[cfgeeks] High Risk Flaw in Sun's Java Web Start

[Kevin P. Inscoe]

----- Forwarded message from NGSSoftware Insight Security Research <nisr at ngssoftware.com> -----

From: NGSSoftware Insight Security Research <nisr at ngssoftware.com>
To: bugtraq at securityfocus.com, full-disclosure at lists.grok.org.uk,
	vulnwatch at vulnwatch.org
Subject: High Risk Flaw in Sun's Java Web Start
Date: Mon, 2 Jul 2007 20:06:44 +0100
X-Mailer: Microsoft Outlook Express 6.00.2900.3138

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

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----- End forwarded message -----

-- 
Kevin P. Inscoe                       Amateur Radio Call Sign: KE3VIN
Deltona, FL 32738                                28.9497N by 81.1952W
kevin [at] inscoe [dot] org                    http://kevininscoe.com
GPG 0x61288D53
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