[NT] Falcon Web Server Authentication Circumvention Vulnerability

From: support@securiteam.com
Date: 02/16/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sat, 16 Feb 2002 17:43:00 +0100 (CET)

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  Falcon Web Server Authentication Circumvention Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://www.blueface.com/> Falcon Web Server is an ISAPI and WinCGI
supporting web server running on the Microsoft Windows OS's. A security
vulnerability in the product allows bypassing of the server's security
restrictions by requesting a specially formed URL request.

DETAILS

Vulnerable systems:
Flacon Web Server 2.0.0.1020 and prior

Immune systems:
Flacon Web Server 2.0.0.1021

Falcon Web Server supports virtual directory mapping and allows the server
administrator to use a user-authentication scheme to protect the content
of these directories. Due to a problem in the parsing of requests made to
such directories it is possible to circumvent this authentication scheme
and access any file in a protected directory without supplying the proper
credentials.

The attack consists of adding an additional backslash at the beginning of
the virtual path. For example, the server comes with one such path to a
directory 'test' pre-configured, which requires authentication to be
accessed. A direct request to this directory ('http://server/test/')
without supplying the proper credentials will return a 401 Unauthorized
error. Requesting the same directory as 'http://server//test/' however,
will allow the user access without authenticating.

Solution:
The vendor has been notified and has addressed this issue by releasing
build 2.0.0.1021 for the Falcon Web Server Standard and SSL editions. This
has been tested against Falcon Web Server builds 2.0.0.1009 and 2.0.0.1020
on Win2k.

ADDITIONAL INFORMATION

The information has been provided by
<mailto:vuln-dev@labs.secureance.com> Strumpf Noir Society.

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