防護Apache受攻擊(Slowloris)..._Protect Apache Against Slowloris Attack !
Slowloris allows a single machine to take down another machine’s web server with minimal bandwidth and side effects on unrelated services and ports. The tools used to launch Slowloris attack can be downloaded at http://ha.ckers.org/slowloris/
Slowloris tries to keep many connections to the target web server open and hold them open as long as possible. It accomplishes this by opening connections to the target web server and sending a partial request. Periodically, it will send subsequent HTTP headers, adding to—but never completing—the request. Affected servers will keep these connections open, filling their maximum concurrent connection pool, eventually denying additional connection attempts from clients.
Following web server has been tested and NOT affected by this kind of attack:
Since Apache is vulnerable to this attack, we should do some prevention. We need to install one Apache module called mod_antiloris. The module limits the number of threads in READ state on a per IP basis and protecting Apache against the Slowloris attack. Installation instruction as below:
1. Download the installer and install from Sourceforge.net: