CVE-2024-0789 in WP Maintenance Plugin
Summary
by MITRE • 06/19/2024
The WP Maintenance plugin for WordPress is vulnerable to IP Address Spoofing in all versions up to, and including, 6.1.9.2 due to insufficient IP address validation and use of user-supplied HTTP headers as a primary method for IP retrieval. This makes it possible for unauthenticated attackers to bypass maintenance mode.
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Analysis
by VulDB Data Team • 06/20/2024
The WP Maintenance plugin for WordPress presents a critical security vulnerability classified as CVE-2024-0789, affecting all versions through 6.1.9.2. This vulnerability stems from inadequate IP address validation mechanisms within the plugin's codebase, creating a significant bypass opportunity for malicious actors seeking to circumvent maintenance mode restrictions. The flaw specifically manifests in how the plugin processes and validates IP addresses, relying heavily on user-supplied HTTP headers as the primary method for determining client IP addresses, which creates an inherent security risk.
The technical implementation of this vulnerability allows attackers to manipulate HTTP headers such as X-Forwarded-For, X-Real-IP, or Client-IP to present falsified IP addresses to the plugin's validation system. This weakness directly maps to CWE-284 Access Control Bypass, where insufficient input validation permits unauthorized access to protected resources. The plugin's design fails to properly sanitize or validate the IP address information retrieved from HTTP headers, enabling attackers to spoof their IP addresses and gain access to maintenance mode protected content.
Operationally, this vulnerability creates a severe impact on WordPress site security and availability. Unauthenticated attackers can bypass maintenance mode restrictions without requiring any credentials or authentication, potentially gaining access to administrative interfaces, sensitive data, or internal systems that should remain protected during maintenance periods. The attack surface expands significantly as attackers can exploit this weakness to perform unauthorized actions such as accessing restricted pages, modifying content, or potentially escalating privileges within the affected WordPress environment. This vulnerability particularly affects sites that rely on maintenance mode for security reasons or during system updates, as it undermines the fundamental purpose of these protective measures.
The implications of this vulnerability extend beyond simple access bypass, as it represents a broader pattern of insecure input handling within web applications. According to ATT&CK framework technique T1213, adversaries may exploit such weaknesses to gain unauthorized access to systems through manipulation of network traffic or header injection attacks. Organizations using the WP Maintenance plugin in their WordPress environments face significant risk of unauthorized access during maintenance windows, potentially leading to data breaches, system compromise, or service disruption. The vulnerability demonstrates the critical importance of proper input validation and the dangers of trusting user-supplied data without adequate sanitization or verification processes.
Mitigation strategies should focus on immediate plugin updates to the latest secure versions, which should include proper IP address validation and sanitization mechanisms. Administrators should implement additional network-level security controls such as firewall rules that restrict access to maintenance mode pages, implement proper authentication mechanisms for maintenance access, and consider network segmentation to limit exposure. The recommended approach includes validating IP addresses against known good sources, implementing strict header validation, and avoiding reliance on potentially manipulable HTTP headers for critical access control decisions. Organizations should also conduct thorough security assessments of their WordPress installations to identify similar vulnerabilities in other plugins or themes that may be susceptible to similar IP spoofing attacks.