An update, here's IBM's (well, the guy works in IBM, but doesn't say whether
or not this is an official IBM response) response:

> -----Original Message-----
> From: Mike Turk []
> Sent: Monday, November 12, 2001 2:08 PM
> To: bugtraq
> Subject: Re: IBM AS/400 HTTP Server '/' attack
> Mailer: SecurityFocus
> In-Reply-To: <>
> It is possible through HTTP server and servlet engine configurations
> that HTML and/or JSP source could be view at the browser.
> HTTP Server There are configuration settings that could be made
> where JSP source could be displayed in the browser, such as
> placing JSPs in the document root of the HTTP server.  Also, in
> regards to html pages, if you use a PASS directive that allow all
> file types to be served
> (e.g. Pass /MYsamples/* /QIBM/UserData/MyHtml/*) then you
> could see the HTML source.  If the directive is qualified by file type
> (e.g. Pass /MYsamples/*.html /QIBM/UserData/MyHtml/*) you can prevent
> the request ending with '/' from being serviced.
> Servlet Engine:
> The problem description does not mention what Servlet
> engine/JSP processor
> that is being used.  If it is WebSphere, if you have a file serving
> servlet in your web application, it will try to service the
> request for
>  Like the PASS example
> above, if you
> limit the types of requests to be served my the simple file
> servlet by file type,
> you can prevent the source from being displayed.  To do so:
> 1.  select the simple file servlet for the web app.
> 2.  modify the URI in the servlet web path list.
>      a) start by modifying the existing URI.  It may look
> something like
> default_host/webapp/myapp/
>      b) change to something like  default_host/webapp/myapp/*.html
> 3.  Continue adding URIs for other file types (*.gif, etc...)
> 4.  Click Apply
> 5.  Restart the web application

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