WordPress auth_captcha Plugin: API CAPTCHA Bypass Vulnerability (CWE-287) Analysis & Fix

Vulnerability Summary: Web API Form Submission Bypassing auth_captcha Verification Vulnerability Overview This vulnerability allows attackers to bypass the CAPTCHA verification mechanism enforced by the plugin by submitting forms via the Web API. Since the plugin does not validate API requests, attackers can exploit this flaw to perform automated operations such as bulk registration, spam comments, or brute-force attacks. Scope of Impact Plugin Name: Affected Versions: - All versions (including 3.6.0 and 3.6.1) - Specific versions: 3.6.0, 3.6.1 Affected Platform: WordPress websites Affected Functions: - User registration forms - Comment forms - Login forms - Other form submission scenarios utilizing the plugin Vulnerability Type: CAPTCHA Bypass CVSS Score: 5.3 (Medium Risk) CWE ID: CWE-287 (Improper Authorization) Remediation 1. Update the Plugin: - Upgrade the plugin to the latest version (recommended to update to version 3.6.2 or higher). - If the plugin is no longer maintained, consider replacing it with another CAPTCHA plugin that supports API validation. 2. Manual Fix: - Add validation logic for API requests in the plugin code to ensure all form submissions (including API requests) undergo CAPTCHA verification. - Example fix code (adjust according to the actual plugin structure): 3. Temporary Mitigation: - Disable the plugin until the fix is implemented. - Use other security plugins (e.g., Wordfence, iThemes Security) to provide additional protection. POC Code / Exploit Code Additional Information Vulnerability Discoverer: Not disclosed Report Date: 2023-09-15 Fix Date: 2023-09-20 Related Resources: - WordPress Official Plugin Repository - CVE Database Notes This vulnerability only affects websites using the plugin. Attackers must know the target website's API endpoint to exploit this vulnerability. It is recommended to regularly check for plugin updates and promptly fix known vulnerabilities.

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WordPress auth_captcha Plugin: API CAPTCHA Bypass Vulnerability (CWE-287) Analysis & Fix

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