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AUSCERT External Security Bulletin Redistribution
ESB-2007.0489 -- [Win]
Security Vulnerability With Java Web Start May Allow
Application to Escalate Privileges
8 August 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Java Web Start, JDK and JRE 5.0 Update 11 and earlier
Java Web Start, SDK and JRE 1.4.2_13 and earlier
Publisher: Sun Microsystems
Operating System: Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2007-3504
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102957-1
http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-java-web-start/
Revision History: August 8 2007: Corrected error in the CVE Name field
July 3 2007: Added CVE Name and NGS advisory
July 2 2007: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102957
* Synopsis: Security Vulnerability With Java Web Start May Allow
Application to Escalate Privileges
* Category: Security
* Product: Java 2 Platform, Standard Edition
* BugIDs: 6499357
* Avoidance: Upgrade
* State: Resolved
* Date Released: 28-Jun-2007
* Date Closed: 28-Jun-2007
* Date Modified:
1. Impact
A vulnerability in Java Web Start may allow an untrusted application
to grant itself permissions to overwrite any file that is writable by
the user running the application. This would include the user's
.java.policy file which would allow the application to invoke applets
or Java Web Start applications that can execute arbitrary code with
the permissions of the user running the untrusted application.
Sun acknowledges, with thanks, John Heasman of NGSSoftware Limited,
for bringing this issue to our attention.
2. Contributing Factors
This issue can occur in the following releases:
Windows Platform
* 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
Notes:
1. Java Web Start in JDK and JRE 6 are not affected by this issue.
2. The Solaris Operating System is not affected by this issue.
3. The Linux Operating System is not affected by this issue.
To determine the version of Java on a system, the following command
can be run:
% java -version
java version "1.5.0_02-b09"
3. Symptoms
There are no reliable symptoms that would indicate the described issue
has been exploited.
4. Relief/Workaround
To work around the described issue, disable Java Web Start
applications from being launched from a web browser as follows:
Internet Explorer:
1. Right click on the "Start" button and select "Explore"
2. In the "Start Menu" window, select "Tools" => "Folder Options"
3. From the "Folder Options" window, select the "File Types" tab
4. From the "Registered File Types" window, scroll down and locate
the "JNLP - JNLP File"
5. Select the "JNLP - JNLP File" and click the "Delete" button
Mozilla:
1. Select "Preferences" under the browser's "Edit" menu
2. In the "Preferences" window, select "Helper Applications" located
under the "Navigator" category
3. Under "Files types", scroll down and locate
"application/x-java-jnlp-file"
4. Select "application/x-java-jnlp-file" and click the "Remove"
button
Notes:
1. On Windows, applications may also be launched from the desktop icon
or from the "Start" menu if a shortcut was previously created for an
application. Unknown applications should not be launched through the
desktop icon or the Start Menu. Shortcuts can be removed by using the
Java Web Start Application Manager through the "Application/Remove
Shortcut" menu item. For more information, see:
http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/ov
erview.html#jws
2. It is also possible to launch applications through the command line
in Windows. Unknown applications should not be launched through the
command line. Sites may consider renaming the Java Web Start launcher
("javaws.exe" for Windows) to prevent Java Web Start from launching.
The launcher can be found at:
Windows:
C:\Program Files\java\j2re1.5.0\javaws\javaws.exe
5. Resolution
This issue is addressed in the following releases:
Windows Platform
* Java Web Start in JDK and JRE 5.0 Update 12 or later
* Java Web Start in SDK and JRE 1.4.2_14 or later
J2SE 5.0 is available for download at the following link:
http://java.sun.com/j2se/1.5.0/download.jsp
J2SE 1.4.2 is available for download at the following link:
http://java.sun.com/j2se/1.4.2/download.html
Note: When installing a new version of the product, it is recommended
that the old affected versions be removed from your system. For more
information, please see:
http://java.com/en/download/help/uninstall_java.xml
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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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