In the module “Chronopost Official” (chronopost) up to version 6.4.0 from Chronopost for PrestaShop, a guest can perform SQL injection in affected versions if the module is not installed OR if a secret accessible to administrator is stolen.

Summary

  • CVE ID: CVE-2023-45377
  • Published at: 2023-11-21
  • Platform: PrestaShop
  • Product: chronopost
  • Impacted release: <= 6.2.1 (6.4.0 fixed the vulnerability)
  • Product author: Chronopost Official
  • Weakness: CWE-89
  • Severity: critical (9.8)

Description

Foreword : we are forced to tag privilege NONE on the CVSS 3.1 score which make it a critical vulnerability since it will be critical if the module has never been installed OR (if the CHRONOPOST_SECRET configuration do not exist OR is empty), but keep in mind that for the majority of installations, the gravity is reduced to CVSS 3.1 7.2/10

The script PHP cancelSkybill.php own a sensitive SQL calls that can be executed with a trivial http call and exploited to forge a SQL injection.

WARNING: Be informed that the partial access control affects other scripts on the module, you should apply “Other Recommendations”

For those who actively listen weak signals, this issue is not connected with this very old critical issue which will never have CVE (too old).

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 from 6.2.1

--- 6.2.1/modules/chronopost/async/cancelSkybill.php
+++ 6.4.0/modules/chronopost/async/cancelSkybill.php
...
-if (!Tools::getIsset('shared_secret') || Tools::getValue('shared_secret') != Configuration::get('CHRONOPOST_SECRET')) {
+if (Tools::isEmpty('shared_secret') || Tools::getValue('shared_secret') !== Configuration::get('CHRONOPOST_SECRET')) {
    die('Secret does not match.');
}
...
$LTRequest = DB::getInstance()->executeS(
    'SELECT lt, account_number FROM '
-    . _DB_PREFIX_ . 'chrono_lt_history WHERE id_order = ' . (int)Tools::getValue('id_order') . ' AND `cancelled` IS NULL AND lt = "' . Tools::getValue('skybill') . '"'
+    . _DB_PREFIX_ . 'chrono_lt_history WHERE id_order = ' . (int)Tools::getValue('id_order') . ' AND `cancelled` IS NULL AND lt = "' . pSQL(Tools::getValue('skybill')) . '"'
);

Other recommendations

  • Since this author always force its customers to use the same password on FTP links, you must if applicable, delete all FTP users which suffer of a predictable name such as “chronopost”
  • You should consider restricting the access of modules/chronopost/async/ to a whitelist
  • It’s recommended to upgrade to the latest version of the module chronopost.
  • 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

Date Action
2023-03-15 Issue discovered during a code review by TouchWeb.fr
2023-03-15 Contact PrestaShop Addons security Team to confirm version scope by author
2023-05-05 Recontact PrestaShop Addons security Team to confirm version scope by author
2023-10-06 Request a CVE ID
2023-10-11 Received CVE ID
2023-10-30 Recontact PrestaShop Addons security Team to confirm version scope by author
2023-10-30 PrestaShop Addons security Team confirms version scope and confirms the official patch
2023-11-21 Publish this security advisory