This article will guide you on how the ACK scan DOS #attack works as well as methods to mitigate this.
A port scan can help an attacker find a weak point to attack and break into a computer system.
Just because you've found an open port doesn't mean you can attack it. But, once you've found an open port running a listening service, you can scan it for vulnerabilities.
Denial of service attack (DOS) is an attack against computer or network which reduces, restricts or prevents accessibility of its system resources to authorized users. The network of Bots is called botnet.
A Fraggle Attack is a denial-of-service (#DoS) attack that involves sending a large amount of spoofed UDP traffic to a router's broadcast address within a network.
It is very similar to a Smurf Attack, which uses spoofed ICMP traffic rather than UDP traffic to achieve the same goal.
Common DoS attacks:
1. Buffer overflow attacks – the most common DoS attack.
2. ICMP flood – leverages misconfigured network devices by sending spoofed packets that ping every computer on the targeted network, instead of just one specific machine.
3. SYN flood – sends a request to connect to a server, but never completes the handshake.
To prevent port scan attacks:
i. Install a Firewall: A firewall can help prevent unauthorized access to your private network.
ii. TCP Wrappers: TCP wrapper can give administrators the flexibility to permit or deny access to the servers based on IP addresses or domain names.