On Thu, 31 Oct 2002, Paul Copeland wrote:

> Starting with Tomcat 4.1.12 the old style servlet URL's
> "app/servlet/class-path" are no longer available in the default
> web.xml configuration.
>
> This can be a problem for "legacy" servlet applications, for
> instance web pages with hyperlinks that use the old style URL would
> suddenly stop working with 4.1.12 Tomcat.
>
> You can turn old-style servlet URL's back on (see Tomcat release
> notes) but then your servlet container is vulnerable to a documented
> security hole (which is why it is off by default now).
[ ... ]

I don't believe this is quite accurate.  It's true there was a
vulnerability found in Tomcat versions 4.0.5 (and earlier 4.0.*
versions) and Tomcat 4.1.12 (and earlier 4.1.* versions).  But I
believe later versions in those series have had this vulnerability
fixed -- that is, you can leave the invoker servlet enabled and not be
susceptible to this vulnerability.  (The invoker servlet is what
allows the use of the .../app/servlet/class-path URL's.)  Check the
docs/release notes to be sure.

Milt Epstein
Research Programmer
Integration and Software Engineering (ISE)
Campus Information Technologies and Educational Services (CITES)
University of Illinois at Urbana-Champaign (UIUC)
[EMAIL PROTECTED]

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