CVE-2022-37411 in Captcha Code Plugin
Summary
by MITRE • 09/09/2022
Cross-Site Request Forgery (CSRF) vulnerability in Vinoj Cardoza's Captcha Code plugin <= 2.7 at WordPress.
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Analysis
by VulDB Data Team • 10/15/2022
The CVE-2022-37411 vulnerability represents a critical cross-site request forgery flaw within the Captcha Code plugin for WordPress, specifically affecting versions up to and including 2.7. This vulnerability resides in the plugin developed by Vinoj Cardoza and poses significant security risks to WordPress websites that utilize this captcha solution. The issue stems from the plugin's inadequate implementation of anti-CSRF measures, allowing malicious actors to exploit the authentication mechanism through crafted requests that appear to originate from legitimate users.
The technical flaw manifests in the plugin's failure to properly validate and verify the authenticity of requests submitted through its captcha functionality. When users interact with the plugin's forms or administrative interfaces, the system does not adequately enforce token-based validation or referer checking mechanisms that would normally prevent unauthorized requests from being processed. This weakness enables attackers to construct malicious requests that can manipulate the plugin's behavior without proper authorization, potentially leading to unauthorized actions within the WordPress environment.
The operational impact of this vulnerability extends beyond simple data manipulation, as it can enable attackers to perform administrative actions within the WordPress site. An attacker could leverage this CSRF vulnerability to modify plugin settings, bypass captcha verification for spam submissions, or potentially gain unauthorized access to restricted areas of the site. The vulnerability particularly affects sites where the plugin is used for comment validation, contact forms, or other user interaction mechanisms that rely on captcha verification to prevent automated attacks.
Security professionals should recognize this vulnerability as a classic example of insufficient anti-CSRF protection mechanisms, aligning with CWE-352, which specifically addresses cross-site request forgery issues. The flaw demonstrates how web applications must implement robust validation techniques including unique request tokens, proper referer header checking, or SameSite cookie attributes to prevent unauthorized operations. Organizations using this plugin should immediately update to the latest version where the CSRF protections have been properly implemented and validated.
Mitigation strategies should include immediate patching of the vulnerable plugin to version 2.8 or later, which addresses the CSRF implementation gaps. Additionally, administrators should review their WordPress security configurations and consider implementing additional protective measures such as web application firewalls, request validation layers, and monitoring for suspicious activities. The vulnerability also highlights the importance of regularly updating third-party plugins and maintaining comprehensive security assessments of all website components, particularly those handling user authentication or administrative functions. Organizations should also consider implementing proper input validation and output encoding practices as recommended by the OWASP Top Ten and MITRE ATT&CK framework, which emphasize the need for robust protection against CSRF attacks through proper token management and request verification mechanisms.