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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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