John Heasman of NGSSoftware has discovered a high risk vulnerability in Sun 
Microsystem's Java Web Start that ships with the JRE and JDK on Windows 
platforms.

The vulnerability affects the following version of Java Web Start:

Java Web Start in JDK and JRE 5.0 Update 11 and earlier
Java Web Start in SDK and JRE 1.4.2_13 and earlier

This vulnerability permits an untrusted Java Web Start application to 
overwrite any file that can be accessed under the application user context. 
This ultimately enables an untrusted application to break out of the sandbox 
by modifying the user's Java security policy.  An untrusted application 
could be launched via a malicious web page.


Details
*******
The JNLP API defines a set of services that bypass the security sandbox to 
enable some common client operations. The BasicService is used to discover 
the application's codebase. Then, the PersistenceService caches content on 
the local hard drive, keyed to a URL that is relative to the application's 
base. The name/value pairs provided by the PersistenceService are similar to 
browser cookies. The Java Web Start implementation honours this legacy by 
naming the pairs "muffins".

Arbitrary files can be written to due to a directory traversal flaw in the 
PersistenceService.

Solution
********
This issue has now been resolved; further details are available at: 
http://sunsolve.sun.com/search/document.do?assetkey=1-26-102957-1

NGSSoftware Insight Security Research
http://www.ngssoftware.com
http://www.databasesecurity.com/
+44(0)208 401 0070

--
E-MAIL DISCLAIMER

The information contained in this email and any subsequent
correspondence is private, is solely for the intended recipient(s) and
may contain confidential or privileged information. For those other than
the intended recipient(s), any disclosure, copying, distribution, or any
other action taken, or omitted to be taken, in reliance on such
information is prohibited and may be unlawful. If you are not the
intended recipient and have received this message in error, please
inform the sender and delete this mail and any attachments.

The views expressed in this email do not necessarily reflect NGS policy.
NGS accepts no liability or responsibility for any onward transmission
or use of emails and attachments having left the NGS domain.

NGS and NGSSoftware are trading names of Next Generation Security
Software Ltd. Registered office address: 52 Throwley Way, Sutton, SM1
4BF with Company Number 04225835 and VAT Number 783096402