[NT] Apache Tomcat Denial of Service (NULL)

From: support@securiteam.com
Date: 06/21/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Fri, 21 Jun 2002 07:06:46 +0200 (CEST)

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  Apache Tomcat Denial of Service (NULL)
------------------------------------------------------------------------

SUMMARY

Apache's <http://jakarta.apache.org/> Tomcat has been found to contain a
vulnerability that would allow a malicious user to tie up all 75 working
threads and cause a Denial of Service situation.

DETAILS

Vulnerable systems:
 - Apache Tomcat 4.0.3 on Windows 2000 Server

Immune systems:
 - Apache Tomcat 4.1.3 beta on Windows 2000 Server

By sending a large amount of null characters to the web service it is
possible to cause a working thread to hang. The default installation has
75 working threads, which means this malformed request has to be sent to
the server 75 times.

Vendor Response:
This was reported to the vendor on the 23rd of May, 2002. We never heard
back from the vendor. On the 10th of June, 2002, the issue was confirmed
fixed in the latest build.

Corrective action:
Upgrade to V4.1.3 beta, which is available here:
 
<http://jakarta.apache.org/builds/jakarta-tomcat-4.0/release/v4.1.3-beta/>
http://jakarta.apache.org/builds/jakarta-tomcat-4.0/release/v4.1.3-beta/

ADDITIONAL INFORMATION

The information has been provided by <mailto:pgrundl@kpmg.dk> Peter
Gründl.

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