Technical Description

Multiple vulnerabilities were identified in Microsoft Internet Explorer, which could be exploited by remote attackers to execute arbitrary commands or disclose sensitive information.

The first issue is due to a design error in the processing of keyboard shortcuts for certain security dialogs, which could be exploited by remote attackers to delay the "File Download" dialog box and trick users into downloading and executing a malicious file.

The second vulnerability is due to a design error in the processing of mouse clicks in new browser windows and the predictability of the position of the "File Download" dialog box, which could be exploited to trick the user into clicking on the "Run" button of the dialog box.

The third flaw is due to an error in the way Internet Explorer behaves in certain situations where an HTTPS proxy server requires clients to use Basic authentication, which could allow attackers to read Web addresses in clear text sent from the browser to a proxy server.

The fourth issue is due to memory corruption errors when instantiating certain COM objects (Avifil32.dll, Comsvcs.dll, Mshtmled.dll, Ole2disp.dll, Oleaut32.dll, Outllib.dll, Quartz.dll, Repodbc.dll, and Shell.dll) as ActiveX controls, which could be exploited by remote attackers to execute arbitrary commands. This issue is similar to VUPEN/ADV-2005-0935 and VUPEN/ADV-2005-1450

The fifth vulnerability is due to an error in the way Internet Explorer handles mismatched Document Object Model objects, which could be exploited remote attackers to take complete control of an affected system by convincing a user to visit a malicious Web page. For additional information, see : VUPEN/ADV-2005-2509

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 with 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 Edition

Solution

Apply patches :
http://www.microsoft.com/technet/security/bulletin/ms05-054.mspx

References

http://www.vupen.com/english/advisories/2005/2867
http://www.microsoft.com/technet/security/bulletin/ms05-054.mspx

Credits

Vulnerabilities reported by Will Dormann, Andreas Sandblad and Jakob Balle.

ChangeLog

2005-12-13 : Initial release

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