CVE-2017-14721 in WordPress
Summary
by MITRE
Before version 4.8.2, WordPress allowed Cross-Site scripting in the plugin editor via a crafted plugin name.
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Analysis
by VulDB Data Team • 01/14/2021
The vulnerability identified as CVE-2017-14721 represents a critical cross-site scripting flaw within the WordPress content management system that existed prior to version 4.8.2. This vulnerability specifically affects the plugin editor functionality, which is a core administrative feature designed to allow users to modify plugin files directly through the WordPress dashboard. The issue stems from insufficient input validation and sanitization mechanisms that fail to properly handle maliciously crafted plugin names, creating an avenue for attackers to inject malicious scripts into the system.
The technical exploitation of this vulnerability occurs when an attacker manipulates the plugin name parameter within the plugin editor interface. WordPress fails to adequately sanitize user-supplied input, allowing special characters and script tags to be processed without proper encoding or filtering. This weakness enables an attacker to inject malicious javascript code that executes within the context of other users' browsers when they navigate to the affected plugin editor page. The vulnerability is particularly dangerous because it leverages the administrative privileges of WordPress users, potentially allowing attackers to escalate their privileges or execute arbitrary commands within the WordPress environment.
From an operational impact perspective, this vulnerability exposes WordPress installations to significant security risks that can lead to complete system compromise. An attacker who successfully exploits this XSS vulnerability can steal session cookies, perform actions on behalf of authenticated users, and potentially gain access to sensitive administrative functions. The vulnerability affects the core WordPress plugin editor functionality, which is frequently used by administrators for managing site plugins, making it a high-value target for exploitation. The impact extends beyond simple script execution as it can enable more sophisticated attacks such as credential theft, data exfiltration, and persistent backdoor installation.
The vulnerability aligns with CWE-79, which describes cross-site scripting flaws in web applications, and demonstrates the importance of proper input validation and output encoding in web security. From the MITRE ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and privilege escalation through web application exploitation. Organizations using vulnerable WordPress versions face increased risk of data breaches, as attackers can leverage this vulnerability to establish persistent access to their systems. The exploitation requires minimal technical skill and can be automated, making it particularly dangerous for widespread deployment.
Mitigation strategies for this vulnerability require immediate patching of WordPress installations to version 4.8.2 or later, which includes proper input sanitization for plugin names in the editor interface. Security administrators should also implement additional protective measures including web application firewalls, input validation rules, and regular security audits of WordPress installations. Network segmentation and privileged access controls can help limit the potential impact if exploitation occurs. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates. Regular security training for administrators can help identify potential exploitation attempts and maintain awareness of emerging threats targeting WordPress systems. The vulnerability underscores the critical importance of keeping web applications updated and maintaining robust input validation mechanisms to prevent similar issues in the future.