CVE-2022-4047 in Return Refund and Exchange for WooCommerce Plugin
Summary
by MITRE • 12/26/2022
The Return Refund and Exchange For WooCommerce WordPress plugin before 4.0.9 does not validate attachment files to be uploaded via an AJAX action available to unauthenticated users, which could allow them to upload arbitrary files such as PHP and lead to RCE
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Analysis
by VulDB Data Team • 04/14/2025
The vulnerability identified as CVE-2022-4047 affects the Return Refund and Exchange For WooCommerce WordPress plugin version 4.0.8 and earlier, presenting a critical security risk that stems from inadequate input validation within the plugin's file upload functionality. This flaw exists within an AJAX action endpoint that is accessible to unauthenticated users, creating an attack surface that bypasses standard WordPress authentication mechanisms. The vulnerability specifically targets the plugin's handling of file attachments submitted through the return and refund process, where users can upload supporting documentation for their requests.
The technical implementation of this vulnerability resides in the plugin's failure to properly validate file types and content when processing AJAX uploads. An attacker can exploit this by crafting malicious file uploads that bypass the intended validation checks, potentially uploading PHP scripts or other executable files to the web server. This misconfiguration creates a path for remote code execution as the uploaded files can be executed within the context of the web server's privileges. The vulnerability directly maps to CWE-434, which describes insecure file upload vulnerabilities where applications accept files without proper validation of type, size, or content.
The operational impact of this vulnerability is severe as it allows attackers to gain unauthorized access to the affected WordPress installation and potentially compromise the entire web server. Once an attacker successfully uploads malicious files, they can execute arbitrary code remotely, potentially leading to data theft, service disruption, or further lateral movement within the network. The attack vector is particularly dangerous because it does not require authentication, meaning any user can exploit this vulnerability without needing valid credentials. This aligns with ATT&CK technique T1505.003 for Server Software Component and T1190 for Exploit Public-Facing Application, which describes how attackers can leverage unauthenticated web application vulnerabilities to gain system access.
Mitigation strategies should include immediate patching of the plugin to version 4.0.9 or later, which addresses the file validation issues. Organizations should also implement additional security measures such as restricting file upload capabilities, implementing proper file type validation, and monitoring upload directories for suspicious activity. Network-level protections including web application firewalls and intrusion detection systems can help detect and block malicious upload attempts. Security best practices recommend configuring the WordPress environment with proper file permissions, disabling unnecessary upload features, and maintaining regular security audits of installed plugins to identify similar vulnerabilities that may exist in other components of the web application stack.