FAMOUS SLOWLORIS ATTACK SOFTWARE

One would except SERVER_BUSY_READ to intercept these as well, as the server is, in fact, still reading a request from the client and waiting for it to complete. One might wonder which state actually protects against the slow post attack variant. You can disable mod_antiloris when using this module. Not surprisingly, the attack stopped working after installing this mod. Not much different compared to the previous mods, except that mod_limitipconn takes into account all possible server states.

The extended version of the script can be found on Github.įunction attack_get ( $ server, $ host ) Based on a PHP version of the original Slowloris attack ( found here), I wrote a modified script which also included the new POST-based attack method. Luckily, in this case, the attack is devilishly simple. The first step in preventing and solving security problems lies in understanding the attack. I run Apache, so, naturally, I was (and still am) concerned about this attack vector. Also, recently, an alternative HTTP-based DOS method was found, using POST requests with a large content length ( article). Recently, the method was placed in the spotlights again, because both Wikileaks-supporters and non-supporters were using it to DOS a variety of websites and Wikileaks mirrors.

Verizon’s Motorola Set-Top Box (port 8082 and requires auth - unconfirmed).

Verizon’s MI424- WR FIOS Cable modem (unconfirmed).

Trapeze Wireless Web Portal (unconfirmed).

The attack is said to work on a large number of webservers, according to the project page: The server’s connection pool gets filled and no other clients can be served. The attack is HTTP-based, and attacks webservers by making lots of keep-alive connections and keeping them alive by sending bogus HTTP headers. Affected servers will keep these connections open, filling their maximum concurrent connection pool, eventually denying additional connection attempts from clients. Periodically, it will send subsequent HTTP headers, adding to-but never completing-the request. It accomplishes this by opening connections to the target web server and sending a partial request.

FAMOUS SLOWLORIS ATTACK SOFTWARE

Slowloris is a piece of software written by Robert “RSnake” Hansen which allows a single machine to take down another machine’s web server with minimal bandwidth and side effects on unrelated services and ports. Slowloris tries to keep many connections to the target web server open and hold them open as long as possible. If you are the least bit interested in network security, you’ll undoubtedly have heard about Slowloris by now. Slowloris And Mitigations For Apache Introduction

Famous slowloris attack