Technical Description

A vulnerability has been identified in Microsoft Internet Explorer, which could be exploited by remote attackers to take complete control of an affected system. This flaw is due to an error in the Drag and Drop functionality that fails to properly validate certain Dynamic HTML (DHTML) events and methods provided by the DHTML Object Model, which could be exploited by malicious web sites to bypass security restrictions and place arbitrary executables on a vulnerable system by tricking a user into clicking and dragging an object from a specially crafted browser window to another window pointing to local resources.

Note : Significant user interaction is required to exploit this vulnerability.

Affected Products

Microsoft Internet Explorer 5.01 SP4 on Microsoft Windows 2000 SP4
Microsoft Internet Explorer 6 SP1 on Microsoft Windows 2000 SP4
Microsoft Internet Explorer 6 SP1 on Microsoft Windows XP SP1
Microsoft Internet Explorer 6 for Microsoft Windows XP SP2
Microsoft Internet Explorer 6 for Microsoft Windows Server 2003
Microsoft Internet Explorer 6 for Microsoft Windows Server 2003 SP1
Microsoft Internet Explorer 6 for Microsoft Windows Server 2003 (Itanium)
Microsoft Internet Explorer 6 for Microsoft Windows Server 2003 SP1 (Itanium)
Microsoft Internet Explorer 6 for Microsoft Windows Server 2003 x64 Edition
Microsoft Internet Explorer 6 for Microsoft Windows XP Professional x64 Edition
Microsoft Internet Explorer 5.5 SP2 on Microsoft Windows Millennium Edition
Microsoft Internet Explorer 6 SP1 on Microsoft Windows 98
Microsoft Internet Explorer 6 SP1 on Microsoft Windows 98 SE
Microsoft Internet Explorer 6 SP1 on Microsoft Windows Millennium

Solution

VUPEN Security is not aware of any vendor-supplied patch.
Workarounds
Disable Active Scripting in the Internet and Local intranet security zones :
- In Internet Explorer, click Internet Options on the Tools menu
- Click the Security tab
- Click Internet, and then click Custom Level
- Under Settings, in the Scripting section, under Active Scripting, click Disable, and then click OK
- Click Local intranet, and then click Custom Level
- Under Settings, in the Scripting section, under Active Scripting, click Disable, and then click OK
- If you are prompted to confirm that you want to change these settings, click Yes
- Click OK to return to Internet Explorer
Note : Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly.

References

http://www.vupen.com/english/advisories/2006/0553
http://blogs.technet.com/msrc/archive/2006/02/13/419439.aspx
http://www.securiteam.com/windowsntfocus/5MP0B0UHPA.html

Credits

Vulnerability reported by Matthew Murphy

ChangeLog

2006-02-13 : Initial release

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