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Category:   OS (Microsoft)  >   Windows Client-Server Run-time Subsystem Vendors:   Microsoft
Windows Client-Server Run-time Subsystem Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017433
SecurityTracker URL:  http://securitytracker.com/id/1017433
CVE Reference:   CVE-2006-6696   (Links to External Site)
Updated:  Apr 10 2007
Original Entry Date:  Dec 22 2006
Impact:   Execution of arbitrary code via local system, Execution of arbitrary code via network, Root access via local system, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 2000 SP4, 2003 SP2, XP SP2; and prior service packs; Vista
Description:   A vulnerability was reported in Windows Client-Server Run-time Subsystem. A remote user can execute arbitrary code on the target system. A local user can gain elevated privileges on the target system.

The system does not properly process error messages. A remote user can create specially crafted HTML that, when loaded by a target user, will trigger a memory corruption error and execute arbitrary code on the target user's system with system privileges. Also, a local user can also execute arbitrary code with system privileges.

The flaw can be triggered by a specially crafted call to the MessageBox() function.

A demonstration exploit is available at:

http://www.security.nnov.ru/files/messagebox.c

NULL reported this vulnerability.

The original advisory is available at:

http://www.kuban.ru/forum_new/forum2/files/19124.html

[Editor's note: This was originally reported as a local privilege escalation flaw but Microsoft has indicated that it is a remote code execution flaw.]

Impact:   A remote user can execute arbitrary code on the target system.

A local user can obtain elevated privileges on the target system.

Solution:   The vendor has issued the following fixes:

Microsoft Windows 2000 Service Pack 4:

http://www.microsoft.com/downloads/details.aspx?FamilyId=909e3b63-4d11-4fe6-849f-1ce960eb62cd

Microsoft Windows XP Service Pack 2:

http://www.microsoft.com/downloads/details.aspx?FamilyId=69876449-25d1-41b4-b7c8-2b7fb40e59ee

Microsoft Windows XP Professional x64 Edition and Microsoft Windows XP Professional x64 Edition Service Pack 2:

http://www.microsoft.com/downloads/details.aspx?FamilyId=91fd8716-c1a2-434e-bed0-df9d01e3d685

Microsoft Windows Server 2003, Microsoft Windows Server 2003 Service Pack 1, and Microsoft Windows Server 2003 Service Pack 2:

http://www.microsoft.com/downloads/details.aspx?FamilyId=4dac667d-b346-461e-8bb5-6112e946349f

Microsoft Windows Server 2003 for Itanium-based Systems, Microsoft Windows Server 2003 with SP1 for Itanium-based Systems, and Microsoft Windows Server 2003 with SP2 for Itanium-based Systems:

http://www.microsoft.com/downloads/details.aspx?FamilyId=639de6c7-0928-469a-be68-60ea391fa770

Microsoft Windows Server 2003 x64 Edition and Microsoft Windows Server 2003 x64 Edition Service Pack 2:

http://www.microsoft.com/downloads/details.aspx?FamilyId=69dbe4bc-05a5-450b-8c72-e431e800d4f3

Windows Vista:

http://www.microsoft.com/downloads/details.aspx?FamilyId=3487b1f0-a383-41a4-a660-2768962b3bcd

Windows Vista x64 Edition:

http://www.microsoft.com/downloads/details.aspx?FamilyId=c46f62e1-dddd-4886-a82b-ebec258a495b

A restart is required.

The Microsoft advisory is available at:

http://www.microsoft.com/technet/security/bulletin/ms07-021.mspx

The original Microsoft blog entry is available at:

http://blogs.technet.com/msrc/archive/2006/12/22/new-report-of-a-windows-vulnerability.aspx

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms07-021.mspx (Links to External Site)
Cause:   Input validation error

Message History:   None.


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