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.

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.

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.

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Solution

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

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Block the following DNS related records at network gateways:

* ATMA
* TXT
* X25
* HINFO
* ISDN DNS  

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Vendor Information

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Microsoft Corporation __ Affected

Notified: August 08, 2006 Updated: August 08, 2006

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Update

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

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23794580 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

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

Acknowledgements

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

CVE IDs:	CVE-2006-3441
Severity Metric:	6.75 Date Public: