This attack amplifies the server load so you need to create a significant load on the server. When we send a HEAD request to the server, it processes the PHP to generate headers. What happens when we do 2 Requests for an apache server using pipelining?
<?php sleep(2); ?> linux-7nli:/home/xianur0 # netcat -vvv localhost 8080 localhost [127.0.0.1] 8080 (http-alt) open HEAD /sleep.php HTTP/1.1 Host: localhost:8080 HEAD /sleep.php HTTP/1.1 Host: localhost:8080 [4 sec. later] HTTP/1.1 200 OK Date: Fri, 26 Aug 2011 03:49:50 GMT Server: Apache/2.2.17 (Linux/SUSE) X-Powered-By: PHP/5.3.5 Content-Type: text/html HTTP/1.1 200 OK Date: Fri, 26 Aug 2011 03:49:52 GMT Server: Apache/2.2.17 (Linux/SUSE) X-Powered-By: PHP/5.3.5 Content-Type: text/html What happens here is that it creates a "waiting list", so until this is finished processing, it will give us the answer. If we cut the connection before the end... What is a CLIENT-IP or X-Forwarded-For for Joomla! or SMF? a lot of SQL queries (load). If we send many more queries using keep-alive connections... besides the load remains on the server until the end, it creates more threads. This attack is not "slowloris" or "apachekiller". Ban? Try this: http://[domain]/[file]?{mn-fakeip} Not very smart... but it could work xD Or use fewer connections. Try against a Joomla! or SMF (Not a simple html). 2011/8/25 Ulises2k <[email protected]> > I have tried with Apache 2.2.9 and a simple file php and does not > cause DoS Apache Server. > > > > On Thu, Aug 25, 2011 at 19:21, Xianuro GL <[email protected]> wrote: > > > > linux-7nli:/home/xianur0/fhttp-v1.3/DoS # perl mn.pl http://[domain]/[file] > 30 100 190.1.1.1 > > > > Where "file" have to consume processing in the server (i.e. index.php for > Joomla! CMS). > > > > Remember the "http://"; :P > > > > 2011/8/25 -= Glowing Sex =- <[email protected]> > >> > >> Ummm ok, lets see, i tried to use this, it keeps giving me 'usage' abit > to much :P , even when i have read thru the code and seen an example/would > make example.... but seems it is not being nice, unless i have perhaps made > the error.. or it is not pasted in correctly,... i will try again but, i > sofar see no threat here, because it doesnt work to well, to start with... > btw, it looks alot like a slowloris like attack, wich would be blocked by > most servers... still, please show me some examples.. this is NOT a > happening script atm! > >> and also, maybe adjust encoding, so when copy and paste, it doesnt bork > up.. incase it is maybe that.... altho, it seems to exec fine... i am using > perl script.pl blah.com 10 10 ip.fake.here.ofc > >> nothing but usage... > >> cheers in advance > >> xd > >> > >> > >> > >> On 26 August 2011 06:42, Xianuro GL <[email protected]> wrote: > >>> > >>> Connection Keep-Alive + Pipelining + Close the connection before the > response + Something... = DoS > >>> Apache, IIS, Squid, NetCache, What else? > >>> > >>> _______________________________________________ > >>> Full-Disclosure - We believe in it. > >>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html > >>> Hosted and sponsored by Secunia - http://secunia.com/ > >> > > > > > > _______________________________________________ > > Full-Disclosure - We believe in it. > > Charter: http://lists.grok.org.uk/full-disclosure-charter.html > > Hosted and sponsored by Secunia - http://secunia.com/ >
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