wp-02-0001: GoAhead Web Server Directory Traversal + Cross Site Scripting

[Matt Moore <matt () westpoint ltd uk>]

Westpoint Security Advisory

Title:        GoAhead Web Server Directory Traversal + Cross Site Scripting
Risk Rating:  Medium
Software:     GoAhead Web Server v2.1
Platforms:    Windows NT/98/95/CE
            Embedded Linux
            Linux
            QNX
            Novell Netware + others

Vendor URL:   www.goahead.com/webserver/webserver.htm
Author:       Matt Moore <matt () westpoint ltd uk>
Date:         10th July 2002
Advisory ID#: wp-02-0001

Overview:
=========
GoAhead is an open source 'embedded' web server. Apparently used in various
networking devices from several blue chip companies.

( http://www.goahead.com/webserver/customers.htm )

Details:
========

Cross Site Scripting via 404 messages.
--------------------------------------

GoAhead quotes back the requested URL when responding with a 404. Hence it
is possible to perform cross-site scripting attacks, e.g:

GoAhead-server/SCRIPTalert(document.domain)/SCRIPT

Read arbitrary files from the server running GoAhead(Directory Traversal)
-------------------------------------------------------------------------

GoAhead is vulnerable to a directory traversal bug. A request such as

GoAhead-server/../../../../../../../ results in an error message
'Cannot open URL'.

However, by encoding the '/' character, it is possible to break out of the
web root and read arbitrary files from the server.
Hence a request like:

GoAhead-server/..%5C..%5C..%5C..%5C..%5C..%5C/winnt/win.ini returns the
contents of the win.ini file.

Vendor Response:
================
I was unable to obtain any response from GoAhead technical support 
regarding
the identified issues.

Patch Information:
==================
No vendor response, so unsure if fixed version available.

Security History:
=================

http://www.securiteam.com/securitynews/5QP010U3FS.html - Directory 
Traversal
http://www.securiteam.com/securitynews/5IP0E2K41I.html - Denial of Service
http://www.securiteam.com/windowsntfocus/5LP040A3RS.html - Denial of 
Service

This advisory is available online at:

http://www.westpoint.ltd.uk/advisories/wp-02-0001.txt