Vulnerability Note VU#307306

Microsoft Java implementation JDBC classes do not properly validate DLL requests

Overview

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.

I. Description

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.

II. Impact

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

III. Solution

Apply a patch

For more information, see:

http://www.microsoft.com/technet/security/bulletin/MS02-052.asp

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	11-Oct-2002

References

http://www.securityfocus.com/bid/5670
http://www.microsoft.com/technet/security/bulletin/MS02-052.asp

Credit

Thanks to Jouko Pynnonen for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

Date Public:	2002-09-09
Date First Published:	2002-10-11
Date Last Updated:	2003-11-07
CERT Advisory:
CVE-ID(s):	CAN-2002-0866
NVD-ID(s):	CAN-2002-0866
US-CERT Technical Alerts:
Metric:	18.43
Document Revision:	4

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