Syhunt: 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:
Advisory URL:

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

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 (/..\).


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:

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.

Credit: Felipe Aragon Syhunt Security Research Team,

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.