[NT] FastStone 4in1 Browser Directory Traversal

From: SecuriTeam (support_at_securiteam.com)
Date: 03/31/05

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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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