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Description

This module will attempt to initiate a TCP/IP connection with ports on the victim machine. It is this done by sending a SYN packet, and if victim replies with a SYN/ACK packet that means the port is open. Then the attacker sends a RST packet, and as a result the victim's machine assumes that there is a communication error. The attacker now knows the state of port without a full tcp connection. Major benefit of TCP SYN scan is that most logging applications do not log the TCP/RST by default.

Options

PORTS

This is the list of TCP ports to test on each host. Formats like 1-3, 1,2,3, 1,2-3, etc. are all supported. Default options is to scan 1-10000 ports.

TIMEOUT

Maximum time to wait for a response. The default value is 500 milliseconds.

VERBOSE

Gives detailed message about the scan of all the ports. It also shows the ports that were closed.

Verification Steps

1. Do: use auxiliary/scanner/portscan/syn

2. Do: set RHOSTS [IP]

3. Do: set PORTS [PORTS]

4. Do: run

5. If any of the TCP ports were open they will be discovered, status will be printed indicating as such.

Scenarios

Metaspliotable 2

msf > use auxiliary/scanner/portscan/syn
msf auxiliary(syn) > set RHOSTS 192.168.45.159
RHOSTS => 192.168.45.159
msf auxiliary(syn) > set PORTS 1-10000
PORTS => 1-10000
msf auxiliary(syn) > run
[*]  TCP OPEN 192.168.45.159:22
[*]  TCP OPEN 192.168.45.159:23
[*]  TCP OPEN 192.168.45.159:111
[*]  TCP OPEN 192.168.45.159:445
[*]  TCP OPEN 192.168.45.159:512
[*]  TCP OPEN 192.168.45.159:513
[*]  TCP OPEN 192.168.45.159:1099
[*]  TCP OPEN 192.168.45.159:2121
[*]  TCP OPEN 192.168.45.159:3306
[*]  TCP OPEN 192.168.45.159:3632
[*]  TCP OPEN 192.168.45.159:6000
[*]  TCP OPEN 192.168.45.159:6697
[*]  TCP OPEN 192.168.45.159:8009
[*] Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed