SE 4C03 Winter 2005
نویسنده
چکیده
A DOS attack consists of rendering a network unable to carry legitimate user data. This can be done via attacking routers directly or by flooding the network with excessive traffic. Router attacks restrict the router’s ability to forward as many packets or its ability to forward them properly. This can be achieved by abusing known vulnerabilities to modify routing tables (using protocols such as RIP-2 or OSPF) or bombarding the router with illegitimate or forged packets that exploit a flaw in the Transmission Control Protocol (TCP) and can cause excessive retransmissions towards a desired target. Resource consumption attacks can involve using excessive traffic or half-open connections to tie up the router’s buffers. The same such attacks can be carried out on whole networks as well by setting the packets to broadcast [1]. This report focuses on resource consumption attacks as they are more prevalent. DOS attacks can be carried out using commonly available PC hardware and an Internet Service Provider (ISP). An operating system providing raw sockets such as Unix/Linux (with root privileges) or Windows 2000/XP, and a C compiler are about all that is needed to orchestrate a DOS attack.
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