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Category:   OS (Microsoft)  >   Windows Kernel Vendors:   Microsoft
Microsoft Windows May Load DLLs Unsafely and Remotely Execute Arbitrary Code
SecurityTracker Alert ID:  1024877
SecurityTracker URL:  http://securitytracker.com/id/1024877
CVE Reference:   CVE-2010-3966   (Links to External Site)
Date:  Dec 14 2010
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 7, 2008 R2; and prior service packs
Description:   A vulnerability was reported in Microsoft Windows. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted DLL file on a remote share (e.g., WebDAV, SMB share). When the target application is loaded by the target user and the target user opens a .eml, .rss (Windows Live Mail), or .wpost (Microsoft Live Writer) file on that remote share, the system may load the remote user's DLL instead of the intended DLL and execute arbitrary code. The code will run with the privileges of the target user.

This type of exploit is also known as "binary planting" or "DLL preloading".

Platforms that do not support the BranchCache functionality are affected.

Haifei Li of Fortinet's FortiGuard Labs reported this vulnerability.

Impact:   A remote user can may be able to cause a target application to execute arbitrary code on the target user's system.
Solution:   The vendor has issued the following fixes:

Windows 7 for 32-bit Systems:

http://www.microsoft.com/downloads/details.aspx?familyid=75591D37-2CB8-4CDF-ACBB-89CD0D1A9290

Windows 7 for x64-based Systems:

http://www.microsoft.com/downloads/details.aspx?familyid=3A0C4DD0-98B4-4E7A-99ED-22B9D9F76CD1

Windows Server 2008 R2 for x64-based Systems:

http://www.microsoft.com/downloads/details.aspx?familyid=F58A765F-CEA9-456D-B0AB-BFC70B109CBF

Windows Server 2008 R2 for Itanium-based Systems:

http://www.microsoft.com/downloads/details.aspx?familyid=13A9F838-AC07-43DC-9AEE-A77207998E1E

A restart is required.

The Microsoft advisory is available at:

http://www.microsoft.com/technet/security/bulletin/ms10-095.mspx

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms10-095.mspx (Links to External Site)
Cause:   Access control error

Message History:   None.


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