[NT] Microsoft Internet Explorer UTF-8 Decoding Heap Overflow Vulnerability

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Microsoft Internet Explorer UTF-8 Decoding Heap Overflow Vulnerability


Improper handling of UTF-8 strings allows attackers to execute arbitrary
code using Internet Explorer.


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

The specific vulnerability is due to a miscalculation of memory sizes when
translating UTF-8 characters to Unicode.
A size mismatch between a heap allocation and memory copy results in an
exploitable heap corruption.

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.
Exploitation does not require JavaScript, Java or ActiveX to be enabled.

CVE Information:

Vendor Status:
Microsoft has issued an update to correct this vulnerability. More details
can be found at:

Disclosure Timeline:
2006.01.20 - Vulnerability reported to vendor
2006.06.13 - Digital Vaccine released to TippingPoint customers
2006.06.13 - Coordinated public release of advisory


The information has been provided by <mailto: zdi-disclosures@xxxxxxxx>
The original article can be found at:
The vendor advisory can be found at:


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