Headline

CVE-2023-30150: [CVE-2023-30150] Improper neutralization of SQL parameters in the Leo Custom Ajax (leocustomajax) module from LeoTheme for PrestaShop

PrestaShop leocustomajax 1.0 and 1.0.0 are vulnerable to SQL Injection via modules/leocustomajax/leoajax.php.

1 year ago

Multiple SQL injection vulnerabilities in the Leo Custom Ajax (leocustomajax) module from LeoTheme for PrestaShop, in version 1.0, allow remote attackers to execute arbitrary SQL commands via the cat_list, pro_info, pro_add, pro_cdown or pro_color parameter in leoajax.php.

Summary

CVE ID: CVE-2023-30150
Published at: none
Advisory source: Friends-Of-Presta
Platform: PrestaShop
Product: leocustomajax
Impacted release: = 1.0 (May also be identified as 1.0.0)
Product author: LeoTheme
Weakness: CWE-89
Severity: critical (9.8)

Description

In the Leo Custom Ajax (leocustomajax) module for PrestaShop, in version 1.0 and 1.0.0 (no other versions have been published since), an HTTP request can be manipulated using multiple GET parameters (cat_list, pro_info, pro_add, pro_cdown and pro_color), in the /modules/leocustomajax/leoajax.php endpoint, enabling a remote attacker to perform an SQL injection.

WARNING : This vulnerability can be exploited even if the module is disabled or uninstalled, and is actively used to deploy 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 exposed tokens and unlock admins’s ajax scripts
Rewrite SMTP settings for hijacked emails

Proof of concept

https://example.test/modules/leocustomajax/leoajax.php?cat_list=10%29;select+0x73656C65637420736C656570283432293B+into+@a;prepare+b+from+@a;execute+b;--

Patch

Disabling or uninstalling the module is not enough. The module needs to be fully removed from the file system or patched.

--- a/modules/leocustomajax/leoajax.php
+++ b/modules/leocustomajax/leoajax.php
@@ -25,6 +25,7 @@ $leoProductInfo = new Leocustomajax();
 if ($listCat) {
     $listCat = explode(',', $listCat);
     $listCat = array_unique($listCat);
+    $listCat = array_map('intval', $listCat);
     $listCat = implode(',', $listCat);
 
     $sql = 'SELECT COUNT(cp.`id_product`) AS total, cp.`id_category`
@@ -44,6 +45,7 @@ if ($listCat) {
 if ($leoProCdown) {
     $leoProCdown = explode(',', $leoProCdown);
     $leoProCdown = array_unique($leoProCdown);
+    $leoProCdown = array_map('intval', $leoProCdown);
     $leoProCdown = implode(',', $leoProCdown);
     $result['pro_cdown'] = $leoProductInfo->hookProductCdown($leoProCdown);
 }
@@ -51,6 +53,7 @@ if ($leoProCdown) {
 if ($leoProColor) {
     $leoProColor = explode(',', $leoProColor);
     $leoProColor = array_unique($leoProColor);
+    $leoProColor = array_map('intval', $leoProColor);
     $leoProColor = implode(',', $leoProColor);
     $result['pro_color'] = $leoProductInfo->hookProductColor($leoProColor);
 }
@@ -59,6 +62,7 @@ if ($leoProColor) {
 if ($leoProInfo) {
     $leoProInfo = explode(',', $leoProInfo);
     $leoProInfo = array_unique($leoProInfo);
+    $leoProInfo = array_map('intval', $leoProInfo);
     $leoProInfo = implode(',', $leoProInfo);
 
     # $leocustomajax = new Leocustomajax();
@@ -67,6 +71,7 @@ if ($leoProInfo) {
 if ($leoProAdd) {
     $leoProAdd = explode(',', $leoProAdd);
     $leoProAdd = array_unique($leoProAdd);
+    $leoProAdd = array_map('intval', $leoProAdd);
     $leoProAdd = implode(',', $leoProAdd);
 
     $result['pro_add'] = $leoProductInfo->hookProductOneImg($leoProAdd);

Other recommendations

Upgrade PrestaShop to the latest version to disable multiquery executions (separated by “;”)
Change the default database prefix ps_ by 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 these set of rules.

Timeline

Date

Action

2022-09-18

Discovery of the vulnerability by Profileo

2022-09-19

Security issue reported to the author

2022-09-20

Issue confirmed by the author

2023-03-25

Request for additional details concerning impacted versions

2023-03-28