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Microsoft Data Access Components (MDAC) contains buffer overflow

Vulnerability Note VU#139150

Original Release Date: 2004-01-19 | Last Revised: 2004-01-19


Microsoft Data Access Components (MDAC) contains a buffer overflow vulnerability that could allow a remote attacker to execute arbitrary code or cause a denial of service.


From Microsoft Security Bulletin MS04-003:

Microsoft Data Access Components (MDAC) is a collection of components that provides the underlying functionality for a number of database operations, such as connecting to remote databases and returning data to a client.
MS04-003 notes that "...MDAC is a ubiquitous technology" that is installed as part of Windows 2000, Windows XP, and other Microsoft programs (e.g., Microsoft Access and Microsoft SQL Server).

An MDAC client sends a network broadcast to port 1434/udp to query for systems running Microsoft SQL Server. A buffer overflow vulnerability exists in an MDAC component that handles responses to such a query. The vulnerability could be triggered by a specially crafted response packet. An MDAC client is only vulnerable for some period of time after it issues a query.


A remote attacker could execute arbitrary code with the privileges of the process using MDAC. The attacker could also cause a denial of service.


Apply patch
Apply the appropriate patch referenced in Microsoft Security Bulletin MS04-003.

Block or Restrict Access

Block or restrict inbound access to port 1434/udp. Note that a firewall that performs stateful inspection may allow inbound responses after recording an outbound broadcast.

Vendor Information


Microsoft Corporation Affected

Updated:  January 19, 2004



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.


Please see Microsoft Security Bulletin MS04-003.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

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Information used in this document came from Microsoft Security Bulletin MS04-003.

This document was written by Art Manion.

Other Information

CVE IDs: CVE-2003-0903
Severity Metric: 10.60
Date Public: 2004-01-13
Date First Published: 2004-01-19
Date Last Updated: 2004-01-19 14:58 UTC
Document Revision: 28

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