NicoFTP Stack Overflow
/*
* Name: NicoFTP Stack Overflow
* Version: 3.0.1.19
* Developer: NicoSW
* Developer site: www.nicosw.com (Offline)
* Developer contact: nicoftp[at]nicosw[dot]com
* Discovered by: K4P0 <k4p0k4p0[at]hotmail[dot]com>
* Founded: 12/29/2005 (MM/DD/YYYY)
* Published: 01/01/2006 (MM/DD/YYYY)
*/
-- Intro
NicoFTP is a Freeware, ligth, simple and fast FTP client program. This bug
affects this software on version 3.0.1.19 and erlier ones.
-- Bug
A simple stack overflow.
-- Fix
It isn't an open-source software, but it could be fixed by checking the length
of the personalizable name of the FTP site before storing it into memory.
-- Exploit
A new FTP (or modify) account must be created; when filling the 'Name of site'
, write 4101 random characters, then write 4 characters more that will produce
the Stack Overflow by trying to access to that address.
It's a better idea to modify the 'Name' value through the Sites.conf.(The
'Name' field it's located between [ ]).
I didn't have success by trying to make the exploit, because it executes many
instructions using registers that are also overwrited, so when it trys to read
the address form the registers (precisely eax & ebx) it goes to a nonexisten
address, such as 0x41414141.
I tryed to modify the addresses where the registers pointed at, but it's almost
impossible.
As a proof of concept you can try to write a string in the corresponding field
taking care how many characters you write; if you wanna try, follow the above
instructions.
You can find a string I made in :
www.usuarios.lycos.es/altohack/adv/NicoFTPProof.txt