KPMG-2002020: Resin view_source.jsp Arbitrary File Reading

[Peter Gründl <pgrundl () kpmg dk>]

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Title: Resin view_source.jsp Arbitrary File Reading

BUG-ID: 2002020
Released: 17th Jun 2002
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Problem:
========
In a default installation of Resin server, the examples folder will
be installed as well. This folder contains a jsp script that can be
used to view arbitrary file contents with the permissions of the
web service.


Vulnerable:
===========
- view_source.jsp from Resin 2.1.2 standalone on Windows 2000 Server


Details:
========
The sample script view_source.jsp tries to chroot to the folder
where it is located. If you look at the sourcecode, it says:

"// Chroot to the current directory so no one can use this as a p
 // security hold"

Attempts to use /../ to break out of the examples folder are also
foiled by the script. However, if you replace the /../ with \..\
you can access any file on the drive that Resin has access to.


Vendor URL:
===========
You can visit the vendor webpage here: http://www.caucho.com


Corrective action:
==================
Remove the examples folder from your website.



Author: Peter Gründl (pgrundl () kpmg dk)

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