CVE-2023-46358: [CVE-2023-46358] Improper neutralization of SQL parameter in Snegurka - Referral and Affiliation Program module for PrestaShop

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In the module “Referral and Affiliation Program” (referralbyphone) up to 3.5.1 (all versions - see WARNING) from Snegurka for PrestaShop, a guest can perform SQL injection in affected versions.

Summary

• CVE ID: CVE-2023-46358
• Published at: 2023-10-24
• Platform: PrestaShop
• Product: referralbyphone
• Impacted release: <= 3.5.1 (WARNING : The author has not fixed the vulnerability)
• Product author: Snegurka
• Weakness: CWE-89
• Severity: critical (9.8)

Description

Method ReferralByPhoneDefaultModuleFrontController::ajaxProcessCartRuleValidate 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.

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.

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’s ajax scripts
• Rewrite SMTP settings to hijack emails

Proof of concept

curl -v -d 'fc=modulemodule=referralbyphone&controller=default&action=CartRuleValidate&ws_voucher=%27;select+0x73656C65637420736C656570283432293B+into+@a;prepare+b+from+@a;execute+b;--' 'https://preprod.X'

Patch from 3.5.1

--- 3.5.1/modules/referralbyphone/controllers/front/default.php
+++ XXXXX/modules/referralbyphone/controllers/front/default.php
        $id_ws_sponsor = Db::getInstance(_PS_USE_SQL_SLAVE_)->getValue(
-           'SELECT `id_ws_sponsor` FROM `' . _DB_PREFIX_ . 'ws_ref_coupon_rule` WHERE `code` = \'' . $ws_voucher . '\''
+           'SELECT `id_ws_sponsor` FROM `' . _DB_PREFIX_ . 'ws_ref_coupon_rule` WHERE `code` = \'' . pSQL($ws_voucher) . '\''
        );

Other recommendations

• It’s recommended to delete the module since author no longer maintain it.
• 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 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

2023-07-20

Issue discovered during a code review by TouchWeb.fr

2023-07-20

Contact PrestaShop Addons security Team to confirm versions scope by author

2023-07-20

PrestaShop Addons security Team confirm versions scope

2023-08-22

Contact the author again for a fix

2023-10-19

Contact the author again for a fix

2023-10-19

PrestaShop Addons security Team confirms that the author has not yet produced a patch

2023-10-20

Request a CVE ID

2023-10-23

Received CVE ID

2023-10-24

Publish this security advisory

Links

• PrestaShop addons product page
• National Vulnerability Database

DISCLAIMER: The French Association Friends Of Presta (FOP) acts as an intermediary to help hosting this advisory. While we strive to ensure the information and advice provided are accurate, FOP cannot be held liable for any consequences arising from reported vulnerabilities or any subsequent actions taken.