[NT] FastStone 4in1 Browser Directory Traversal

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To: list@securiteam.com
Date: 31 Mar 2005 11:10:09 +0200

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  FastStone 4in1 Browser Directory Traversal
------------------------------------------------------------------------

SUMMARY

" <http://www.faststone.org/> FastStone 4in1 Browser is a FREE
multi-window Web Browser with a built-in Web Server, a fully functional
FTP Client and a drag & drop Image Viewer"

FastStone 4in1 Browser does not properly sanitize the directory reference
found inside URLs, this allows an attacker that is able to lure a user to
enter to his web site to read files that reside on the user's computer.

DETAILS

Vulnerable Systems:
 * FastStone 4in1 Browser version 1.2

Immune Systems:
 * FastStone 4in1 Browser version 1.3

The program by default has some checks to avoid malicious patterns like
"/../" found in HTTP requests, but it doesn't filter out patterns like:
"\..\", "../" or "/.../".

By utilizing the directory traversal vulnerability an attacker that can
lue a user to access his web site is able to see and download all the
files on the user's system.

Examples:
http://[host]/.../.../.../.../.../.../windows/system.ini
http://[host]/..\..\..\..\..\..\..\..\windows/system.ini

ADDITIONAL INFORMATION

The information has been provided by <mailto:fdonato@autistici.org>
Donato Ferrante".

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