CVE-2021-4409 in WooCommerce Etsy Integration Plugin
Summary
by MITRE • 07/12/2023
The WooCommerce Etsy Integration plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.3.1. This is due to missing or incorrect nonce validation on the etcpf_delete_feed() function. This makes it possible for unauthenticated attackers to delete an export feed via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
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Analysis
by VulDB Data Team • 07/12/2023
The WooCommerce Etsy Integration plugin represents a critical security vulnerability classified as CVE-2021-4409, affecting versions up to and including 3.3.1. This plugin facilitates the integration between WordPress-based e-commerce websites and Etsy marketplaces, enabling merchants to export their product catalogs for synchronization with Etsy accounts. The vulnerability stems from inadequate security controls within the plugin's codebase, specifically targeting the etcpf_delete_feed() function which handles the deletion of export feeds. The absence of proper nonce validation creates a significant attack surface that malicious actors can exploit to manipulate the plugin's functionality without authentication.
The technical flaw manifests as a failure to implement proper cryptographic token validation mechanisms within the plugin's administrative functions. Nonces, or numbers used once, serve as critical security tokens that verify legitimate requests and prevent unauthorized operations. In this case, the etcpf_delete_feed() function lacks the necessary nonce verification checks that would normally ensure only authenticated administrators can perform feed deletion operations. This omission allows attackers to craft malicious requests that appear legitimate to the WordPress system, bypassing standard authentication requirements. The vulnerability operates under CWE-352, which specifically addresses Cross-Site Request Forgery issues in web applications, making it a direct implementation of this well-known security weakness.
The operational impact of this vulnerability extends beyond simple data manipulation, potentially compromising the integrity of e-commerce operations and merchant data. An attacker who successfully exploits this vulnerability can delete export feeds without authentication, which may result in loss of product synchronization data, disruption of sales processes, and potential revenue impact. The attack requires social engineering elements to trick administrators into clicking malicious links, aligning with ATT&CK technique T1566 for credential harvesting through social engineering. Site administrators who unknowingly click on malicious links could inadvertently delete critical export feeds, causing disruption to their Etsy integration workflows and potentially affecting their online sales operations. The vulnerability's unauthenticated nature means that attackers do not need valid credentials to exploit the issue, making it particularly dangerous.
Mitigation strategies for this vulnerability should prioritize immediate plugin updates to versions that address the nonce validation issue. Administrators should ensure their WooCommerce Etsy Integration plugin is updated to the latest stable release that includes proper nonce validation mechanisms. Additionally, implementing network-level security controls such as web application firewalls can provide additional protection layers against CSRF attacks. Security monitoring should be enhanced to detect unusual administrative activities or unauthorized feed deletion operations. Organizations should also conduct regular security assessments of their WordPress plugins and ensure all third-party components are kept current with security patches. The vulnerability demonstrates the critical importance of proper input validation and authentication mechanisms in web applications, particularly those handling commerce data. Regular security audits and adherence to security best practices including the principle of least privilege can significantly reduce the risk of exploitation. This vulnerability serves as a reminder that even seemingly minor security oversights in plugin code can create substantial risks for e-commerce operations and highlights the necessity of comprehensive security testing for all web application components.