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Description When a SYN ood attack is initiated, attackers will send a SYN packet from system A to system B However, the attackers will spoof the source address of a nonexistent system System B will then try to send a SYN/ACK packet to the spoofed address If the spoofed system exists, it would normally respond with an RST packet to system B because it did not initiate the connection The attackers must choose a system that is unreachable Therefore, system B will send a SYN/ACK packet and never receive an RST packet back from system A This potential connection is now in the SYN_RECV state and placed into a connection queue This system is now committed to setting up a connection, and this potential connection will only be ushed from the queue after the connection-establishment timer expires The connection timer varies from system to system but could be as short as 75 seconds or as long as 23 minutes for some broken IP implementations Because the connection queue is normally very small, attackers may only have to send a few SYN packets every 10 seconds to completely disable a speci c port The system under attack will never be able to clear the backlog queue before receiving new SYN requests Due to the unreliable nature of UDP, it is relatively trivial to send overwhelming streams of UDP packets that can cause noticeable computational load to a system There is nothing technically extraordinary about UDP ooding beyond the ability to send as many UDP packets as possible in the shortest amount of time Distributed re ected denial of service (DRDoS) consists of sending spoofed or forged requests to a large number of computers This is typically performed by compromised systems belonging to a botnet The source address is set to that of the victim, thus all replies will ood the victim system The Smurf Attack is one of the earliest forms of DRDoS Recently DNS ampli cation attacks increase the potency of this attack as small requests are made to DNS servers that respond with large packets, overwhelming the victim system An attacker nds a resource on a popular Internet site that requires very little computation for the client to request and yet causes a very high computational load on the server to deliver A good example of this is initiating multiple simultaneous searches across a bulletin board site (for example, vBulletin, phpBB) Using perhaps as little as a few queries per second, the attacker can now bring the site to its knees
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Application layer
Hacking Exposed 6: Network Security Secrets & Solutions
COUNTERMEASURES
Because of their intractable nature, DoS and DDoS attacks must be confronted with multipronged defenses involving resistance, detection, and response None of the approaches will ever be 100 percent effective, but by using them in combination you can achieve proper risk mitigation for your online presence The following table outlines several countermeasure techniques that can help mitigate the nasty effects of a DoS attack Countermeasure Block ICMP and UDP Description DoS attacks have traditionally attempted to leverage these protocols to achieve maximum abuse Because neither is commonly used much anymore (at least for broad public access), we recommend heavily restricting these at the network edge (disable them outright if possible) Block invalid inbound traf c, such as private and reserved address ranges that should normally never be honored as valid source addresses For a good list of such addresses, see http:// wwwcymrucom/Bogons Egress ltering essentially stops spoofed IP packets from leaving your network The best way to do this is to permit your sites valid source addresses to the Internet and then deny all other source addresses To prevent your site being used as an amplifying site you should disable directed broadcast functionality at your border router For Cisco routers, you use the following command: no ip directed-broadcast This will disable directed broadcasts As of Cisco IOS version 12, this functionality is enabled by default For other devices, consult the user documentation to disable directed broadcasts We also recommend reading Stop Your Network from Being Used as a Broadcast Ampli cation Site, RFC 2644, a Best Current Practice RFC by Daniel Senie, which updates RFC 1812 to state that router software must default to denying the forwarding and receipt of directed broadcasts When Unicast RPF is enabled on an interface, the router examines all packets received as input on that interface to make sure that the source address and source interface appear in the routing table and match the interface on which the packet was received This helps to cleanse traf c of packets with potentially modi ed or forged source addresses See http://wwwcisco com/univercd/cc/td/doc/product/software/ios111/cc111/ uni_rpfhtm
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