By Bastian Ballmann
This ebook explains the right way to see one's personal community during the eyes of an attacker, to appreciate their ideas and successfully guard opposed to them. via Python code samples the reader learns to code instruments on matters reminiscent of password sniffing, ARP poisoning, DNS spoofing, SQL injection, Google harvesting and Wifi hacking. moreover the reader might be brought to safeguard equipment comparable to intrusion detection and prevention structures and log dossier research by means of diving into code.
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5, because the additional security of a modern, tagged VLAN on the one hand depends on a header added to the packet including the VLAN Id. Such a packet can be easily created with Scapy. Lets say our computer is connected to VLAN 1 and wants to ping another one on VLAN 2. 3") / \ ICMP() sendp(packet) First we set the header including our VLAN tag into the packet and afterwards the one of the destination host. The switch will remove the first tag, than decide how to react on the packet, seeing the second tag with VLAN Id 2 he decides to forward it to that vlan.
Stealthy attackers would use another tactic. A computer that wants to get knowledge about an IP address asks with an ARP request. We will write a program that waits for ARP requests and sends a spoofed ARP response for every received request. In a switched environment this will result in every connection flowing over the computer of the attacker, because in every ARP cache there will be the attackers MAC for every IP address. This solution is more elegant and not as noisy as the one before, but still quite easy to detected for a trained admin.
Therefore we provide the packet from the previous layer to the decoder, though IPDecoder gets the ETH packet, the TCPDecoder an IP packet and so forth. The payload of the IP packet can be accessed as an ASCII-string with the help of the method get_data_as_string(), which sometimes leads to ugly undisplayable characters, especially when dumping binary data. Therefore we first match the payload against a regular expression (Sect. 9) to make sure it contains a string like User, Pass, Password or Login.