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What is a Teardrop Attack?



Article ID: KB4824 KB Last Updated: 07 Jun 2010Version: 3.0
What is a Teardrop Attack?


Note: This article applies to ScreenOS 4.0 and higher.

Teardrop attacks exploit the reassembly of fragmented IP packets. In the IP header, one of the fields is the fragment offset field. It indicates the starting position, or 'offset', of the data contained in a fragmented packet relative to the data of the original unfragmented packet. When the sum of the offset and size of one fragmented packet differ from that of the next fragmented packet, the packets overlap, and the server attempting to reassemble the packet can crash, especially if it is running an older operating system that has this vulnerability.

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