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Category:   Application (Web Browser)  >   Netscape Vendors:   America Online, Inc., Netscape
Netscape Web Broswer Java Environment Lets Remote Malicious Applets Redirect Web Proxy Connections
SecurityTracker Alert ID:  1003732
SecurityTracker URL:  http://securitytracker.com/id/1003732
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Mar 4 2002
Impact:   Disclosure of system information, Host/resource access via network, Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.1, 6.0.1, and 6.0, 4.79 and earlier.
Description:   Sun Microsystems warned of a vulnerability in the Netscape Communicator and Netscape browsers, when used in a specific configuration. A remote user could cause proxy server sessions to be redirected.

It is reported that Sun's Java Runtime Environment, which is used in or included with Netscape, contains a flaw in the processing of Java requests for proxy resources. A remote user could create a malicious Java applet that could monitor requests to and responses from an HTTP proxy server when a persistent connection is used between a client and an HTTP proxy server.

The malicious Java applet could reportedly cause the proxy server to send packets to an alternate destination rather than the intended destination. The victim user would reportedly not be aware of the attack. This allows the remote user to impersonate other web sites.

Sun credits Harmen van der Wal with reporting this flaw.

Impact:   If Netscape is used with a web proxy server (any one), a remote user could create a malicious Java applet to cause the proxy server to send packets to an alternate destination rather than the intended destination. The victim user may not be aware of the attack.
Solution:   Netscape recommends that users upgrade to the latest Netscape software, available at:

http://home.netscape.com/computing/download/index.html

Netscape reports that Netscape 6.2 and 6.2.1 are not vulnerable, as they include fixed version of Sun's JVM plug-in.

Vendor URL:  home.netscape.com/security (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Sun Security Bulletin #00216


-----BEGIN PGP SIGNED MESSAGE-----

________________________________________________________________________________
                  Sun Microsystems, Inc. Security Bulletin
               
Bulletin Number:           #00216
Date:                      March 4, 2002
Cross-Ref:              
Title:                     HttpURLConnection
________________________________________________________________________________

The information contained in this Security Bulletin is provided "AS IS." 
Sun makes no warranties of any kind whatsoever with respect to the information 
contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS, 
REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR 
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE 
HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW.

IN NO EVENT WILL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY LOST REVENUE, 
PROFIT OR DATA, OR FOR DIRECT, SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL 
OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY 
ARISING OUT OF THE USE OF OR INABILITY TO USE THE INFORMATION CONTAINED IN 
THIS SECURITY BULLETIN, EVEN IF SUN MICROSYSTEMS, INC. HAS BEEN ADVISED OF 
THE POSSIBILITY OF SUCH DAMAGES.

If any of the above provisions are held to be in violation of applicable law, 
void, or unenforceable in any jurisdiction, then such provisions are waived 
to the extent necessary for this disclaimer to be otherwise enforceable in 
such jurisdiction.
________________________________________________________________________________

1. Background

   A vulnerability in the Java(TM) Runtime Environment may allow 
   an untrusted applet to monitor requests to and responses from
   an HTTP proxy server when a persistent connection is used between 
   a client and an HTTP proxy server.
   
   The full and custom installations of Netscape 6.1, 6.0.1, and 6.0 
   are affected since they include an affected version of the 
   Java Runtime Environment. The default Java runtime environments of 
   Netscape(TM) Communicator version 4.79 and earlier are affected. 
   For more information, see 
   
          http://home.netscape.com/security
   
   Microsoft VM up to and including build 3802 is affected.
   For more information, see 
   
          http://www.microsoft.com/technet/security/bulletin/MS02-013.asp
   
   This issue may or may not affect other vendors' Java technology
   implementations which are derived from Sun's SDK and JDK(TM) source bases. 
   Sun has notified and made the remedy available to its Java 
   technology licensees.

   Sun recommends that users of affected releases upgrade to the latest 
   SDK, JDK, and JRE releases listed in section 3 of this bulletin.

