CVE-2024-12562 - s2Member Pro Plugin for WordPress is Vulnerable to PHP Object Injection Through Unauthenticated Attacks

s2Member Pro, a popular membership plugin for WordPress sites, is vulnerable to PHP Object Injection in all versions up to, and including, 241216. This vulnerability originates from deserialization of untrusted input from the 's2member_pro_remote_op' vulnerable parameter. Unauthenticated attackers can exploit this vulnerability and potentially cause targeted sites significant damage.

Exploit Details

The exploit consists of injecting a malicious PHP Object using the 's2member_pro_remote_op' parameter. However, there is no known property-oriented programming (POP) chain currently present in the vulnerable software. In some cases, an additional plugin or theme installed on the target system might contain the necessary POP chain, which might allow the attacker to delete arbitrary files, retrieve sensitive data, or execute arbitrary code.

Below is a code snippet example illustrating the vulnerable deserialization within the s2Member Pro plugin:

function handle_remote_op() {
  if (!empty($_REQUEST['s2member_pro_remote_op'])) {
    // Process the base64-encoded input
    $input = base64_decode($_REQUEST['s2member_pro_remote_op']);
    
    // Deserialize the input into a PHP object
    $object = unserialize($input);
    
    // Process the deserialized object
    process_object($object);
  }
}

Original References and Sources

- CVE-2024-12562 - National Vulnerability Database (NVD)
- s2Member Pro - Official Website
- WordPress Plugin Repository - s2Member Pro

How to Protect Your Site

At this time, there is no known fix for the s2Member Pro plugin. We highly recommend the following steps to minimize the potential risks:

Regularly review and check your WordPress site for any unexpected changes or unauthorized access.

3. Limit access to your WordPress admin area and ensure that all user accounts have been secured with strong, unique passwords.
4. Regularly update all other plugins and themes installed on your WordPress site to protect against potential exploits.

Stay vigilant, and ensure that your site is protected to the best of your ability by keeping all software up-to-date and using strong security measures.

Timeline

Published on: 02/15/2025 10:15:08 UTC