Buffer overflow in Microsoft ftp.exe

From: aT4r InsaN3 (at4rat_private)
Date: Wed Apr 30 2003 - 01:34:21 PDT

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    There is a Buffer overflow in the raw quote command in the Microsoft Windows 
XP ftp.exe

just type:

quote AAAAAAAAA....[517 chars]...AAAAAAAAAAAA
ftp.exe will crash

after several checks i was unable to exploit this vulnerability remotely but 
maybe there are other bugs in the way that ftp.exe manages the buffer of 
server replyes.


An attack scenario can be the following:

a Windows workstation/server that executes commands like this one: at 
/next:xxxxxx ftp -s:scriptfile

if an attacker with axx to the system is able to modify the scriptfile he 
can modify the script and place an evil command Quote AAAAAA..SHELLCODE... 
and execute code with elevated privileges.


tested in ftp.exe v 5.1.2600.1106 WINXP SP1 Spanish version
fix: check file permisions with cacls.

at4r [at] 3wdesign.es Security


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