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CERT Coordination Center

Microsoft Java implementation JDBC classes do not properly validate DLL requests

Vulnerability Note VU#307306

Original Release Date: 2002-10-11 | Last Revised: 2003-11-07


The Java Database Connectivity (JDBC) classes of Microsoft's Java virtual machine (VM) do not properly validate DLL requests, allowing a malicious applet to load and execute any DLL on the client system.


Microsoft's Java VM is installed on Windows 98, NT, 2000, and XP. It is used by Internet Explorer and Outlook Express to execute Java applets.

The VM includes classes that provide JDBC functionality to Java applets. These classes do not properly validate requests to load and execute a DLL on the client system. Such requests are only to be honored if they come from applets that are authorized to load and execute DLLs. However, an unauthorized applet can send a request malformed in such a way that it will be accepted and honored by the JDBC classes. This vulnerability allows malicious Java applets to load and execute any DLL on the client system.


A malicious Java applet can load and execute any DLL on the client system.


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Vendor Information


Microsoft Corporation Affected

Notified:  October 10, 2002 Updated: October 11, 2002



Vendor Statement


Vendor Information

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


The CERT/CC has no additional comments at this time.

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

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Thanks to Jouko Pynnonen for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs: CVE-2002-0866
Severity Metric: 18.43
Date Public: 2002-09-09
Date First Published: 2002-10-11
Date Last Updated: 2003-11-07 17:02 UTC
Document Revision: 6

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