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Slowloris HTTP Dos
Gichan_Lee_Alex
Slowloris
 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(Wiki)
 Slowloris tries to keep many
connections to the target
web server open and hold
them open as long as
possible.
Features
 This is based on HTTP get Flooding
 Attacking PC is only one face-to-face
 It has a very normal session
 It does not leave the log until the attack ends.
 Target is located in the architecture itself of the
server, therefore its difficult to defense originally.
Are you dead yet?
RUDY(R-U-Dead-Yet?)
 RUDY is translated into 
讌 譯曙 ? in Korean. it
means that dying slowly.
Slowloris is a subset of RUDY that is
kind of DDoS.
 RUDY is different from general DDoS
attack. The biggest difference is a
attacking way.
 Slowloris has a method that gradually
increasing the session established,
and then gradually undermine those
target server resources instead of
sending a large traffic the server cant
endure.
when	 sessions	 the	 server	 had	 become	 full,	 	 
the	 server	 will	 die
Principle
OPENED
OPENED
OPENED
OPENED
OPENED
OPENED
OPENED
Denial
of
Service
other
clients
Client Server
SYN
SYN-ACK
Connection established
Incomplete ACK
The ACK signal to server have to be ended with 0d0a0d0a
BUT
Slowloris sends only first 0d0a-. therefore the server will wait
the remainder -0d0a with established connection
Environment
Target Server : 172.17.22.178
Slowloris.pl
DEMO

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Security problems - Ddos Slowloris HTTP Dos

  • 2. Slowloris 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(Wiki) Slowloris tries to keep many connections to the target web server open and hold them open as long as possible.
  • 3. Features This is based on HTTP get Flooding Attacking PC is only one face-to-face It has a very normal session It does not leave the log until the attack ends. Target is located in the architecture itself of the server, therefore its difficult to defense originally.
  • 5. RUDY(R-U-Dead-Yet?) RUDY is translated into 讌 譯曙 ? in Korean. it means that dying slowly. Slowloris is a subset of RUDY that is kind of DDoS. RUDY is different from general DDoS attack. The biggest difference is a attacking way. Slowloris has a method that gradually increasing the session established, and then gradually undermine those target server resources instead of sending a large traffic the server cant endure. when sessions the server had become full, the server will die
  • 7. Client Server SYN SYN-ACK Connection established Incomplete ACK The ACK signal to server have to be ended with 0d0a0d0a BUT Slowloris sends only first 0d0a-. therefore the server will wait the remainder -0d0a with established connection
  • 8. Environment Target Server : 172.17.22.178 Slowloris.pl