Denial of Service (DoS) Attack Protection Project Presentation Submitters: Victoria Tchoudakov 309446300 Alexey Tsitkin 306371741 Sergey Ogurtsov 321653610. DoS Attacks:. SYN attack Teardrop attack. SYN Attack. In TCP protocol way to open connection is “tree way handshake”:
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Victoria Tchoudakov 309446300
Alexey Tsitkin 306371741
Sergey Ogurtsov 321653610
Client sends to Server packet with syn bit=1, Server answers with packet with syn bit=1 and ack bit=1. Now client has to answer by packet with ack bit =1, and this is the point when TCP session is opened.
Teardrop attack uses vulnerability in the way fragmented IP packets are reassembled. Fragmentation is necessary when IP datagrams are larger than the maximum transmission unit (MTU) of a network segment across which the datagrams must traverse. In order to successfully reassemble packets at the receiving end, the IP header for each fragment includes an offset to identify the fragment's position in the original unfragmented packet. In a Teardrop attack, packet fragments are deliberately fabricated with overlapping offset fields causing the target host to hang or crash when it tries to reassemble them.
One for Client-to-Server communication, the other for Server-to-Client communication.