There are a handful of vendors that provide more advanced external DoS prevention technology based on research from the leading ISP’s traffic, behavior triggers, etc. Some IT groups will place a IPS outside the external firewall as a means to detect and prevent DoS attacks understanding any other attack besides DoS is probably not a import item to be alerted to since its external to the network. Many firewalls have DoS detection and prevention settings. External defenses typically are tools placed between the ISP and your network gateway or capabilities enabled on your gateway equipment. To use this tool, you simply put in the target URL or IP and specify what and how often you want to send traffic.ĭefending against both Internal and External DoS attacks is slightly different. Like SlowLoris, the attacker doesn’t have to understand how the tool works yet still be able to disrupt service by simply pointing LOIC at a target and launching the attack.
LOIC was designed as a stress testing tool and can take out systems by sending a large sequence of UDP, TCP or HTTP requests to the target. Taking out a website (blurred) with SlowLotusĪnother DoS tool is Low Hanging Ion Canon aka LOIC. This causes the target to be caught up with the existing request delaying responses to legitimate traffic. The tool continues to send several hundred subsequent headers at regular intervals to keep sockets from closing overwhelming a target’s resources. Slowloris holds connections open by sending partial HTTP requests to a target. Slowloris is a low bandwitdth HTTP client used for issuing DoS attacks not using common flooding techniques. How easy is it for the average Joe to execute a DoS attack? There are tools available that can be used by a disgruntled employee to cause real havoc yet don’t require expert level knowledge. Terms such as Smurff or Tear Drop attacks are just some of the many methods to disrupt internal networking. Internal attacks range from sending malformed traffic at a router to exploiting weaknesses in systems. The term DDoS references this distributed concept covered in this post HERE. The most common from of external DoS is through overloading a target with many machines typically through a Botnet or remotely controlled army of computers. In general, there are two areas you will see these attacks, which are External and Internal. This can be accomplished through many methods ranging from compromising servers to disrupting a core component such as a network gateway. A Denial of Service attack basically comes down to stopping a system or service from functioning. I have spoke about this topic in the past however will provide both the executing and defending side of DoS in this post. I have recently seen a uptick in DDoS / DoS attacks against my customers and asked questions such as “how easy is it to perform these attacks?”, “who launches these attacks?” and “how can I defend against such attacks?”.
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