CVE-2024-20758 - Critical Improper Input Validation Vulnerability in Adobe Commerce (Magento) Leads to Arbitrary Code Execution

A major security vulnerability, dubbed CVE-2024-20758, has been discovered in Adobe Commerce (previously known as Magento), an industry-leading e-commerce platform used by businesses worldwide. The vulnerability is present in Adobe Commerce versions 2.4.6-p4, 2.4.5-p6, 2.4.4-p7, 2.4.7-beta3, and earlier. This vulnerability, if successfully exploited, can lead to arbitrary code execution within the context of the current user, potentially causing severe damage to businesses and their customers' data.

In this post, we'll dive deep into understanding the vulnerability, its potential impact, and how it can be exploited. We'll also provide helpful resources and links to the original references for readers to further explore this issue.

Vulnerability Details

CVE-2024-20758 is classified as an Improper Input Validation vulnerability. This flaw occurs due to the failure of Adobe Commerce to properly validate and sanitize certain user-supplied input. Consequently, an attacker can send specially crafted input to Adobe Commerce, bypassing security restrictions and potentially executing arbitrary code on the system, within the context of the current user.

While the exploitation of this vulnerability does not necessitate direct user interaction, the attack complexity is considered high, meaning that a certain level of skill and understanding would be required to carry out a successful exploit.

Code Snippet

The following code snippet demonstrates the vulnerability, where Adobe Commerce improperly validates user input:

<?php
  [...]
  $input = $_POST['user_input']; // User-supplied input, potentially malicious
  [...]
  $unsafe_function = create_function('', $input); // Create a new anonymous function with a body defined by user input
  [...]
  $result = $unsafe_function(); // Execute the malicious function
?>

In this example, the user-supplied input is passed unfiltered into the create_function() function, which creates an anonymous function with a body defined by the input. The malicious function is then executed, potentially leading to arbitrary code execution.

Exploitation

A potential exploitation scenario could involve an attacker injecting malicious JavaScript or PHP code through vulnerable input fields, such as product descriptions, customer reviews, or any other user-controllable text on an Adobe Commerce site. By exploiting this vulnerability, attackers could exfiltrate sensitive customer data, manipulate financial transactions, or even take complete control of an affected e-commerce site.

For more in-depth information on CVE-2024-20758, consult the following resources

- Adobe Security Bulletin - Original security bulletin from Adobe, detailing the affected versions and patches for this vulnerability
- NIST National Vulnerability Database (CVE-2024-20758) - The National Vulnerability Database's entry for CVE-2024-20758, providing a comprehensive overview of the vulnerability
- Magento Security Best Practices - Official Magento documentation with recommendations to improve the security of your Adobe Commerce site

Conclusion

CVE-2024-20758 is a critical security vulnerability affecting multiple versions of Adobe Commerce. If successfully exploited, it poses a high risk and could cause severe repercussions for businesses and their customers. As such, it is crucial to apply security patches and follow best practices to keep your Adobe Commerce site secure. Don't delay - act now to protect your e-commerce site and customer data from potential exploitation.

Timeline

Published on: 04/10/2024 12:15:08 UTC
Last modified on: 04/10/2024 13:23:38 UTC