" The bottom line is that unfortunately, no organization is immune to a data breach in this day and age." The preceding quotes from John Stewart, Cisco Senior Vice President and Chief Security Officer are eye opening considering that the miscreants are using the network infrastructure to financially impact organizations and diminish the purpose of this infrastructure. Clearly, we need new thinking and approaches to reducing the damage that cybercrime inflicts on the well-being of the world." We are approaching a tipping point where the economic losses generatedīy cybercrime are threatening to overwhelm the economic benefits created by information technology. " Cybercrime is no longer an annoyance or another cost of doing business. financial institutions-serve as a reminder that any cyber security threat has the potential to create significant disruption, and even irreparable damage, if an organization is not prepared for it." recent campaigns against a number of high-profile companies-including U.S. The following quotes and excerpts are from several high-profile individuals and organizations that are focused on defending networks from these types of attacks: The purpose of this white paper is to provide a number of tools, some or all of which may apply to a customer's environment, that can be part of an overall toolkit to help identify and mitigate potential DDoS attacks on customer networks. Tightening Connection Limits and Timeoutsĭenial of service (DoS) and distributed denial of service (DDoS) attacks have been quite the topic of discussion over the past year since the widely publicized and very effective DDoS attacks on the financial services industry that came to light in September and October 2012 and resurfaced in March 2013. Geographic Dispersion (Global Resources Anycast) Modern Tendencies in Defending Against DDoS Attacks Intrusion Prevention/Detection System Alarms Low Orbit Ion Cannon and High Orbit Ion Canon But in the end, if the attack is unmitigated, Slowloris-like the tortoise-wins the race.Introduction: The Case for Securing Availability and the DDoS ThreatĬategorization of DDoS Attacks and Problems Causedĭetailed Examples of DDoS Attacks and Tools The process can be further slowed if legitimate sessions are reinitiated. A Slowloris attack must wait for sockets to be released by legitimate requests before consuming them one by one.įor a high-volume web site, this can take some time. Named after a type of slow-moving Asian primate, Slowloris really does win the race by moving slowly and steadily. Ultimately, the targeted server’s maximum concurrent connection pool is filled, and additional (legitimate) connection attempts are denied.īy sending partial, as opposed to malformed, packets, Slowloris can easily slip by traditional Intrusion Detection systems. Periodically, the Slowloris sends subsequent HTTP headers for each request, but never actually completes the request. The attacked servers open more and connections open, waiting for each of the attack requests to be completed. It does this by continuously sending partial HTTP requests, none of which are ever completed. Slowloris works by opening multiple connections to the targeted web server and keeping them open as long as possible. Notably, it was used extensively by Iranian ‘hackivists’ following the 2009 Iranian presidential election to attack Iranian government web sites. Over the years, Slowloris has been credited with a number of high-profile server takedowns.
Slowloris has proven highly-effective against many popular types of web server software, including Apache 1.x and 2.x.
Due the simple yet elegant nature of this attack, it requires minimal bandwidth to implement and affects the target server’s web server only, with almost no side effects on other services and ports.
Slowloris attack preventions software#
Developed by Robert “ RSnake” Hansen, Slowloris is DDoS attack software that enables a single computer to take down a web server.
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