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TUCoPS :: Web :: Apps :: n-141.txt

Timing based attack vulnerabilities in the JAVA Secure Socket Extension (CIAC N-141) JAV:





             __________________________________________________________

                       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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