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CVE-2024-21627: Cross-Site Scripting Vulnerability in PrestaShop’s `isCleanHTML` Method

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Overview

The open-source e-commerce platform, PrestaShop, suffers from a significant cross-site scripting (XSS) vulnerability, identified as CVE-2024-21627. This vulnerability is particularly concerning as it affects all PrestaShop versions prior to 8.1.3 and 1.7.8.11. The severity of this vulnerability lies in its potential to lead to data leakage or even a full system compromise if successfully exploited by an attacker. Users and administrators of the PrestaShop platform should be aware of this vulnerability and take necessary steps to mitigate its risks.

Vulnerability Summary

CVE ID: CVE-2024-21627
Severity: High (CVSS: 8.1)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Data Leakage and Potential System Compromise

Affected Products

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Product | Affected Versions

PrestaShop | < 8.1.3 PrestaShop | < 1.7.8.11 How the Exploit Works

The vulnerability arises from PrestaShop’s `isCleanHTML` method not detecting certain event attributes, which can potentially lead to a Cross-Site Scripting (XSS) attack. An attacker could exploit this by injecting malicious scripts into the web application, which would then be executed when a user interacts with the affected web page. This could result in a successful attacker gaining unauthorized access to sensitive information or even taking control of the system.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited:

POST /prestashop/addProduct HTTP/1.1
Host: target.example.com
Content-Type: text/html
{ "productName": "<script>malicious_script_here</script>" }

In this example, the attacker injects a script within the `productName` attribute. When this product name is displayed on the web page, the browser executes the malicious script, leading to the XSS attack.

Mitigation Guidance

The most effective way to mitigate this vulnerability is by applying the vendor patch. Those using PrestaShop versions 8.1.3 and 1.7.8.11 are already protected as these versions contain a patch for this issue.
If updating is not immediately possible, users can use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation. Additionally, the `HTMLPurifier` library, which is a dependency in the PrestaShop project, can be used to sanitize HTML input coming from users. However, be aware that in legacy object models, fields of `HTML` type will call `isCleanHTML`.
As always, it is recommended to follow good security practices, such as input validation and sanitization, to further protect against such vulnerabilities.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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