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AUSCERT External Security Bulletin Redistribution
ESB-2007.0286 -- [Win][Linux][Solaris]
Security Vulnerability With Java Web Start Related to
Incorrect Use of System Classes
1 June 2007
AusCERT Security Bulletin Summary
Product: Java 2 Platform, Standard Edition
Publisher: Sun Microsystems
Operating System: Windows
Impact: Increased Privileges
CVE Names: CVE-2007-2435
Revision History: June 1 2007: Added CVE-Name
May 2 2007: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102881
* Synopsis: Security Vulnerability With Java Web Start Related to
Incorrect Use of System Classes
* Category: Security
* Product: Java 2 Platform, Standard Edition
* BugIDs: 6461918
* Avoidance: Patch, Upgrade
* State: Resolved
* Date Released: 30-Apr-2007
* Date Closed: 30-Apr-2007
* Date Modified:
A security vulnerability in Java Web Start may allow an untrusted
application to elevate its privileges. For example, an application may
grant itself permissions to read and write local files that are
accessible to the user running the Java Web Start application.
Sun acknowledges, with thanks, the Fujitsu security team, for bringing
this issue to our attention.
2. Contributing Factors
This issue can occur in the following releases:
* Java Web Start in JDK and JRE 5.0 Update 10 and earlier for
Windows, Solaris and Linux
* Java Web Start in SDK and JRE 1.4.2_13 and earlier for Windows,
Solaris and Linux
To determine the version of Java installed on a system, the following
command can be used:
% java -fullversion
java full version "1.5.0_02-b09"
There are no reliable symptoms that would show the described issue has
To workaround this issue, users should avoid using Java Web Start with
untrusted applications, and may also wish to temporarily disable the
use of Java Web Start.
To disable Java Web Start applications from being automatically
launched from a web browser, the following steps can be performed:
For 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 "JNL - JNLP File"
5. Select the "JNLP - JNLP File" and click the "Delete" button
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
4. Select "application/x-java-jnlp-file" and click the "Remove"
Note 1: On Microsoft Windows, applications may also be launched from
the desktop icon or 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:
Note 2: It is also possible to launch applications through the command
line in Windows, Solaris, and Linux. Unknown applications should not
be launched through the command line. Sites may consider renaming the
Java Web Start launcher ("javaws.exe" for Windows and "javaws" for
Solaris and Linux) to prevent Java Web Start from launching.
The launcher can be found at:
Solaris (if installed using pkg):
Linux (if installed using rpm):
This issue is addressed in the following releases:
* Java Web Start in JDK and JRE 5.0 Update 11 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 links:
J2SE 5.0 Update 11 for Solaris is available in the following patches:
* J2SE 5.0: update 11 (as delivered in patch 118666-11 or later)
* J2SE 5.0: update 11 (as delivered in patch 118667-11 or
* J2SE 5.0_x86: update 11 (as delivered in patch 118668-11 or later)
* J2SE 5.0_x86: update 11 (as delivered in patch 118669-11 or
J2SE 1.4.2 is available for download at the following link:
Note: It is recommended that affected versions be removed from your
system. For more information, please see the installation notes on the
respective java.sun.com download page and the following for the
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
notification may only be used for the purposes contemplated by these
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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