Syhunt Advisory: Visual Synapse HTTP Server Directory Traversal
Vulnerability

Advisory-ID: 201010071
Discovery Date: 09.07.2010
Release Date: 10.07.2010
Affected Applications: Visual Synapse HTTP Server 1.0 RC3, 1.0
RC2, 1.0 RC1, 0.60 and previous releases; And any applications
using the Visual Synapse HTTP Server component
Class: Directory Traversal
Status: Unpatched/Vendor informed
Vendor: Rene Tegel
Vendor URL: http://sourceforge.net/projects/visualsynapse/
Advisory URL: http://www.syhunt.com/advisories/?id=vs-httpd-dirtrav

The Common Vulnerabilities and Exposures (CVE) project has
assigned the following CVE to this vulnerability: CVE-2010-3743

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Overview:
Visual Synapse HTTP Server is an open source HTTP server and
also server component for Delphi, Freepascal and C++ Builder
developed by Rene Tegel. The server supports PHP, Perl and CGI
and is distributed both as source and as precompiled binary.

Description:
A vulnerability in the Visual Synapse HTTP server allows remote
attackers to traverse directories on the system. This is
possible by sending a specially-crafted URL request containing
"dot dot" sequences (/..\).

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Details:

Example 1:
GET /..\..\..\..\windows/system.ini HTTP/1.0

Example 2:
GET /..\..\..\boot.ini HTTP/1.0

Note: the server was installed in the "C:\Server\VSHTTPD\"
directory.

Sandcat can also be used to identify this issue:
http://www.syhunt.com/sandcat

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Vulnerability Status:

The vendor was notified, but no reply has been received.

The source code of the server warns about possible security
issues and that it is not suitable for production environments
yet. This warning must be taken seriously.

Any application using this source is vulnerable unless the code
is patched. Any machine running the compiled HTTPD Server demo
is vulnerable as well, unless the application is replaced with
an up-to-date and patched version.

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Credit:
Felipe Aragon
Syhunt Security Research Team, www.syhunt.com

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Copyright © 2010 Syhunt Security

Disclaimer:
The information in this advisory is provided "as is" without
warranty of any kind. Details provided are strictly for
educational and defensive purposes.

Syhunt is not liable for any damages caused by direct or
indirect use of the information provided by this advisory.