CVE-2013-5961 in Lazy SEO
Summary
by MITRE
Unrestricted file upload vulnerability in lazyseo.php in the Lazy SEO plugin 1.1.9 for WordPress allows remote attackers to execute arbitrary PHP code by uploading a PHP file, then accessing it via a direct request to the file in lazy-seo/.
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Analysis
by VulDB Data Team • 12/23/2024
The vulnerability identified as CVE-2013-5961 represents a critical security flaw in the Lazy SEO WordPress plugin version 1.1.9 that enables remote code execution through unrestricted file upload capabilities. This vulnerability stems from insufficient input validation and sanitization mechanisms within the lazyseo.php script, which fails to properly verify the file types being uploaded to the web server. The flaw creates an exploitable entry point where malicious actors can bypass normal security restrictions and upload malicious PHP files directly to the target system.
The technical implementation of this vulnerability allows attackers to upload PHP files without proper authorization checks, enabling them to execute arbitrary code on the affected WordPress installation. The vulnerability specifically affects the lazy-seo directory where uploaded files are stored, making it possible for attackers to directly request these files and execute their contents. This unrestricted file upload mechanism violates fundamental security principles and creates a persistent threat vector that can be exploited repeatedly.
From an operational perspective, this vulnerability presents significant risks to WordPress installations using the affected plugin version. Attackers can leverage this flaw to gain unauthorized access to the web server, potentially leading to complete system compromise, data exfiltration, or the establishment of persistent backdoors. The vulnerability is particularly dangerous because it requires minimal privileges to exploit and can be automated, making it attractive to both skilled and less sophisticated attackers. The impact extends beyond immediate code execution to include potential privilege escalation and lateral movement within network environments.
The vulnerability aligns with CWE-434, which describes the weakness of unrestricted upload of file with dangerous type, and maps to ATT&CK technique T1190 for exploiting vulnerabilities in web applications. Organizations should immediately implement mitigations including plugin updates to versions that address the file upload validation issues, implementing proper file type restrictions, and deploying web application firewalls to detect and block malicious upload attempts. Additionally, administrators should conduct thorough security audits of their WordPress installations, review file permissions, and monitor upload directories for suspicious activity to prevent exploitation of this vulnerability.
The broader implications of this vulnerability highlight the importance of proper input validation and secure coding practices in web applications. It demonstrates how seemingly minor security oversights in plugin development can create significant risks for entire web infrastructures. Regular security assessments and prompt patch management are essential defensive measures that organizations must implement to protect against similar vulnerabilities in their WordPress environments and other web applications.