===================================================================== CERT-Renater Note d'Information No. 2007/VULN219 _____________________________________________________________________ DATE : 02/05/2007 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Systems running Sun Java Web Start. ====================================================================== 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: 1. Impact 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" 3. Symptoms There are no reliable symptoms that would show the described issue has been exploited. 4. Relief/Workaround 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 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/developersguid e/overview.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: * 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: * http://java.sun.com/j2se/1.5.0/download.jsp 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 later (64bit)) * 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 later (64bit)) J2SE 1.4.2 is available for download at the following link: * http://java.sun.com/j2se/1.4.2/download.html 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 Windows platform: * 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 + =========================================================