CAPEC-301

TCP Connect Scan
Low
Stable
2014-06-23
00h00 +00:00
2022-02-22
00h00 +00:00
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Descriptions CAPEC

An adversary uses full TCP connection attempts to determine if a port is open on the target system. The scanning process involves completing a 'three-way handshake' with a remote port, and reports the port as closed if the full handshake cannot be established. An advantage of TCP connect scanning is that it works against any TCP/IP stack.

Informations CAPEC

Execution Flow

1) Experiment

An adversary attempts to initialize a TCP connection with with the target port.

2) Experiment

An adversary uses the result of their TCP connection to determine the state of the target port. A successful connection indicates a port is open with a service listening on it while a failed connection indicates the port is not open.

Prerequisites

The adversary requires logical access to the target network. The TCP connect Scan requires the ability to connect to an available port and complete a 'three-way-handshake' This scanning technique does not require any special privileges in order to perform. This type of scan works against all TCP/IP stack implementations.

Resources Required

The adversary can leverage a network mapper or scanner, or perform this attack via routine socket programming in a scripting language. Packet injection tools are also useful for this purpose. Depending upon the method used it may be necessary to sniff the network to see the response.

Mitigations

Employ a robust network defense posture that includes an IDS/IPS system.

Related Weaknesses

CWE-ID Weakness Name

CWE-200

 Exposure of Sensitive Information to an Unauthorized Actor
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

References

REF-33

Hacking Exposed: Network Security Secrets & Solutions
Stuart McClure, Joel Scambray, George Kurtz.

REF-128

RFC793 - Transmission Control Protocol
Defense Advanced Research Projects Agency Information Processing Techniques Office, Information Sciences Institute University of Southern California.
http://www.faqs.org/rfcs/rfc793.html

REF-34

Nmap Network Scanning: The Official Nmap Project Guide to Network Discovery and Security Scanning
Gordon "Fyodor" Lyon.

REF-130

The Art of Port Scanning
Gordon "Fyodor" Lyon.
http://phrack.org/issues/51/11.html

Submission

Name Organization Date Date release
CAPEC Content Team The MITRE Corporation 2014-06-23 +00:00

Modifications

Name Organization Date Comment
CAPEC Content Team The MITRE Corporation 2018-07-31 +00:00 Updated Attack_Prerequisites, Description, Description Summary, References, Related_Weaknesses, Resources_Required, Solutions_and_Mitigations
CAPEC Content Team The MITRE Corporation 2020-12-17 +00:00 Updated Execution_Flow
CAPEC Content Team The MITRE Corporation 2022-02-22 +00:00 Updated Description, Extended_Description