It takes down the server slowly but have huge effect on the server. Apache server is thread based means once we use Slowloris on Apache,the server would get wait for the client request for completing connection but the client would keep delaying that and hence server process threads would stay busy with the incomplete headers by the attacker and the legit users will not be able to use the resources on the web server.īut why Apache?Not just Apache is getting hurt by the attack but there are plenty more web server which have a specific architecture based on which they are being attacked by Slowloris. This tool is specially crafted for certain vulnerability with servers which use process thread. Slowloris tries to keep the multiple connection open for a long period of time with the server. The server have to hold the connection and waits for the complete header from the client but client never sends that instead the client send spurious header and this set timeout counters with each incomplete request. It holds the connection open while sending incomplete HTTP request. Slowloris sends partial HTTP request,and none of them are completed. It require minimal bandwidth and works on only web-servers. This tool can work as a single soldier to take down the web server. This is an HTTP dos attack tool not a TCP dos tool but it does make a legit TCP connection with the victim server. It is a Dos attack tool for web servers developed by Robert “RSnake” Hansen and was announced on the blog ha. in 2009. One of those tools that we are going to discuss right now is Slowloris. But a nice tool is the one which can go undetected for longer and can give really appreciative results.
Like if we talk about Pyloris(http Based), LOIC(TCP,UDP,Http), R-U-DEAD-YET( targets the web server resources) and many others. There are many tools out there for the Dos purpose, which also varies in the type of platform they effect. In this article, we are looking at how Dos attack works.
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