Java Runtime Environment Remote Denial-of-Service (DoS) Vulnerability

[Marc Schoenefeld <schonef () uni-muenster de>]

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Good day,

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:

http://classic.sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F57707&zone_32=category%3A%2Asecurity

Happy Xmas and a great 2005 to all
Marc


> > Sun(sm) Alert Notification
> >
> >    * Sun Alert ID: 57707
> >    * Synopsis: Java Runtime Environment Remote Denial-of-Service (DoS)
Vulnerability
> >    * 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:
> >
> > 1. Impact
> >
> > 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
our attention.
> > 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
run:
> >    % java -fullversion
> >    java full version "1.4.1_06-b01"
> >
> > 3. Symptoms
> >
> > The Java Runtime Environment (JRE) is unresponsive.
> > Solution Summary      Top
> > 4. Relief/Workaround
> >
> > There is no workaround. Please see the "Resolution" section below.
> > 5. Resolution
> >
> > 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
http://java.com/











- --

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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