Vulnerability Note VU#484649

Microsoft Windows DNS Server vulnerable to cache poisoning

Overview

The Microsoft Windows DNS Server is vulnerable to cache poisoning, which may allow a remote, unauthenticated attacker to cause a Windows DNS server to provide incorrect responses to DNS queries.

I. Description

Microsoft Windows DNS Server is a service that provides DNS serving capabilities for Windows 2000 server and Windows Server 2003. For a DNS server to trust a reply to a DNS request, the reply must contain the correct client source port and address as well as an identifier known as the transaction ID. Windows DNS server uses a predictable transaction ID generator, which can allow DNS cache poisoning.

II. Impact

A remote, unauthenticated attacker may be able to poison the cache of a Windows DNS server. This can cause client machines that use the DNS server to be redirected to malicious domains as the result of an incorrect DNS response.

III. Solution

Apply an update

This issue is addressed in Microsoft Security Bulletin MS07-062.

Systems Affected

Vendor	Status	Date Updated
Microsoft Corporation	Vulnerable	13-Nov-2007

References

http://www.microsoft.com/technet/security/bulletin/ms07-062.mspx
http://www.trusteer.com/docs/windowsdns.html

Credit

This vulnerability was reported by Microsoft, who in turn credit Alla Berzroutchko of Scanit and Amit Klein of Trusteer.

This document was written by Will Dormann.

Other Information

Date Public	11/13/2007
Date First Published	11/13/2007 02:28:28 PM
Date Last Updated	11/13/2007
CERT Advisory
CVE Name	CVE-2007-3898
US-CERT Technical Alerts
Metric	4.39
Document Revision	3

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Produced 2007 by US-CERT, a government organization
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