CVE-2017-12650 in Loginizer Plugin
Summary
by MITRE
SQL Injection exists in the Loginizer plugin before 1.3.6 for WordPress via the X-Forwarded-For HTTP header.
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Analysis
by VulDB Data Team • 11/04/2019
The vulnerability identified as CVE-2017-12650 represents a critical SQL injection flaw within the Loginizer WordPress plugin, affecting versions prior to 1.3.6. This security weakness specifically exploits the handling of the X-Forwarded-For HTTP header during authentication processes, creating a pathway for malicious actors to execute unauthorized database operations. The vulnerability resides in the plugin's improper sanitization of user-supplied input that flows through this particular HTTP header, which is commonly used in web applications to identify the original IP address of a client connecting through a proxy or load balancer. The flaw allows attackers to inject malicious SQL commands into the database query execution flow, potentially compromising the entire WordPress installation and underlying database infrastructure. This vulnerability directly maps to CWE-89, which categorizes SQL injection as a fundamental weakness in software design where untrusted data is incorporated into SQL queries without proper validation or escaping mechanisms.
The technical exploitation of this vulnerability occurs when an attacker manipulates the X-Forwarded-For HTTP header to inject malicious SQL payloads during login attempts or other authenticated operations. The Loginizer plugin, designed to enhance WordPress security through features like login attempt monitoring and IP blocking, inadvertently creates a backdoor through its insufficient input validation. When the plugin processes this header without adequate sanitization, it allows attackers to construct SQL queries that bypass authentication mechanisms, potentially gaining administrative access to the WordPress site. The attack vector is particularly concerning because the X-Forwarded-For header is routinely used in legitimate web traffic, making the exploitation less obvious and more difficult to detect through standard network monitoring. This vulnerability aligns with ATT&CK technique T1190, which describes the use of vulnerabilities in software to gain unauthorized access to systems, specifically targeting the authentication and credential access phases of the attack lifecycle.
The operational impact of this vulnerability extends beyond simple data theft, as successful exploitation can lead to complete compromise of the WordPress installation and potentially the entire hosting environment. Attackers could manipulate user accounts, inject malicious content, modify database structures, or even establish persistent backdoors within the WordPress framework. The vulnerability affects not only the immediate WordPress site but also poses risks to other applications sharing the same database infrastructure, as database-level attacks can propagate across interconnected systems. Organizations running vulnerable versions of Loginizer face significant exposure to credential stuffing attacks, where attackers leverage stolen credentials from other breaches to exploit this weakness, and to more sophisticated attacks involving data exfiltration and system infiltration. The vulnerability's persistence in the authentication flow means that even legitimate users could be affected by unauthorized access attempts, creating both immediate security risks and potential long-term damage to organizational reputation and compliance status.
Mitigation strategies for CVE-2017-12650 require immediate action to upgrade the Loginizer plugin to version 1.3.6 or later, which includes proper input sanitization for the X-Forwarded-For header. System administrators should implement network-level protections such as web application firewalls that can detect and block suspicious HTTP header patterns, particularly those containing SQL injection payloads. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other plugins and themes that may be susceptible to similar input handling flaws. Organizations should also establish robust monitoring protocols to detect unusual patterns in authentication attempts and IP address tracking, as the X-Forwarded-For header manipulation often occurs in conjunction with other attack vectors. Additionally, implementing proper access controls and multi-factor authentication mechanisms can provide defense-in-depth layers that reduce the overall impact of such vulnerabilities. The remediation process should include comprehensive testing to ensure that the updated plugin functions correctly while maintaining all intended security features, and security teams should monitor for any related vulnerabilities in the WordPress ecosystem that may present similar attack surfaces through different input vectors.