CVE-2014-9283 in Captcha
Summary
by MITRE
The BestWebSoft Captcha plugin before 4.0.7 for WordPress allows remote attackers to bypass the CAPTCHA protection mechanism and obtain administrative access via unspecified vectors.
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Analysis
by VulDB Data Team • 04/14/2018
The CVE-2014-9283 vulnerability represents a critical security flaw in the BestWebSoft Captcha plugin for WordPress systems, affecting versions prior to 4.0.7. This vulnerability fundamentally undermines the core security mechanism designed to prevent automated attacks by allowing remote threat actors to bypass CAPTCHA protection entirely. The vulnerability exists within the plugin's authentication and authorization framework, creating a pathway for malicious users to escalate privileges without proper verification. The unspecified vectors suggest that the flaw could be exploited through multiple attack surfaces within the plugin's codebase, potentially including input validation weaknesses, session management issues, or improper access control implementations.
The technical nature of this vulnerability aligns with common web application security patterns that fall under CWE-305 Authentication Bypass and CWE-287 Improper Certificate Validation, where the system fails to properly verify user credentials or authorization status. The CAPTCHA mechanism, which is specifically designed to distinguish between human users and automated bots, becomes ineffective due to this flaw, allowing attackers to submit malicious requests without demonstrating human interaction. This bypass capability directly impacts the plugin's intended security posture, which relies on CAPTCHA validation as a primary defense against brute force attacks, spam submissions, and unauthorized administrative access attempts.
From an operational perspective, the impact of CVE-2014-9283 extends beyond simple privilege escalation to potentially compromise entire WordPress installations. Attackers who successfully exploit this vulnerability can gain administrative access to affected systems, enabling them to modify content, install malicious plugins, steal sensitive data, or establish persistent backdoors. The vulnerability's remote exploitability means that attackers do not require physical access or local system credentials to leverage the flaw, making it particularly dangerous in shared hosting environments or multi-tenant systems. This type of vulnerability directly maps to ATT&CK technique T1078 Valid Accounts, where adversaries use compromised credentials to maintain access to systems, and T1190 Exploit Public-Facing Application, which describes attacks targeting web applications exposed to the internet.
Organizations affected by this vulnerability should prioritize immediate remediation through plugin updates to version 4.0.7 or later, which contains the necessary security patches to address the bypass mechanism. Additionally, system administrators should conduct comprehensive security audits of their WordPress installations, reviewing user permissions and implementing additional security controls such as two-factor authentication, web application firewalls, and regular security monitoring. The vulnerability demonstrates the critical importance of keeping third-party plugins updated, as outdated components often contain unpatched security flaws that can be easily exploited by threat actors. Security teams should also consider implementing automated vulnerability scanning tools that can detect and alert on outdated or vulnerable plugins, ensuring that such security gaps are identified and addressed proactively rather than reactively.