[CVE-2023-40922] Improper neutralization of SQL parameter in KerAwen module for PrestaShop

PrestaShop Security Advisory

In the module “KerAwen” (kerawen) up to version 2.3.81.1 from KerAwen for PrestaShop, an anonymous user can perform a SQL injection.

Summary

  • CVE ID: CVE-2023-40922
  • Published at: 2023-11-02
  • Platform: PrestaShop
  • Product: kerawen
  • Impacted release: < 2.5.1 (2.5.1 fixed the vulnerability)
  • Product author: Kerawen
  • Weakness: CWE-89
  • Severity: critical (9.8)

Description

The method KerawenDeliveryModuleFrontController::initContent() has a sensitive SQL call that can be executed with a trivial http call and exploited to forge a SQL injection.

This exploit uses a PrestaShop front controller and most attackers can conceal the module controller’s path during the exploit, so you will never know within your conventional frontend logs that it exploits this vulnerability. You will only see “POST /” inside your conventional frontend logs. Activating the AuditEngine of mod_security (or similar) is the only way to get data to confirm this exploit.

WARNING : The exploit will bypass most WAF due to its design. Patch it quickly.

CVSS base metrics

  • Attack vector: network
  • Attack complexity: low
  • Privilege required: none
  • User interaction: none
  • Scope: unchanged
  • Confidentiality: high
  • Integrity: high
  • Availability: high

Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Possible malicious usage

  • Obtain admin access
  • Steal/Remove data from the associated PrestaShop
  • Copy/paste data from sensitive tables to FRONT to expose tokens and unlock admins’s ajax scripts
  • Rewrite SMTP settings to hijack emails

Patch

--- a/modules/kerawen/controllers/front/delivery.php
+++ b/modules/kerawen/controllers/front/delivery.php
                                case 'updateDeliveryDate':
                                        if ($id_cart && Tools::isSubmit('delivery_date'))
                                        {
                                                $date = date(Tools::getValue('delivery_date'));
                                                Db::getInstance()->execute(
                                                        'INSERT INTO `'._DB_PREFIX_.'cart_kerawen` (id_cart, delivery_date)
-                                                        VALUES ('. (int) $id_cart .', FROM_UNIXTIME('.$date.'))
+                                                        VALUES ('. (int) $id_cart .', FROM_UNIXTIME("'.pSQL($date).'"))
                                                        ON DUPLICATE KEY UPDATE delivery_date = VALUES(delivery_date)');
                                        }
                                        break;

Other recommendations

  • It’s recommended to upgrade to the latest version of the module Kerawen.
  • Upgrade PrestaShop to the latest version to disable multiquery executions (separated by “;”) – be warned that this functionality WILL NOT protect your SHOP against injection SQL which uses the UNION clause to steal data.
  • Change the default database prefix ps_ with a new longer, arbitrary prefix. Nevertheless, be warned that this is useless against blackhats with DBA senior skill because of a design vulnerability in DBMS
  • Activate OWASP 942’s rules on your WAF (Web application firewall), be warned that you will probably break your backoffice and you will need to pre-configure some bypasses against this set of rules.

Timeline

DateAction
2022-12-13Issue discovered after security audit by TouchWeb.fr and documented by 202-ecommerce.com
2022-12-13Contact author
2022-12-20Recontact author
2022-12-20The author confirm the vulnerability
2023-01-04Author provide a patch
2023-08-15Request a CVE ID
2023-08-25Received CVE ID
2023-11-02Publish this security advisory

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