1 쉽게 접근하자 DoS! Sookmyung Women’s Univ. 최서윤. 2 The DoS?! Sockstress DoS using LOIC Link Local DoS.

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Presentation transcript:

1 쉽게 접근하자 DoS! Sookmyung Women’s Univ. 최서윤

2 The DoS?! Sockstress DoS using LOIC Link Local DoS

3

4 Attacked Scientology Websites Attacked the RIAA Hacked the HB Gary Company

5 Attacked the websites Originally performed DoS attack Using twitter th3j35t3r

6 Denial of Service attack Distributed Denial of Service attack - Destruction system - Bandwidth consumption - Exhausts Server Resources

7

8 Client SYN/ACK SYN ACK Server DATA ACK

9 Client SYN/ACK SYN ACK win =0 Server

10

11 Causes sessions to hang up, consuming RAM Can render servers unbootable

12 Defense - Short-term  Block packets with small window sizes with a firewall - Long-term  Patch OS to reclaim RAM

13

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20 NEED AN IP USE THIS IP

21 I AM Router! Join! OKAY

22

23 flood_ router6 Using BackTrack5 Also effects FreeBSD Windows dies within 30 seconds No effect on Mac OS X & Ubuntu Linux

24 Windows Vulnerability One attacker kills all the Windows machines on a LAN Win 8 & Server 2012 dies (BSoD)

25 Effects of New RA Flood Microsoft Surface RT dies Win 7 & Server 2008  Freeze during attack Win 8 & Server 2012 dies (BSoD) iPad 3 & Android phone slows and crashes (sometimes) Mac OS X dies

26 Defense Disable IPv6 Turn off Router Discovery Get a switch with RA Guard Microsoft provides some protection

27 Keep-Alive DoS Script Router Advertisement DoS in Windows RA Guard Evasion Jester pic LOIC

28 News Generation about DoS attack and-links-to-jester-anonymous-and-lulzsec.html Layer 4 DoS layer-4-and-low-rate-ddos/ Layer 7 DoS About LOIC

29 Layer 7 DoS About Sockstress and New RA flood DEFCON-21-Bowne-Prince-Evil-DoS-Attacks-and-Strong-Defenses Youtube Sam Bowne video

30 Thank you ★

31 ★