__________________________________________________________
	
						   The U.S. Department of Energy
					   Computer Incident Advisory Capability
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								 INFORMATION BULLETIN
	
						Java Runtime Environment Vulnerability
								 [Sun Alert ID: 102993]
	
	July 12, 2007 16:00 GMT                                           Number R-304
	______________________________________________________________________________
	PROBLEM:       The Java XML Digital Signature implementation that is included 
				   in the JDK and JRE 6 release does not securely process XSLT 
				   stylesheets contained in XSLT Transforms in XML Signatures. 
	PLATFORM:      Jave 2 Platform, Standard Edition 
	DAMAGE:        Could lead to the executionof arbitrary code with the 
				   permissions of the application processing XML signatures that 
				   include these XSLT stylesheets. 
	SOLUTION:      Upgrade to the appropriate version. 
	______________________________________________________________________________
	VULNERABILITY  The risk is LOW. Difficult to exploit, requires trusted local 
	ASSESSMENT:    application. 
	______________________________________________________________________________
	LINKS: 
	 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/r-304.shtml 
	 ORIGINAL BULLETIN:  http://www.sunsolve.sun.com/search/document.do?assetkey=1
								 -26-102993-1 
	______________________________________________________________________________
	[***** Start Sun Alert ID: 102993 *****]
	
	Sun(sm) Alert Notification
	Sun Alert ID: 102993
	Synopsis: Java Runtime Environment Does Not Securely Process XSLT Stylesheets 
				 Contained in XML Signatures
	Category: Security
	Product: Java 2 Platform, Standard Edition
	BugIDs: 6519471
	Avoidance: Patch, Upgrade
	State: Resolved
	Date Released: 10-Jul-2007
	Date Closed: 10-Jul-2007
	Date Modified: 
	
	1. Impact
	The Java XML Digital Signature implementation that is included in the JDK and 
	JRE 6 release does not securely process XSLT stylesheets contained in XSLT 
	Transforms in XML Signatures. This could lead to the execution of arbitrary 
	code with the permissions of the application processing XML signatures that 
	include these XSLT stylesheets.
	
	Sun acknowledges with thanks, Brad Hill of iSEC Partners, for bringing this 
	issue to our attention.
	
	2. Contributing Factors
	This issue can occur in the following releases (for Windows, Solaris, and Linux):
	
	JDK and JRE 6 Update 1 and earlier
	
	Note: SDK and JRE 5.0 and 1.4.x are not affected by this issue. (The XML Digital 
	Signature implementation was not included in SDK and JRE 5.0 and 1.4.x releases).
	
	For this vulnerability to be exploited, a trusted application needs to process an 
	XML signature with an XSLT stylesheet that contains malicious content. This 
	vulnerability cannot be exploited through an untrusted applet or untrusted Java 
	Web Start application.
	
	To determine the default version of the JRE on a system for Solaris and Linux, 
	the following command can be run:
	
		% java -version
		
	(The above command only determines the default version. Other versions may also 
	be installed on the system).
	
	To determine the default version of the JRE on a system for Windows:
	
	Click "Start"
	Select "Run"
	Type "cmd" (starts a command-line)
	At the prompt, type "java -version"
	
	(The above command only determines the default version. Other versions may also 
	be installed on the system).
	
	3. Symptoms
	There are no predictable symptoms that would indicate the described issue has 
	been exploited.
	
	
	
	Solution Summary Top 
	
	4. Relief/Workaround
	There is no workaround for this issue. Please see the Resolution section below.
	
	
	
	5. Resolution
	This issue is addressed in the following releases (for Windows, Solaris, and Linux):
	
	JDK and JRE 6 Update 2 or later
	
	Java SE 6 is available for download at the following link:
	
	http://java.sun.com/javase/downloads/index.jsp
	
	Java SE 6 Update 2 for Solaris is available in the following patches:
	
	Java SE 6 update 2 (as delivered in patch 125136-02 or later)
	Java SE 6 update 2 (as delivered in patch 125137-02 or later (64bit))
	Java SE 6_x86 update 2 (as delivered in patch 125138-02 or later)
	Java SE 6_x86 update 2 (as delivered in patch 125139-02 or later (64bit))
	
	Note: When installing a new version of the product from a source other than a 
	Solaris patch, it is recommended that the old affected versions be removed from 
	your system. For more information, please see the installation notes on the 
	respective java.sun.com download pages.
	
	
	
	This Sun Alert notification is being provided to you on an "AS IS" basis. This 
	Sun Alert notification may contain information provided by third parties. The 
	issues described in this Sun Alert notification may or may not impact your 
	system(s). Sun makes no representations, warranties, or guarantees as to the 
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	INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
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	Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 
	CA 95054 U.S.A. All rights reserved.
	
	
	
	
	
	[***** End Sun Alert ID: 102993 *****]
	_______________________________________________________________________________
	
	CIAC wishes to acknowledge the contributions of Sun Microsystems for the 
	information contained in this bulletin.
	_______________________________________________________________________________
	
	
	CIAC, the Computer Incident Advisory Capability, is the computer
	security incident response team for the U.S. Department of Energy
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