CVE-2024-3047 is a Server-Side Request Forgery (SSRF) vulnerability classified under CWE-918, found in the PDF Invoices & Packing Slips for WooCommerce plugin for WordPress. This vulnerability exists in versions up to and including 3.8.0, specifically within the transform() function. SSRF vulnerabilities enable attackers to abuse a vulnerable server to send crafted requests to arbitrary locations, including internal network services that are otherwise inaccessible externally. In this case, the vulnerability allows unauthenticated attackers to induce the web application to perform HTTP requests to arbitrary URLs. This can be leveraged to query internal services, potentially exposing sensitive information or modifying internal data if those services accept such requests. The vulnerability has a CVSS 3.1 base score of 7.2, indicating high severity, with an attack vector of network (remote), low attack complexity, no privileges required, and no user interaction needed. The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component, and the impact includes low confidentiality and integrity loss but no availability impact. No public exploit code is currently known, but the risk remains significant due to the ease of exploitation and the unauthenticated nature of the attack. The plugin is widely used in WooCommerce-based e-commerce sites, which are prevalent globally, increasing the potential attack surface.

The SSRF vulnerability can have serious consequences for organizations running WooCommerce sites with the affected plugin. Attackers can leverage this flaw to perform reconnaissance on internal network resources, potentially discovering sensitive internal services such as databases, metadata services in cloud environments, or internal APIs. This can lead to unauthorized disclosure of confidential information or unauthorized modification of internal data if the internal services are vulnerable. Although the vulnerability does not directly affect availability, the confidentiality and integrity impacts can facilitate further attacks, including lateral movement within the network or data exfiltration. E-commerce sites are particularly sensitive due to the potential exposure of customer data and transactional information. The unauthenticated nature of the vulnerability increases the risk of automated scanning and exploitation attempts. Organizations without proper network segmentation or internal service protections are at higher risk.

To mitigate this vulnerability, organizations should immediately update the PDF Invoices & Packing Slips for WooCommerce plugin to a version that addresses the SSRF issue once available. Until a patch is released, administrators should consider disabling or restricting the plugin’s functionality that invokes the transform() function if feasible. Implement network-level controls to restrict outbound HTTP requests from the web server to only trusted destinations, thereby limiting the ability of SSRF to reach internal services. Employ Web Application Firewalls (WAFs) with rules designed to detect and block SSRF attack patterns targeting this plugin. Review and harden internal services to require authentication and validate incoming requests to prevent unauthorized access or modification. Monitor logs for unusual outbound requests originating from the web application. Additionally, conduct internal network segmentation to isolate critical services from the web server environment. Regularly audit plugin usage and maintain an inventory of WordPress plugins to ensure timely updates and vulnerability management.