The default servlet (org.apache.catalina.servlets.DefaultServlet) in Tomcat 4.0.4 and 4.1.10 and earlier allows remote attackers to read source code for server files via a direct request to the servlet.
http://www.redhat.com/support/errata/RHSA-2002-218.html
http://www.redhat.com/support/errata/RHSA-2002-217.html
http://www.iss.net/security_center/static/10175.php
http://www.debian.org/security/2002/dsa-170