securiteam.com/windowsntfocus/5OP0C15IUS.html>
http://www.securiteam.com/windowsntfocus/5OP0C15IUS.html



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