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AUSCERT External Security Bulletin Redistribution
ESB-2007.0522 -- [Win][UNIX/Linux]
Security Vulnerability in Java Web Start URL Parsing Code
May Allow Untrusted Applications to Elevate Privileges
13 July 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Java 2 Platform, Standard Edition
Publisher: Sun Microsystems
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact: Execute Arbitrary Code/Commands
Access: Remote/Unauthenticated
CVE Names: CVE-2007-3504
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102996-1
Revision History: July 13 2007: Added CVE number
July 12 2007: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102996
* Synopsis: Security Vulnerability in Java Web Start URL Parsing
Code May Allow Untrusted Applications to Elevate Privileges
* Category: Security
* Product: Java 2 Platform, Standard Edition
* BugIDs: 6501487
* Avoidance: Patch, Upgrade
* State: Resolved
* Date Released: 10-Jul-2007
* Date Closed: 10-Jul-2007
* Date Modified:
1. Impact
A buffer overflow vulnerability in the Java Web Start URL parsing code
may allow an untrusted application to elevate its privileges. For
example, an application may grant itself permissions to read and write
local files or execute local applications with the privileges of the
user running the Java Web Start application.
Sun acknowledges with thanks, Brett Moore of Security-Assessment.com
for discovering and reporting this issue.
Sun also acknowledges eEye Digital Security for bringing this issue to
our attention.
2. Contributing Factors
This issue can occur in the following releases (for Windows, Solaris,
and Linux):
* Java Web Start in JDK and JRE 6 Update 1 and earlier
* Java Web Start in JDK and JRE 5.0 Update 11 and earlier
To determine the version of Java on a system, the following command
can be run:
% java -version
Note: Java Web Start in SDK and JRE 1.4.x are not affected by this
issue.
3. Symptoms
There are no reliable symptoms that would indicate the described issue
has been exploited.
4. Relief/Workaround
To reduce the likelihood of executing untrusted applications which may
allow this issue to be exploited, Java Web Start applications may be
disabled temporarily (until the updates or patches have been
installed) as follows:
For Internet Explorer (Windows):
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
For 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
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:
http://java.sun.com/j2se/1.5.0/docs/guide/javaws/developersguide/ov
erview.html#jws
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:
Windows:
C:\Program Files\java\j2re1.5.0\javaws\javaws.exe
Solaris (if installed using pkg):
/usr/bin/javaws
Linux (if installed using rpm):
/usr/java/jre1.5.0/bin/javaws
5. Resolution
This issue is addressed in the following releases (for Windows,
Solaris, and Linux):
* Java Web Start in JDK and JRE 6 Update 2 or later
* Java Web Start in JDK and JRE 5.0 Update 12 or later
Java SE 6 is available for download at the following links:
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))
J2SE 5.0 is available for download at the following link:
http://java.sun.com/j2se/1.5.0/download.jsp
J2SE 5.0 Update 12 for Solaris is available in the following patches:
* J2SE 5.0: update 12 (as delivered in patch 118666-12 or later)
* J2SE 5.0: update 12 (as delivered in patch 118667-12 or later
(64bit))
* J2SE 5.0_x86: update 12 (as delivered in patch 118668-12 or
later)
* J2SE 5.0_x86: update 12 (as delivered in patch 118669-12 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. To remove old affected versions on the
Windows platform, 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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