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Category:   OS (Microsoft)  >   Windows DLL (Any) Vendors:   Microsoft
Windows Winsock and DNS Client Buffer Overflows Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1016653
SecurityTracker URL:  http://securitytracker.com/id/1016653
CVE Reference:   CVE-2006-3440, CVE-2006-3441   (Links to External Site)
Date:  Aug 8 2006
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2000 SP4, XP SP2, 2003 SP1; and prior service packs
Description:   A vulnerability was reported in Windows in the Winsock and DNS client code. A remote user can execute arbitrary code on the target system.

A remote user can create specially crafted HTML that, when loaded by the target user, will trigger a buffer overflow in the Winsock API and execute arbitrary code on the target system.

A remote user can also send specially crafted DNS data to trigger a buffer overflow in the Windows DNS client layer and execute arbitrary code on the target system. The code will run with the privileges of the target service.

Microsoft credits Peter Winter Smith of NGS Software with reporting the Winsock Hostname vulnerability and Mark Dowd of ISS X-Force with reporting the DNS Client Buffer Overrun vulnerability.

Impact:   A remote user can execute arbitrary code 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=144408a7-3011-458a-bc79-49b1658aa25d

Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2:

http://www.microsoft.com/downloads/details.aspx?FamilyId=c332b95a-2956-406b-9e06-07c5e96b02e3

Microsoft Windows XP Professional x64 Edition:

http://www.microsoft.com/downloads/details.aspx?FamilyId=1be5310b-1995-4ef9-a462-04da9833f50b

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

http://www.microsoft.com/downloads/details.aspx?FamilyId=6d027e72-1f94-44de-95f9-f52000a991cc

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

http://www.microsoft.com/downloads/details.aspx?FamilyId=18477016-0b70-4c86-90c7-3535d365b7c1

Microsoft Windows Server 2003 x64 Edition:

http://www.microsoft.com/downloads/details.aspx?FamilyId=583b741c-47e2-429d-9d50-44670bb2f452

The Microsoft advisory is available at:

http://www.microsoft.com/technet/security/bulletin/ms06-041.mspx

A restart is required.

Vendor URL:  www.microsoft.com/technet/security/bulletin/ms06-041.mspx (Links to External Site)
Cause:   Boundary error

Message History:   None.


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