Macromedia JRun Server Bug In Parsing XML DTDs May Let Remote Users Crash the Server
SecurityTracker Alert ID: 1005805|
SecurityTracker URL: http://securitytracker.com/id/1005805
(Links to External Site)
Date: Dec 13 2002
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
A denial of service vulnerability was reported in Macromedia's JRun server. A remote user can cause the server to consume all available CPU resources.|
It is reported that if the server's SOAP interfaces are presented with a malformed XML message, the XML parser (either Crimson or Xerces) may enter a processing loop that will exhaust CPU resources.
A similar vulnerability [or potentially the same vulnerability] was recently reported in BEA's WebLogic. In that report [also credited to Sanctum, Inc.] it was reported that a remote user could create specially crafted entity references in an XML Document Type Definition (DTD) to cause the Xerces parser to consume all available processing resources and crash.
Macromedia credits Sanctum, Inc. with reporting this flaw.
A remote user may be able to cause the service to consume all available resources and crash.|
The vendor has released a patch, available at:|
Macromedia indicates that you should apply the changes by downloading the .zip file and extracting 'webservices.jar'. Then, you should stop the JRun 4.0 server and apply the jar file to an existing installation of JRun 4.0 in the '/jrun4/lib' directory.
For more information, see the Vendor URL.
Vendor URL: www.macromedia.com/v1/handlers/index.cfm?ID=23559 (Links to External Site)
Exception handling error, Input validation error|
Source Message Contents
Subject: New Macromedia Security Zone Bulletins Posted|
Several security issues that may affect Macromedia JRun and
ColdFusion customers have come to our attention recently.
To learn about these new issues and what actions you can
take to address them, please visit the Security Zone at
the Macromedia website:
MSPB02-14 - Patch available for web services denial-of-service vulnerability in JRun 4.0 and ColdFusion MX.
Originally Posted: December 11, 2002
Web services in JRun 4.0 and ColdFusion MX products are vulnerable to a denial of service attack by passing incorrectly formed messages
to the SOAP interfaces exposed by ColdFusion MX and JRun. Both products use an XML parser (either Crimson or Xerces) that can
be made to run in an almost infinite loop with this specially form message - exhausting CPU resources.
WHAT CUSTOMERS SHOULD DO:
We strongly encourage customers to download and install this patch immediately.
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