Distributed Denial of Service Attacks Shankar Saxena Veer Vivek Kaushik.

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Presentation transcript:

Distributed Denial of Service Attacks Shankar Saxena Veer Vivek Kaushik

Agenda Introduction and Famous Attacks How Attack Takes Place Types of DDOS Attacks Smurfing UDP Flooding TCP SYN Flooding

Introduction Causes service to be unusable or unavailable Coordinated mass scale attack from compromised computers Exhaust bandwidth, router processing, network stack resource Hard to detect at firewall level

Famous Attacks February 2000 Yahoo, Ebay, Amazon websites attacked Yahoo received packet traffic which some websites receive in 1 year 1 billion dollars October of 13 DNS root servers attacked Attack on internet itself

Scanning (Step 1) Port Scanning Search for open ports NMap  Send packets to target to interact  TCP Connect, TCP SYN, UDP, Software Vulnerabilities Common & Default Configuration Weaknesses Nessus  Plugin  Windows, Backdoor, File Sharing, Firewalls, Mail Servers

Stack based Buffer overflow (Step 2) Attacker chooses most vulnerable machines. Buffer overflow occurs when attacker store too much data in undersize buffer. Attacker precisely tune the amount and content of data. Attacker overwrites the return pointer with his own, which points to his code.

Function arguments Return pointer Buffer(Local variable) Bottom of memory Normal Stack Fill Direction

New pointer Attacker machine code Buffer(Local variable) Bottom of memory Function arg Top of memory Fill direction Smashed Stack

Rootkit & Attack (Step 3) Rootkit To get back into compromised system Replace system file with there Trojan version Attack Instruct compromised systems to attack Various flooding methods

DDoS attack

Kinds of Attacks Smurfing UDP Flooding TCP Syn Flooding

Smurfing Attacker sends packet to Network amplifier with return address spoofed to victim IP address Attacking packets are typically ICMP echo request This request generate ICMP echo reply which will flood the victim

TCP SYN Attack Exploits Three way handshaking protocol. Large number of bogus TCP Sync request are sent to victim in order to tie up its resources. No Ack+Syn responses are returned, Server run out of memory resources

TCP SYN Attack

UDP Flooding Connectionless protocol No 3 way handshaking is required Large number of UDP packets saturate the Network and deplete the bandwidth.

DDoS Counter Measures Egress filtering Scanning packets for certain criteria Spoofed address Close all unneeded ports Be More aware Install new patches Check server logs Test scanning tools on your system

Thanks Queries?