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SlowHTTPTest is a Application layer DoS Attack Simulator. SlowHTTPTest is a highly configurable tool that simulates some Application Layer Denial of Service attacks.It works on majority of Linux platforms, OSX and Cygwin - a Unix-like environment and command-line interface for Microsoft Windows. Following the release of the slowhttptest tool, I ran benchmark tests of some popular Web servers.My testing shows that all of the observed Web servers (and probably others) are vulnerable to slow http attacks in their default configurations. Reports generated by the slowhttptest tool illustrate the differences in how the various Web servers handle slow http attacks. SlowHTTPTest is a highly configurable tool that simulates some Application Layer Denial of Service attacks. It works on majority of Linux platforms, OSX and Cygwin - a Unix-like environment and command-line interface for Microsoft Windows. Sep 08, 2016 Download Slow HTTP Test for free. SlowHTTPTest Original files. SlowHTTPTest is a highly configurable tool that simulates some Application Layer Denial of Service attacks. It works on majority of Linux platforms, OSX and Cygwin - a Unix-like environment and command-line interface for Microsoft Windows.

Slowloris
Original author(s)	RSnake
Initial release	17 June 2009
Stable release	0.7
Written in	Perl
Platform	Cross-platform
Size	36 kb
Type	Hacking tool
Website	ha.ckers.org/slowloris/

Slowloris is a type of denial of service attack tool invented 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.

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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.^[1]

Affected web servers[edit]

This includes but is not necessarily limited to the following, per the attack's author:^[1]

Apache 1.x and 2.x
dhttpd
Websense 'block pages' (unconfirmed)
Trapeze Wireless Web Portal (unconfirmed)
Verizon's MI424-WR FIOS Cable modem (unconfirmed)
Verizon's Motorola Set-top box (port 8082 and requires auth - unconfirmed)
BeeWare WAF (unconfirmed)
Deny All WAF (patched) ^[2]
Flask (development server)

Because Slowloris exploits problems handling thousands of connections, the attack has less of an effect on servers that handle large numbers of connections well. Proxying servers and caching accelerators such as Varnish,nginx, and Squid have been recommended^[3] to mitigate this particular kind of attack. In addition, certain servers are more resilient to the attack by way of their design, including Hiawatha,^[4]IIS, lighttpd, Cherokee, and CiscoCSS.

Mitigating the Slowloris attack[edit]

While there are no reliable configurations of the affected web servers that will prevent the Slowloris attack, there are ways to mitigate or reduce the impact of such an attack. In general, these involve increasing the maximum number of clients the server will allow, limiting the number of connections a single IP address is allowed to make, imposing restrictions on the minimum transfer speed a connection is allowed to have, and restricting the length of time a client is allowed to stay connected. Photo cropping tool for mac for edv.

In the Apache web server, a number of modules can be used to limit the damage caused by the Slowloris attack; the Apache modules mod_limitipconn, mod_qos, mod_evasive, mod security, mod_noloris, and mod_antiloris have all been suggested as means of reducing the likelihood of a successful Slowloris attack.^[1]^[5] Since Apache 2.2.15, Apache ships the module mod_reqtimeout as the official solution supported by the developers.^[6]

Other mitigating techniques involve setting up reverse proxies, firewalls, load balancers or content switches.^[7] Administrators could also change the affected web server to software that is unaffected by this form of attack. For example, lighttpd and nginx do not succumb to this specific attack.^[1]

Notable usage[edit]

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During the protests that erupted in the wake of the 2009 Iranian presidential election, Slowloris arose as a prominent tool used to leverage DoS attacks against sites run by the Iranian government.^[8] The belief was that flooding DDoS attacks would affect internet access for the government and protesters equally, due to the significant bandwidth they can consume. The Slowloris attack was chosen instead, because of its high impact and relatively low bandwidth.^[9] A number of government run sites were targeted during these attacks, including gerdab.ir, leader.ir, and president.ir .^[10]

A variant of this attack was used by spam network River City Media to force Gmail servers to send thousands of messages en-bulk, by opening thousands of connections to the Gmail API with message sending requests, then completing them all at once.^[11]

Similar software[edit]

Since its release, a number of programs have appeared that mimic the function of Slowloris while providing additional functionality, or running in different environments:^[12]

PyLoris – A protocol-agnostic Python implementation supporting Tor and SOCKS proxies.^[13]
Slowloris – A Python 3 implementation of Slowloris with SOCKS proxy support.^[14]
Goloris – Slowloris for nginx, written in Go.^[15]
QSlowloris – An executable form of Slowloris designed to run on Windows, featuring a Qtfront end.^[16]
An unnamed PHP version which can be run from a HTTP server.^[17]
SlowHTTPTest – A highly configurable slow attacks simulator, written in C++.^[18]^[19]
SlowlorisChecker – A Slowloris and Slow POST POC (Proof of concept). Written in Ruby.^[20]
Cyphon - Slowloris for Mac OS X, written in Objective-C.^[21]
sloww - Slowloris implementation written in Node.js.^[22]
dotloris - Slowloris written in .NET Core ^[23]

References[edit]

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