CAPEC-326 TCP Initial Window Size Probe

This OS fingerprinting probe checks the initial TCP Window size. TCP stacks limit the range of sequence numbers allowable within a session to maintain the "connected" state within TCP protocol logic. The initial window size specifies a range of acceptable sequence numbers that will qualify as a response to an ACK packet within a session. Various operating systems use different Initial window sizes. The initial window size can be sampled by establishing an ordinary TCP connection.

• The ability to monitor and interact with network communications.Access to at least one host, and the privileges to interface with the network interface card.

• Confidentiality: Read Data • Confidentiality, Access Control, Authorization: Bypass Protection Mechanism, Hide Activities