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Category:   Application (Generic)  >   Microsoft DNS Server Vendors:   Microsoft
Microsoft Windows DNS Service Insufficent Entropy Lets Remote Users Spoof the DNS Service
SecurityTracker Alert ID:  1018942
SecurityTracker URL:
CVE Reference:   CVE-2007-3898   (Links to External Site)
Date:  Nov 13 2007
Impact:   Disclosure of system information, Disclosure of user information, Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2000 SP4, 2003 SP2; and prior service packs
Description:   A vulnerability was reported in the Microsoft Windows DNS Service. A remote user can conduct DNS spoofing attacks.

The Windows DNS Server service on Windows 2000 and Windows 2003 does not provide sufficient entropy when generating pseudo-random transaction values in queries sent to upstream DNS servers.

A remote user can send specially crafted DNS responses to the target system (in response to DNS requests) to cause network traffic processed or generated by the target system to be routed to an alternate system.

Alla Berzroutchko of Scanit and Amit Klein of Trusteer reported this vulnerability.

Impact:   A remote user can spoof the DNS services.
Solution:   The vendor has issued the following fixes:

Microsoft Windows 2000 Server Service Pack 4:

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

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

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

A restart is required.

The Microsoft advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Randomization error
Underlying OS:   Windows (2000), Windows (2003)

Message History:   None.

 Source Message Contents

Date:  Tue, 13 Nov 2007 13:05:02 -0500
Subject:  Microsoft Security Bulletin MS07-062 Important: Vulnerability in DNS Could Allow Spoofing (941672)


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