BEA WebLogic may reveal script source code by URL trickery
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Sverre H. Huseby security advisory #2, 2001-03-28



Systems affected
----------------

WebLogic 5.1.0 SP 8, and probably earlier versions.


Description
-----------

BEA WebLogic may be tricked into revealing the source code of JSP
scripts by using simple URL encoding of characters in the filename
extension.


Details
-------

It seems that the built in web server in WebLogic does URL decoding in
an unreasonable order.  URLs like the following

  http://someplace.com/index.js%70

where %70 is an URL encoded 'p', returns the source code of index.jsp
rather than running the script on the server side.

To speculate (read: guess): The JSP handler is skipped as this URL
does not end in ".jsp", but the static file handler is nevertheless
able to map the URL into a correct file name.


Impact
------

This design error makes it possible to fetch the source code of JSP
scripts.  Such source code may contain database passwords and file
names, and may reveal design errors or programming bugs that make it
possible to further exploit the server or service.



Reported by Sverre H. Huseby, shh@thathost.com