__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Timing based attack vulnerabilities in the JAVA Secure Socket Extension [Sun Alert ID: 56380] September 2, 2003 18:00 GMT Number N-141 ______________________________________________________________________________ PROBLEM: A vulnerability exists in JAVA Secure Socket Extension (JSSE) where, under certain circumstances, an intruder can determine the security key used in SSL communications and use it to decrypt the communications and listen in to an encrypted conversation. Within that conversation is the login to the server. PLATFORM: Java JRE/SDK, Java Secure Socket Extension DAMAGE: 1) The intruder would be able to decrypt an SSL session. 2) Informaiton in an SSL session might give an intruder access to a user's account. SOLUTION: Apply patches as stated in Sun's Security Notification. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An unauthorized user could break into the ASSESSMENT: encrypted communications and gain user access. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-141.shtml ORIGINAL BULLETIN: http://www.sunsolve.sun.com/pub-cgi/retrieve.pl?doc= fsalert%2F56380&zone_32=category%3Asecurity ______________________________________________________________________________ [***** Start Sun Alert ID: 56380 *****] Sun(sm) Alert Notification Sun Alert ID: 56380 Synopsis: Timing Based Attack Vulnerabilities in the Java Secure Socket Extension Category: Security Product: Java JRE/SDK, Java Secure Socket Extension BugIDs: 4822311, 4841890 Avoidance: Upgrade State: Resolved Date Released: 28-Aug-2003 Date Closed: 28-Aug-2003 Date Modified: 1. Impact A vulnerability exists in Java Secure Socket Extension(JSSE) where it may be possible under certain circumstances to gather information about Cipher Block Chaining (CBC) encrypted data that is transmitted over a Secure Sockets Layer (SSL) or a Transport Layer Security (TLS) channel. This issue does not expose private or session keys. This issue is described in: * http://www.openssl.org/news/secadv_20030219.txt A second vulnerability exists where it may be possible under certain circumstances to extract private keys from an SSL server. This issue is described in: * http://crypto.stanford.edu/~dabo/abstracts/ssl-timing.html 2. Contributing Factors This issue can occur in the following releases: * JSSE in SDK and JRE 1.4.1_02 or earlier for Windows, Solaris and Linux * JSSE in SDK and JRE 1.4.0_04 or earlier for Windows, Solaris and Linux * JSSE 1.0.3_01 or earlier Note: JSSE in SDK and JRE 1.4.2 and later are not affected. 3. Symptoms There are no reliable symptoms that would show the described issues have been exploited. Solution Summary Top 4. Relief/Workaround There is no workaround. Please see the "Resolution" section below. 5. Resolution This issue is addressed in the following releases: * SDK and JRE 1.4.1_03 and later for Windows, Solaris, and Linux * JSSE 1.0.3_02 and later * SDK and JRE releases are available at: http://java.sun.com/j2se JSSE 1.0.3_02 is available at: * http://java.sun.com/products/jsse/index-103.html 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 2000-2003 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved. [***** End Sun Alert ID: 56380 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Sun Microsystems for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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