Professional Penetration Testing by Wilhelm Thomas

Author:Wilhelm, Thomas [Wilhelm, Thomas]
Language: eng
Format: epub
Publisher: Elsevier Science
Published: 2013-07-01T14:00:00+00:00

TCP Scanning

Most of the interesting applications from a pentest perspective use TCP to communicate across the networks, including Web servers, file transfer applications, databases, and more. There are a few different tools we can use to determine port status, but for this section we will use two tools: Nmap and netcat. Understanding the fields within the TCP header, seen in Figure 7.6, will assist us to identify what is occurring when we do launch some of the more advanced scans. Of particular interest in the header is the control bits starting at the 106th bit, labeled URG, ACK, PSH, RST, SYN, and FIN. These control bits are used to provide connection reliability between two systems.

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