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Java Runtime Environment Remote Denial-of-Service (DoS) Vulnerability
From: Marc Schoenefeld <schonef () uni-muenster de>
Date: Wed, 22 Dec 2004 12:42:04 +0100 (MEZ)
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after my bug report in april 2004 Sun fixed an issue with
remote and local object serialisation. If getting
a bad object package your server may become unresponsive and does not
accept further requests but it does not crash. A PoC exploit
showed that with a little lower socket work RMI communication
is affected, too.
In my opinion it is a deep concept bug (antipattern) in JDK serialisation
semantics, but JDK 1.4.2_06 is only a detail fix.
So chances are high that there are more bugs like this in your JDK
or your application, even after an upgrade to JDK 1.4.2_06.
Below is the relevant snippet from:
Happy Xmas and a great 2005 to all
Sun(sm) Alert Notification
* Sun Alert ID: 57707
* Synopsis: Java Runtime Environment Remote Denial-of-Service (DoS)
* Category: Security
* Product: Java SDK and JRE
* BugIDs: 5037001
* Avoidance: Upgrade
* State: Resolved
* Date Released: 20-Dec-2004
* Date Closed: 20-Dec-2004
* Date Modified:
A vulnerability in the Java Runtime Environment (JRE) involving object
deserialization could be exploited remotely to cause the Java Virtual
Machine to become unresponsive, which is a type of Denial-of-Service (DoS).
This issue can affect the JRE if an application that runs on it accepts
serialized data from an untrusted source.
Sun acknowledges with thanks, Marc Schoenefeld, for bringing this issue to
2. Contributing Factors
This issue can occur in the following releases:
* SDK and JRE 1.4.2_05 and earlier, and all 1.4.1 and 1.4.0 releases
for Windows, Solaris and Linux
Note: JDK and JRE 5.0 and releases prior to SDK and JRE 1.4 are not
affected by this issue.
To determine the version of Java on a system, the following command can be
% java -fullversion
java full version "1.4.1_06-b01"
The Java Runtime Environment (JRE) is unresponsive.
Solution Summary Top
There is no workaround. Please see the "Resolution" section below.
This issue is addressed in the following releases:
* SDK and JRE 1.4.2_06 and later for Windows, Solaris, and Linux
J2SE releases are available for download at:
* J2SE 5.0 at http://java.sun.com/j2se/1.5.0/download.jsp
* J2SE 1.4.2_06 at http://java.sun.com/j2se/1.4.2/download.html and
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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- Java Runtime Environment Remote Denial-of-Service (DoS) Vulnerability Marc Schoenefeld (Dec 22)