Description: Michal Zalewski has discovered a vulnerability in Internet Explorer, which potentially can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to an array boundary error in the handling of HTML tags with multiple event handlers (e.g. onLoad). This can be exploited to corrupt memory in a way that may allow execution of arbitrary code via a malicious HTML document containing an HTML tag with 94 or more event handlers.
The vulnerability has been confirmed on a fully patched system with Internet Explorer 6.0 and Microsoft Windows XP SP2.
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.
Internet Explorer 6 SP1 on Windows 98, Windows 98 SE, or Windows ME:
Patches are available via the Microsoft Update Web site or the Windows Update Web site.
Provided and/or discovered by: Michal Zalewski
Changelog: 2006-04-12: Updated "Description" and "Solution" sections. Added CVE reference. Added link to Microsoft security bulletin. Added link to US-CERT vulnerability note.
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