CVE-2012-4263 in Better-wp-security
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in inc/admin/content.php in the Better WP Security (better_wp_security) plugin before 3.2.5 for WordPress allows remote attackers to inject arbitrary web script or HTML via the HTTP_USER_AGENT header.
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Analysis
by VulDB Data Team • 12/07/2021
The CVE-2012-4263 vulnerability represents a critical cross-site scripting flaw within the Better WP Security plugin for WordPress, specifically affecting versions prior to 3.2.5. This vulnerability resides in the inc/admin/content.php file and demonstrates a classic input validation weakness that enables remote attackers to execute malicious scripts within the context of affected users' browsers. The vulnerability exploits the plugin's improper handling of the HTTP_USER_AGENT header, which is a standard HTTP request header containing information about the client software making the request. This particular implementation flaw allows attackers to inject arbitrary web scripts or HTML code directly through this header field, bypassing normal input sanitization mechanisms that should protect against such attacks.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious HTTP_USER_AGENT header containing script code and submits it to a WordPress site running the vulnerable Better WP Security plugin. When the plugin processes this header in the content.php file, it fails to properly sanitize or escape the input before rendering it in the administrative interface. This creates a persistent XSS vector where the malicious code executes in the browser context of any administrator or user who views the affected administrative pages. The vulnerability is particularly dangerous because it leverages a header field that is automatically included with every HTTP request, making it difficult to detect and prevent through traditional user input validation methods. This type of vulnerability falls under CWE-79 which specifically addresses Cross-Site Scripting flaws, and aligns with ATT&CK technique T1059.005 for command and scripting interpreter.
The operational impact of CVE-2012-4263 extends beyond simple script injection, as it provides attackers with the capability to hijack administrative sessions, steal sensitive information, modify plugin configurations, or redirect users to malicious websites. Administrative users who view the affected plugin interface become victims of the XSS attack, potentially allowing attackers to gain elevated privileges or extract session cookies. The vulnerability particularly affects WordPress administrators who rely on the Better WP Security plugin for their site's protection, creating a paradoxical situation where security tools become attack vectors. The attack surface is broad as the vulnerability affects all versions before 3.2.5, and since WordPress sites often have numerous administrators with varying levels of access, the potential for damage is significant. Security researchers have noted that this vulnerability demonstrates poor input handling practices that violate fundamental security principles outlined in the OWASP Top Ten and the ISO/IEC 27001 security standards, which emphasize the importance of input validation and output encoding.
Mitigation strategies for CVE-2012-4263 focus primarily on immediate remediation through plugin updates to version 3.2.5 or later, where the vulnerability has been addressed through proper input sanitization of the HTTP_USER_AGENT header. Organizations should implement comprehensive patch management procedures to ensure timely updates of all WordPress plugins and themes, particularly security-focused ones that handle sensitive administrative data. Additional protective measures include implementing Content Security Policy headers to limit script execution, monitoring web server logs for suspicious USER_AGENT patterns, and conducting regular security audits of plugin installations. Network-level protections such as web application firewalls can help detect and block malicious USER_AGENT headers, while user education about the risks of visiting untrusted sites and the importance of keeping software updated remains essential. The vulnerability also underscores the importance of the principle of least privilege, where administrative access should be limited to trusted users and additional authentication mechanisms such as two-factor authentication should be implemented to minimize the impact of potential session hijacking attacks. Organizations should also consider implementing automated vulnerability scanning tools that can detect similar input validation flaws across their web applications, as this type of vulnerability often indicates broader architectural issues in web application security design.