bugtraq - Unicode Buffer Overflow in WinFtp Server 1.6.8

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Date: Wed, 17 Aug 2005 13:44:35 -0000
From: "Donato Ferrante" <fdonato@...istici.org>
To: <bugtraq@...urityfocus.com>, <vuln@...unia.com>,
	<full-disclosure@...ts.grok.org.uk>, <bugs@...uritytracker.com>,
	<news@...uriteam.com>
Subject: Unicode Buffer Overflow in WinFtp Server 1.6.8

                           Donato Ferrante

Application:  WinFtp Server
              http://www.wftpserver.com

Version:      1.6.8

Bug:          Unicode Buffer Overflow

Date:         17-Aug-2005

Author:       Donato Ferrante
              e-mail: fdonato@...istici.org
              web:    www.autistici.org/fdonato

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1. Description
2. The bug
3. The code
4. The fix

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1. Description:
----------------

Vendor's Description:

"WinFTP Server is a multithreaded FTP server for Windows 98/NT/XP."

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2. The bug:
------------

The bug is located in the "Log To Screen" feature, this feature
allows the program to show server's log on screen.
By default the program has this function (called Log-SCR) enabled.
So a malicious user can trigger an unicode buffer overflow.

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3. The code:
-------------

To test the vulnerability send a request to the FTP server like:

aaa [1024 of a] aaa

and then scroll down the log screen, so the server will crash.

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4. The fix:
------------

Vendor has been contacted.
Bug will be fixed in the next release.

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