In the module “XML Feeds PRO” (xmlfeeds) up to versions 3.8.2 from Bl Modules for PrestaShop, a guest can perform SQL injection in affected versions.

Summary

  • CVE ID: CVE-2023-39643
  • Published at: 2023-08-29
  • Platform: PrestaShop
  • Product: xmlfeeds
  • Impacted release: <= 3.8.2 (3.9.8 fixed the vulnerability)
  • Product author: Bl Modules
  • Weakness: CWE-89
  • Severity: critical (9.8)

Description

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

WARNING : This exploit is actively used to deploy a webskimmer to massively steal credit cards.

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

Proof of concept

curl -v 'https://preprod.X/modules/xmlfeeds/search.php?s=1&s_p=1);select(0x73656C65637420736C656570283432293B)INTO@a;prepare`b`from@a;execute`b`;--'

Patch from 3.8.2

--- 3.8.2/modules/xmlfeeds/xmlfeeds.php
+++ 3.9.8/modules/xmlfeeds/xmlfeeds.php
$moduleImgPath = '../modules/xmlfeeds/views/img/';

        if (!empty($selected_products) && $selected_products != 'undefined') {
-           $where_selected = ' AND l.id_product NOT IN ('.$selected_products.')';
+           $where_selected = ' AND l.id_product NOT IN ('.implode(',', array_map('intval', explode(',', $selected_products))).')';
        }

Other recommendations

  • It’s recommended to upgrade to the latest version of the module xmlfeeds.
  • To help improve the security of your PrestaShop installation, we recommend upgrading to the latest version. One of the benefits of upgrading is that it will disable the use of multiquery executions (separated by semicolons). However, please be aware that this will not protect your shop against SQL injection attacks that use the UNION clause to steal data. Additionally, it’s important to note that PrestaShop includes a function called pSQL, which includes a strip_tags function. This helps protect your shop against Stored XSS (also known as XSS T2) of Category 1. If a pSQL function is missing, it could potentially expose your project to critical Stored XSS vulnerabilities due to edge cases. Therefore, it’s crucial to ensure that all relevant functions are properly implemented and used consistently throughout your project.
  • Change the default database prefix ps_ with a new longer, arbitrary prefix. Nevertheless, be warned that this is useless against blackhats with DBA senior skills 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

Date Action
2023-04-06 Issue discovered during a code review by TouchWeb.fr
2023-04-06 Contact PrestaShop Addons security Team to confirm versions scope by author
2023-04-19 Request a CVE ID
2023-05-15 PrestaShop Addons security Team confirm versions scope
2023-08-25 Received CVE ID
2023-08-29 Publish this security advisory