Sysax Multi-Server 6.10 SSHD Key Exchange Denial of Service - Metasploit


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

Table Of Contents
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Module Overview

Name: Sysax Multi-Server 6.10 SSHD Key Exchange Denial of Service
Module: auxiliary/dos/windows/ssh/sysax_sshd_kexchange
Source code: modules/auxiliary/dos/windows/ssh/sysax_sshd_kexchange.rb
Disclosure date: 2013-03-17
Last modification time: 2020-10-02 17:38:06 +0000
Supported architecture(s): -
Supported platform(s): -
Target service / protocol: -
Target network port(s): 22
List of CVEs: -

This module sends a specially-crafted SSH Key Exchange causing the service to crash.

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

msf > use auxiliary/dos/windows/ssh/sysax_sshd_kexchange
msf auxiliary(sysax_sshd_kexchange) > show targets
    ... a list of targets ...
msf auxiliary(sysax_sshd_kexchange) > set TARGET target-id
msf auxiliary(sysax_sshd_kexchange) > show options
    ... show and set options ...
msf auxiliary(sysax_sshd_kexchange) > exploit

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 dos/windows/ssh/sysax_sshd_kexchange auxiliary module looks in the msfconsole:

msf6 > use auxiliary/dos/windows/ssh/sysax_sshd_kexchange

msf6 auxiliary(dos/windows/ssh/sysax_sshd_kexchange) > show info

       Name: Sysax Multi-Server 6.10 SSHD Key Exchange Denial of Service
     Module: auxiliary/dos/windows/ssh/sysax_sshd_kexchange
    License: Metasploit Framework License (BSD)
       Rank: Normal
  Disclosed: 2013-03-17

Provided by:
  Matt "hostess" Andreko <[email protected]>

Check supported:
  No

Basic options:
  Name           Current Setting  Required  Description
  ----           ---------------  --------  -----------
  CLIENTVERSION  Debian-5ubuntu1  yes       The SSH client version to report.
  RHOSTS                          yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
  RPORT          22               yes       The target port (TCP)

Description:
  This module sends a specially-crafted SSH Key Exchange causing the 
  service to crash.

References:
  OSVDB (92081)
  http://www.mattandreko.com/2013/04/sysax-multi-server-610-ssh-dos.html

Module Options

This is a complete list of options available in the dos/windows/ssh/sysax_sshd_kexchange auxiliary module:

msf6 auxiliary(dos/windows/ssh/sysax_sshd_kexchange) > show options

Module options (auxiliary/dos/windows/ssh/sysax_sshd_kexchange):

   Name           Current Setting  Required  Description
   ----           ---------------  --------  -----------
   CLIENTVERSION  Debian-5ubuntu1  yes       The SSH client version to report.
   RHOSTS                          yes       The target host(s), range CIDR identifier, or hosts file with syntax 'file:<path>'
   RPORT          22               yes       The target port (TCP)

Advanced Options

Here is a complete list of advanced options supported by the dos/windows/ssh/sysax_sshd_kexchange auxiliary module:

msf6 auxiliary(dos/windows/ssh/sysax_sshd_kexchange) > show advanced

Module advanced options (auxiliary/dos/windows/ssh/sysax_sshd_kexchange):

   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)
   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 dos/windows/ssh/sysax_sshd_kexchange module can do:

msf6 auxiliary(dos/windows/ssh/sysax_sshd_kexchange) > show actions

Auxiliary actions:

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

Evasion Options

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

msf6 auxiliary(dos/windows/ssh/sysax_sshd_kexchange) > 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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References

See Also

Check also the following modules related to this module:

Authors

Matt "hostess" Andreko <mandreko[at]accuvant.com>

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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