TCP ACK Firewall Scanner - Metasploit


This page contains detailed information about how to use the auxiliary/scanner/portscan/ack metasploit module. For list of all metasploit modules, visit the Metasploit Module Library.

Table Of Contents
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Module Overview

Name: TCP ACK Firewall Scanner
Module: auxiliary/scanner/portscan/ack
Source code: modules/auxiliary/scanner/portscan/ack.rb
Disclosure date: -
Last modification time: 2017-07-24 06:26:21 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): -
List of CVEs: -

Map out firewall rulesets with a raw ACK scan. Any unfiltered ports found means a stateful firewall is not in place for them.

Module Ranking and Traits

Module Ranking:

  • normal: The exploit is otherwise reliable, but depends on a specific version and can't (or doesn't) reliably autodetect. More information about ranking can be found here.

Basic Usage

This module is a scanner module, and is capable of testing against multiple hosts.

msf > use auxiliary/scanner/portscan/ack
msf auxiliary(ack) > show options
    ... show and set options ...
msf auxiliary(ack) > set RHOSTS ip-range
msf auxiliary(ack) > exploit

Other examples of setting the RHOSTS option:

Example 1:

msf auxiliary(ack) > set RHOSTS 192.168.1.3-192.168.1.200

Example 2:

msf auxiliary(ack) > set RHOSTS 192.168.1.1/24

Example 3:

msf auxiliary(ack) > set RHOSTS file:/tmp/ip_list.txt

Required Options

  • RHOSTS: The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'

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Msfconsole Usage

Here is how the scanner/portscan/ack auxiliary module looks in the msfconsole:

msf6 > use auxiliary/scanner/portscan/ack

msf6 auxiliary(scanner/portscan/ack) > show info

       Name: TCP ACK Firewall Scanner
     Module: auxiliary/scanner/portscan/ack
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  kris katterjohn <[email protected]>

Check supported:
  No

Basic options:
  Name       Current Setting  Required  Description
  ----       ---------------  --------  -----------
  BATCHSIZE  256              yes       The number of hosts to scan per set
  DELAY      0                yes       The delay between connections, per thread, in milliseconds
  INTERFACE                   no        The name of the interface
  JITTER     0                yes       The delay jitter factor (maximum value by which to +/- DELAY) in milliseconds.
  PORTS      1-10000          yes       Ports to scan (e.g. 22-25,80,110-900)
  RHOSTS                      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  SNAPLEN    65535            yes       The number of bytes to capture
  THREADS    1                yes       The number of concurrent threads (max one per host)
  TIMEOUT    500              yes       The reply read timeout in milliseconds

Description:
  Map out firewall rulesets with a raw ACK scan. Any unfiltered ports 
  found means a stateful firewall is not in place for them.

Module Options

This is a complete list of options available in the scanner/portscan/ack auxiliary module:

msf6 auxiliary(scanner/portscan/ack) > show options

Module options (auxiliary/scanner/portscan/ack):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   BATCHSIZE  256              yes       The number of hosts to scan per set
   DELAY      0                yes       The delay between connections, per thread, in milliseconds
   INTERFACE                   no        The name of the interface
   JITTER     0                yes       The delay jitter factor (maximum value by which to +/- DELAY) in milliseconds.
   PORTS      1-10000          yes       Ports to scan (e.g. 22-25,80,110-900)
   RHOSTS                      yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   SNAPLEN    65535            yes       The number of bytes to capture
   THREADS    1                yes       The number of concurrent threads (max one per host)
   TIMEOUT    500              yes       The reply read timeout in milliseconds

Advanced Options

Here is a complete list of advanced options supported by the scanner/portscan/ack auxiliary module:

msf6 auxiliary(scanner/portscan/ack) > show advanced

Module advanced options (auxiliary/scanner/portscan/ack):

   Name                 Current Setting  Required  Description
   ----                 ---------------  --------  -----------
   GATEWAY_PROBE_HOST   8.8.8.8          yes       Send a TTL=1 random UDP datagram to this host to discover the default gateway's MAC
   GATEWAY_PROBE_PORT                    no        The port on GATEWAY_PROBE_HOST to send a random UDP probe to (random if 0 or unset)
   SECRET               1297303073       yes       A 32-bit cookie for probe requests.
   ShowProgress         true             yes       Display progress messages during a scan
   ShowProgressPercent  10               yes       The interval in percent that progress should be shown
   VERBOSE              false            no        Enable detailed status messages
   WORKSPACE                             no        Specify the workspace for this module

Auxiliary Actions

This is a list of all auxiliary actions that the scanner/portscan/ack module can do:

msf6 auxiliary(scanner/portscan/ack) > show actions

Auxiliary actions:

   Name  Description
   ----  -----------

Evasion Options

Here is the full list of possible evasion options supported by the scanner/portscan/ack auxiliary module in order to evade defenses (e.g. Antivirus, EDR, Firewall, NIDS etc.):

msf6 auxiliary(scanner/portscan/ack) > show evasion

Module evasion options:

   Name  Current Setting  Required  Description
   ----  ---------------  --------  -----------

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Error Messages

This module may fail with the following error messages:

Error Messages

Check for the possible causes from the code snippets below found in the module source code. This can often times help in identifying the root cause of the problem.

PORTS

Here is a relevant code snippet related to the "PORTS" error message:

43:	
44:	  def run_batch(hosts)
45:	
46:	    ports = Rex::Socket.portspec_crack(datastore['PORTS'])
47:	    if ports.empty?
48:	      raise Msf::OptionValidateError.new(['PORTS'])
49:	    end
50:	
51:	    jitter_value = datastore['JITTER'].to_i
52:	    if jitter_value < 0
53:	      raise Msf::OptionValidateError.new(['JITTER'])

JITTER

Here is a relevant code snippet related to the "JITTER" error message:

48:	      raise Msf::OptionValidateError.new(['PORTS'])
49:	    end
50:	
51:	    jitter_value = datastore['JITTER'].to_i
52:	    if jitter_value < 0
53:	      raise Msf::OptionValidateError.new(['JITTER'])
54:	    end
55:	
56:	    delay_value = datastore['DELAY'].to_i
57:	    if delay_value < 0
58:	      raise Msf::OptionValidateError.new(['DELAY'])

DELAY

Here is a relevant code snippet related to the "DELAY" error message:

53:	      raise Msf::OptionValidateError.new(['JITTER'])
54:	    end
55:	
56:	    delay_value = datastore['DELAY'].to_i
57:	    if delay_value < 0
58:	      raise Msf::OptionValidateError.new(['DELAY'])
59:	    end
60:	
61:	    open_pcap
62:	
63:	    pcap = self.capture

Error

Here is a relevant code snippet related to the "Error" error message:

98:	            :type	=> "TCP UNFILTERED #{dhost}:#{dport}",
99:	            :data	=> "TCP UNFILTERED #{dhost}:#{dport}"
100:	          )
101:	
102:	        rescue ::Exception
103:	          print_error("Error: #{$!.class} #{$!}")
104:	        end
105:	      end
106:	    end
107:	
108:	    close_pcap

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See Also

Check also the following modules related to this module:

Authors

kris katterjohn

Version

This page has been produced using Metasploit Framework version 6.1.24-dev. For more modules, visit the Metasploit Module Library.

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