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What happens when I get a SYN and FIN Bits Set Attack?

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Article ID: KB4745 KB Last Updated: 09 Jun 2010Version: 3.0
Summary:
What happens when I get a SYN and FIN Bits Set Attack?
Symptoms:

Solution:

Note: This article applies to ScreenOS 4.0 and higher.

Both the SYN and FIN control flags are not normally set in the same TCP segment header. The SYN flag synchronizes sequence numbers to initiate a TCP connection. The FIN flag indicates the end of data transmission to finish a TCP connection. Their purposes are mutually exclusive. A TCP header with the SYN and FIN flags set is anomalous TCP behavior, causing various responses from the recipient, depending on the OS.



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