SSH Version Scanner - Metasploit


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

Table Of Contents
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Module Overview

Name: SSH Version Scanner
Module: auxiliary/scanner/ssh/ssh_version
Source code: modules/auxiliary/scanner/ssh/ssh_version.rb
Disclosure date: -
Last modification time: 2020-12-07 01:01:47 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 22
List of CVEs: -

Detect SSH Version.

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/ssh/ssh_version
msf auxiliary(ssh_version) > show options
    ... show and set options ...
msf auxiliary(ssh_version) > set RHOSTS ip-range
msf auxiliary(ssh_version) > exploit

Other examples of setting the RHOSTS option:

Example 1:

msf auxiliary(ssh_version) > set RHOSTS 192.168.1.3-192.168.1.200

Example 2:

msf auxiliary(ssh_version) > set RHOSTS 192.168.1.1/24

Example 3:

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

Required Options

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

Knowledge Base

Description

SSH, Secure SHell, is an encrypted network protocol used to remotely interact with an Operating System at a command line level. SSH is available on most every system, including Windows, but is mainly used by *nix administrators.

This module identifies the version of SSH service in use by the server based on the server's banner. Any SSH server should return this information.

Vulnerable Application

This module is tested on several different SSH services, such as:

  • Virtual testing environment: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8
  • github.com: SSH-2.0-babeld-38be96bc
  • gitlab.com: SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8

Verification Steps

  1. Do: use auxiliary/scanner/ssh/ssh_version
  2. Do: set rhosts [ips]
  3. Do: run

Scenarios

SSH-2.0 on GitHub

msf5 auxiliary(scanner/ssh/ssh_version) > use auxiliary/scanner/ssh/ssh_version
msf5 auxiliary(scanner/ssh/ssh_version) > set RHOSTS github.com
RHOSTS => github.com
msf5 auxiliary(scanner/ssh/ssh_version) > run

[+] 140.82.118.4:22       - SSH server version: SSH-2.0-babeld-38be96bc
[*] github.com:22         - Scanned 1 of 1 hosts (100% complete)
[*] Auxiliary module execution completed

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Msfconsole Usage

Here is how the scanner/ssh/ssh_version auxiliary module looks in the msfconsole:

msf6 > use auxiliary/scanner/ssh/ssh_version

msf6 auxiliary(scanner/ssh/ssh_version) > show info

       Name: SSH Version Scanner
     Module: auxiliary/scanner/ssh/ssh_version
    License: Metasploit Framework License (BSD)
       Rank: Normal

Provided by:
  Daniel van Eeden <[email protected]>

Check supported:
  No

Basic options:
  Name     Current Setting  Required  Description
  ----     ---------------  --------  -----------
  RHOSTS                    yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT    22               yes       The target port (TCP)
  THREADS  1                yes       The number of concurrent threads (max one per host)
  TIMEOUT  30               yes       Timeout for the SSH probe

Description:
  Detect SSH Version.

References:
  http://en.wikipedia.org/wiki/SecureShell

Module Options

This is a complete list of options available in the scanner/ssh/ssh_version auxiliary module:

msf6 auxiliary(scanner/ssh/ssh_version) > show options

Module options (auxiliary/scanner/ssh/ssh_version):

   Name     Current Setting  Required  Description
   ----     ---------------  --------  -----------
   RHOSTS                    yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT    22               yes       The target port (TCP)
   THREADS  1                yes       The number of concurrent threads (max one per host)
   TIMEOUT  30               yes       Timeout for the SSH probe

Advanced Options

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

msf6 auxiliary(scanner/ssh/ssh_version) > show advanced

Module advanced options (auxiliary/scanner/ssh/ssh_version):

   Name                 Current Setting  Required  Description
   ----                 ---------------  --------  -----------
   CHOST                                 no        The local client address
   CPORT                                 no        The local client port
   ConnectTimeout       10               yes       Maximum number of seconds to establish a TCP connection
   Proxies                               no        A proxy chain of format type:host:port[,type:host:port][...]
   SSL                  false            no        Negotiate SSL/TLS for outgoing connections
   SSLCipher                             no        String for SSL cipher - "DHE-RSA-AES256-SHA" or "ADH"
   SSLVerifyMode        PEER             no        SSL verification method (Accepted: CLIENT_ONCE, FAIL_IF_NO_PEER_CERT, NONE, PEER)
   SSLVersion           Auto             yes       Specify the version of SSL/TLS to be used (Auto, TLS and SSL23 are auto-negotiate) (Accepted: Auto, TLS, SSL23, SSL3, TLS1, TLS1.1, TLS1.2)
   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/ssh/ssh_version module can do:

msf6 auxiliary(scanner/ssh/ssh_version) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(scanner/ssh/ssh_version) > show evasion

Module evasion options:

   Name                Current Setting  Required  Description
   ----                ---------------  --------  -----------
   TCP::max_send_size  0                no        Maxiumum tcp segment size.  (0 = disable)
   TCP::send_delay     0                no        Delays inserted before every send.  (0 = disable)

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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.

No response

Here is a relevant code snippet related to the "No response" error message:

45:	      connect
46:	
47:	      resp = sock.get_once(-1, timeout)
48:	
49:	      if ! resp
50:	        vprint_warning("No response")
51:	        return Exploit::CheckCode::Unknown
52:	      end
53:	
54:	      ident, first_message = resp.split(/[\r\n]+/)
55:	      info = ""

Was not SSH -- <RESP.SIZE> bytes beginning with <VALUE>

Here is a relevant code snippet related to the "Was not SSH -- <RESP.SIZE> bytes beginning with <VALUE>" error message:

53:	
54:	      ident, first_message = resp.split(/[\r\n]+/)
55:	      info = ""
56:	
57:	      if /^SSH-\d+\.\d+-(.*)$/ !~ ident
58:	        vprint_warning("Was not SSH -- #{resp.size} bytes beginning with #{resp[0, 12]}")
59:	        return Exploit::CheckCode::Safe(details: { ident: ident })
60:	      end
61:	
62:	      banner = $1
63:

Timed out after <TIMEOUT> seconds. Skipping.

Here is a relevant code snippet related to the "Timed out after <TIMEOUT> seconds. Skipping." error message:

89:	    end
90:	  rescue EOFError, Rex::ConnectionError => e
91:	    vprint_error(e.message) # This may be a little noisy, but it is consistent
92:	    Exploit::CheckCode::Unknown
93:	  rescue Timeout::Error
94:	    vprint_warning("Timed out after #{timeout} seconds. Skipping.")
95:	    Exploit::CheckCode::Unknown
96:	  ensure
97:	    disconnect
98:	  end
99:	end

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References

See Also

Check also the following modules related to this module:

Authors

  • Daniel van Eeden <metasploit[at]myname.nl>

Version

This page has been produced using Metasploit Framework version 6.1.27-dev. For more modules, visit the Metasploit Module Library.

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