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Vulnerability Note VU#794580

Microsoft DNS Client buffer overflow

Overview

The Microsoft DNS Client service contains a remote code execution vulnerability that could allow a remote attacker to take complete control of the affected system.

I. Description

From Microsoft TechNet:

    The Domain Name System (DNS) client service resolves and caches DNS names. The DNS client service must be running on every computer that will perform DNS name resolution. The ability to resolve DNS names is crucial for locating domain controllers in Active Directory domains. The DNS client service is also critical for locating devices identified using DNS name resolution.

The DNS client layer contains an unchecked buffer which could be exploited by a remote and unauthenticated attacker to gain access to the system.

II. Impact

A remote, unauthenticated attacker can gain complete control of a system, including the ability to install programs, view, change or delete data, or create new accounts, by one of the following means:

  1. Sending a specially crafted DNS communication to an affected system from a subnet between the target host and DNS server; or
  2. Convince the target host to make a DNS request to receive a specially crafted record response from an attacking server.

III. Solution

Update


Apply the update provided by Microsoft. Refer to Microsoft Security Bulletin MS06-041 for more information.

Block the following DNS related records at network gateways:

  • ATMA
  • TXT
  • X25
  • HINFO
  • ISDN DNS

Systems Affected
VendorStatusDate Updated
Microsoft CorporationVulnerable8-Aug-2006

References


http://www.microsoft.com/technet/security/bulletin/ms06-041.mspx
http://technet2.microsoft.com/WindowsServer/en/Library/6715556b-dfe4-41c4-87a9-333d22e473b21033.mspx?mfr=true

Credit

This vulnerability was reported by Microsoft, who in turn credit Mark Dowd of ISS X-Force for reporting this vulnerability.

This document was written by Joseph W Pruszynski.

Other Information

Date Public08/08/2006
Date First Published08/08/2006 04:45:40 PM
Date Last Updated08/08/2006
CERT Advisory 
CVE NameCVE-2006-3441
US-CERT Technical Alerts 
Metric6.75
Document Revision20

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