===================================================================== CERT-Renater Note d'Information No. 2007/VULN275 _____________________________________________________________________ DATE : 03/07/2007 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Systems running Java Web Start. ====================================================================== 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 ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================