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Category:   Application (Web Server/CGI)  >   Apache Tomcat Vendors:   Apache Software Foundation
Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1022331
SecurityTracker URL:  http://securitytracker.com/id/1022331
CVE Reference:   CVE-2009-0033   (Links to External Site)
Date:  Jun 4 2009
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 4.1.0 to 4.1.39, 5.5.0 to 5.5.27, 6.0.0 to 6.0.18
Description:   A vulnerability was reported in Apache Tomcat. A remote user can cause denial of service conditions.

A remote user can send a request with specially crafted headers via the Java AJP connector to cause the target mod_jk load balancing worker to be blocked for approximately one minute.

A demonstration exploit request is provided:

GET /servlets-examples/ HTTP/1.1
Host: localhost:x

Yoshihito Fukuyama reported this vulnerability.

Impact:   A remote user can cause temporary denial of service conditions.
Solution:   The vendor has issued a fix (6.0.20). The fix will be included in future versions 4.1.40 and 5.5.28.
Vendor URL:  tomcat.apache.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Sep 21 2009 (Red Hat Issues Fix for JBoss) Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
Red Hat has released a fix for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 4 and 5.
Oct 14 2009 (Red Hat Issues Fix for JBoss) Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
Red Hat has released a fix for Tomcat6 for JBoss Enterprise Web Server 1.0.0 for Red Hat Enterprise Linux 4 and 5.
Nov 10 2009 (Red Hat Issues Fix) Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Application Server v2.
Dec 1 2009 (Red Hat Issues Fix for Red Hat Network Satellite Server) Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Network Satellite Server 5.2 and 5.3.
Dec 1 2009 (Red Hat Issues For for Red Hat Network Satellite Server) Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Network Satellite Server 5.1.
Nov 24 2010 (HP Issues Fix for HP-UX) Tomcat Java AJP Connector Header Procesing Bug Lets Remote Users Deny Service
HP has issued a fix for HP-UX 11.23 and 11.31.



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