A penetration tester is assessing a proprietary network service that uses a non-standard TCP handshake. To test for potential vulnerabilities, the tester needs to craft and send packets with specific, custom-defined TCP flags and payload data. Which of the following tools would be most effective for scripting these custom packets?
The correct choice is Scapy. Scapy is a powerful Python-based packet manipulation program and library that allows a user to forge, send, capture, and decode network packets. It is the ideal tool for this scenario because it provides the granular control needed to programmatically build packets with custom flags and payloads to test non-standard protocols. Netcat is primarily used for reading and writing data across network connections, and while versatile, it lacks Scapy's advanced packet crafting capabilities. Tcpdump and Wireshark are primarily packet capture and analysis tools and cannot be used to craft and send packets in this manner.
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What is Scapy and how is it used in network testing?
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How does Scapy differ from packet capture tools like tcpdump?
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Can Scapy work on networks secured with encryption (e.g., HTTPS)?