2. Affected Releases
   
   The following releases are affected:
     
   Windows Production Releases
   
     SDK and JRE 1.3.0_02 or earlier
     SDK and JRE 1.2.2_010 or earlier
     JDK and JRE 1.1.8_007 or earlier
   
   Solaris(TM) Operating Environment (OE) Reference Releases
   
     SDK and JRE 1.2.2_010 or earlier
     JDK and JRE 1.1.8_007 or earlier

   Solaris Production Releases
   
     SDK and JRE 1.3.0_02 or earlier
     SDK and JRE 1.2.2_10 or earlier     
     JDK and JRE 1.1.8_13 or earlier

   Linux Production Releases

     SDK and JRE 1.3.0_02 or earlier
     SDK and JRE 1.2.2_010 or earlier
   
   Releases prior to SDK and JRE 1.2.2, and JDK and JRE 1.1.8 for 
   Windows and Solaris are also affected and should no longer be used. 
   Users of these releases should upgrade to a later release listed in 
   Section 3.
   
   This vulnerability does not affect the Java 2 SDK, Standard Edition,
   versions 1.4 and 1.3.1.
     
3. Latest Releases

   Windows Production Releases
   
     SDK and JRE 1.4              http://java.sun.com/j2se/1.4/
     SDK and JRE 1.3.1_02       http://java.sun.com/j2se/1.3/
     SDK and JRE 1.2.2_011       http://java.sun.com/j2se/1.2/
     JDK and JRE 1.1.8_009
       http://java.sun.com/products/jdk/1.1/download-jdk-windows.html
       
   Solaris OE Reference Releases
   
     SDK and JRE 1.2.2_011       http://java.sun.com/j2se/1.2/
     JDK and JRE 1.1.8_009   
       http://java.sun.com/products/jdk/1.1/download-jdk-solaris.html

   Solaris OE Production Releases
   
     SDK and JRE 1.4              http://java.sun.com/j2se/1.4/
     SDK and JRE 1.3.1_02       http://java.sun.com/j2se/1.3/
     SDK and JRE 1.2.2_11       http://java.sun.com/j2se/1.2/
     JDK and JRE 1.1.8_15
       http://java.sun.com/products/jdk/1.1/download-jdk-solaris.html
       
   Linux Production Releases

     SDK and JRE 1.4              http://java.sun.com/j2se/1.4/
     SDK and JRE 1.3.1_02       http://java.sun.com/j2se/1.3/
     SDK and JRE 1.2.2_011       http://java.sun.com/j2se/1.2/     
_______________________________________________________________________________
Sun acknowledges, with thanks, Harmen van der Wal for bringing this issue to 
our attention. 
_______________________________________________________________________________
APPENDICES

A.  Sun security bulletins are available at:

    http://sunsolve.sun.com/security
       
B.  Sun Security Coordination Team's PGP key is available at:

    http://sunsolve.sun.com/pgpkey.txt
                                        
C.  To report or inquire about a security problem with Sun software, contact 
    one or more of the following:
  
        - Your local Sun answer centers
        - Your representative computer security response team, such as CERT 
        - Sun Security Coordination Team. Send email to:
        
                   security-alert@sun.com

D.  To receive information or subscribe to our CWS (Customer Warning System) 
    mailing list, send email to:
    
                  security-alert@sun.com
   
    with a subject line (not body) containing one of the following commands:

        Command         Information Returned/Action Taken
        _______         _________________________________

        help            An explanation of how to get information
        
        key             Sun Security Coordination Team's PGP key
       
        list            A list of current security topics

        query [topic]   The email is treated as an inquiry and is forwarded to 
                        the Security Coordination Team

        report [topic]  The email is treated as a security report and is
                        forwarded to the Security Coordination Team. Please 
                        encrypt sensitive mail using Sun Security Coordination
                        Team's PGP key

        send topic      A short status summary or bulletin. For example, to 
                        retrieve a Security Bulletin #00138, supply the 
                        following in the subject line (not body):
                      
                                send #138

        subscribe       Sender is added to our mailing list.  To subscribe, 
                        supply the following in the subject line (not body):

                                   subscribe cws your-email-address
                     
                        Note that your-email-address should be substituted
                        by your email address.
                     
        unsubscribe     Sender is removed from the CWS mailing list.
________________________________________________________________________________

Copyright 2002 Sun Microsystems, Inc. All rights reserved. Sun, 
Sun Microsystems, the Sun logo, Solaris, Java, and JDK are trademarks or 
registered trademarks of Sun Microsystems, Inc. in the United States and 
other countries. Netscape is a trademark or registered trademark of 
Netscape Communications Corporation in the United States and other countries.
This Security Bulletin may be reproduced and distributed, provided that this 
Security Bulletin is not modified in any way and is attributed to 
Sun Microsystems, Inc. and provided that such reproduction and distribution 
is performed for non-commercial purposes.

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