bugtraq - ws_ftp overflow

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Date: 14 Mar 2004 21:41:30 -0000
From: john layman <john@...erteq.net>
To: bugtraq@...urityfocus.com
Subject: ws_ftp overflow

Product: WS_FTP Pro v8.02 and probably earlier versions.
Vendor:  Ipswitch

Vendor's Product Description:

WS_FTP Pro is the market leader in Windows-based FTP (file transfer protocol) client software. It enables users and organizations to move files between local and remote systems while enjoying the utmost in: 

Problem:

WS_FTP Pro suffers a buffer over-run when ASCII mode directory data is passed to the client from the server, and this data exceeds 260 bytes without a terminating CR/LF.  The application crashes with an error stating "instruction at 0xNNNNNNNN has addressed memory at ..." where 0xNNNNNNNN is a value in the overflowed buffer; suggesting that it is possible to cause WS_FTP Pro to continue execution at another location in memory - arbitrary code execution (?)

This problem can be demonstrated by creation of a long filename or directory name (250 bytes or more) in the ftp directory on the server, connecting to it and viewing the directory listing.  

Fix:  

Ipswitch was contacted about this problem, and version 8.03 appears to have solved it.  Update!