[1][USEMAP]
   [2][USEMAP]
   
   
     [3][LINK] 
   
   Allaire Security Bulletin (ASB00-29)
   JRun 2.3.3: Patch available for "JSP execution of arbitrary file"
   security issue
   
   Originally Posted: October 23, 2000
   Last Updated: October 23, 2000
   Summary
   
   Under certain circumstances, it is possible to insert executable code
   in the form of JSP tags and cause the code to be compiled and executed
   using JRun's handlers.
   Issue
   
   Submitting deliberately malformed input to an improperly secured
   application running on JRun 2.3.3 can allow an attacker to execute
   arbitrary and potentially malicious JSP code.
   
   For this issue to be exploited, an application must exist on the JRun
   server that takes browser input, unvalidated, and saves it to a file
   within the web document directory hierarchy. If the potential attacker
   can predict where in the hierarchy that file is, it can then be
   invoked by a deliberately malformed URI. The URI uses JRun's JSP
   servlet to invoke the target file as a JSP file.
   
   In this way, an attacker can contrive to invoke arbitrary JSP commands
   on the JRun server. It is possible that a determined attacker could
   gain administrative control of the server.
   
   Please note that this holds only for the included JRun http server,
   not any other vendor's web server.
   Affected Software Versions
     * JRun 2.3.3 (all editions)
       
   What Allaire is Doing
   
   Allaire has published this bulletin, notifying customers of the
   problem. Allaire has also released a patch that should resolve the
   issue in JRun 2.3.3. The patch is available for immediate download and
   application.
   
   JRun 2.3.3 users can find the patch for installation at the following
   URIs -- use the patch appropriate to your platform -- instructions for
   installation are included:
   
   Windows 95/98/NT/2000 and Windows NT Alpha:
   [4]http://download.allaire.com/jrun/jr233p_ASB00_28_29.zip
   
   UNIX/Linux patch - GNU gzip/tar:
   [5]http://download.allaire.com/jrun/jr233p_ASB00_28_29.tar.gz
   
   Please Note: The patch for ASB00-28 and ASB00-29 is identical. If you
   have already installed the patch for one, you do not need to install
   it for the other.
   
   It is recommended that you back up your existing data before applying
   any patch.
   What Customers Should Do
   
   Customers should download and apply the patch provided.
   
   Customers should also take this time to review the Allaire Security
   Best Practices document, '[6]Security Best Practice: Validating
   Browser Input', to help prevent this kind of security risk in general.
   
   Please note: As always, customers should test patch changes in a
   testing environment before modifying production servers.
   Acknowledgements
   
   Special thanks to Shreeraj Shah of [7]Foundstone, Inc. for bringing
   this issue to our attention.
   Revisions
   October 23, 2000 -- Bulletin first created. Reporting Security Issues
   Allaire is committed to addressing security issues and providing
   customers with the information on how they can protect themselves. If
   you identify what you believe may be a security issue with an Allaire
   product, please send an email to secure@allaire.com. We will work to
   appropriately address and communicate the issue.
   
   Receiving Security Bulletins
   When Allaire becomes aware of a security issue that we believe
   significantly affects our products or customers, we will notify
   customers when appropriate. Typically this notification will be in the
   form of a security bulletin explaining the issue and the response.
   Allaire customers who would like to receive notification of new
   security bulletins when they are released can sign up for our security
   notification service.
   
   For additional information on security issues at Allaire, please visit
   the Security Zone at:
   [8]http://www.allaire.com/security.
   THE INFORMATION PROVIDED BY ALLAIRE IN THIS BULLETIN IS PROVIDED "AS
   IS" WITHOUT WARRANTY OF ANY KIND. ALLAIRE DISCLAIMS ALL WARRANTIES,
   EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY
   AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ALLAIRE
   CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER
   INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF
   BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF ALLAIRE CORPORATION OR
   ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
   SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR
   CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY
   NOT APPLY.
   
   Allaire reserves the right, from time to time, to update the
   information in this document with current information.
   
   < a l l a i r e >
   Copyright © 1995-2000 Allaire Corp., All rights reserved.
   [9]Year 2000 (Y2K)    [10]Site problems?    [11]Service questions?
   [12]Privacy Policy

References

   1. LYNXIMGMAP:http://www.allaire.com/handlers/index.cfm?ID=17969&Method=Full#allaireHome
   2. LYNXIMGMAP:http://www.allaire.com/handlers/index.cfm?ID=17969&Method=Full#tools
   3. javascript:history.back()
   4. http://download.allaire.com/jrun/jr233p_ASB00_28_29.zip
   5. http://download.allaire.com/jrun/jr233p_ASB00_28_29.tar.gz
   6. http://www.allaire.com/Handlers/index.cfm?ID=14558&Method=Full
   7. http://www.foundstone.com/cgi-bin/display.cgi?Section_ID=13
   8. http://www.allaire.com/security
   9. http://www.allaire.com/developer/year2000
  10. mailto:webmaster@allaire.com
  11. mailto:info@allaire.com
  12. http://www.allaire.com/privacy/