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AUSCERT External Security Bulletin Redistribution
ESB-2008.0144 -- [Win][UNIX/Linux][Solaris]
A Vulnerability in the Java Runtime Environment XML Parsing
Code May Allow URL Resources to be Accessed
11 February 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: Java 2 Platform, Standard Edition
JDK 6 Update 3 and earlier
JRE 6 Update 3 and earlier
Publisher: Sun Microsystems
Operating System: Solaris
UNIX variants (UNIX, Linux, OSX)
Windows
Impact: Execute Arbitrary Code/Commands
Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-231246-1
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Solution Type: Sun Alert
Solution 231246 : A Vulnerability in the Java Runtime Environment
XML Parsing Code May Allow URL Resources to be Accessed
Product
Java 2 Platform, Standard Edition
Bug ID: 6568262
Date of Resolved Release: 30-JAN-2008
SA Document Body
A Vulnerability in the Java Runtime Environment XML Parsing Code May Allow URL
Resources to be Accessed (see details below)
1. Impact
The Java Runtime Environment (JRE) by default allows external entity
references to be processed. To turn off processing of external entity
references, sites can set the "external general entities" property to
FALSE. This property is provided since it may be possible to leverage
the processing of external entity references to access certain URL
resources (such as some files and web pages) or create a Denial of
Service (DoS) condition on the system running the JRE. A defect in the
JRE allows external entity references to be processed even when the
"external general entities" property is set to FALSE.
For this vulnerability to be exploited, a trusted application needs to
process XML data that contains malicious content. This vulnerability
cannot be exploited through an untrusted applet or untrusted Java Web
Start application.
Sun acknowledges with thanks, Chris Evans and Johannes Henkel of the
Google Security Team for bringing this issue to our attention.
2. Contributing Factors
This issue can occur in the following releases (for all supported
platforms):
* JDK and JRE 6 Update 3 and earlier
Note: JDK and JRE 5.0, and SDK and JRE 1.4.x and 1.3.x are not
affected by this issue.
To determine the default version of the JRE on a system for Solaris
and Linux, the following command can be run:
% java -version
Note: 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:
1. Click "Start"
2. Select "Run"
3. Type "cmd" (starts a command-line)
4. At the prompt, type "java -version"
Note: 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.
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 all supported
platforms):
* JDK and JRE 6 Update 4 or later
JDK and JRE 6 Update 4 is available for download at the following
link:
http://java.sun.com/javase/downloads/index.jsp
JDK 6 Update 4 for Solaris is also available in the following patches:
* Java SE 6 update 4 (as delivered in patch 125136-05 or later)
* Java SE 6 update 4 (as delivered in patch 125137-05 or later
(64bit))
* Java SE 6 x86 update 4 (as delivered in patch 125138-05 or
later)
* Java SE 6 x86 update 4 (as delivered in patch 125139-05 or
later (64bit))
Note: The "external general entities" property needs to be set to
FALSE to prevent the processing of external entity references. The
property can be set by calling the setFeature method on a factory
instance for DOM and SAX:
factory.setFeature("http://xml.org/sax/features/external-general-entities",
false);
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. To remove old affected versions on the
Windows platform, please see:
http://java.com/en/download/help/uninstall_java.xml
For more information on Security Sun Alerts, see Sun Infodoc 91209.
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 information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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