CVE-2014-4550 in Shortcode Ninja Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in preview-shortcode-external.php in the Shortcode Ninja plugin 1.4 and earlier for WordPress allows remote attackers to inject arbitrary web script or HTML via the shortcode parameter.
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Analysis
by VulDB Data Team • 03/18/2024
The CVE-2014-4550 vulnerability represents a critical cross-site scripting flaw within the Shortcode Ninja WordPress plugin version 1.4 and earlier. This vulnerability resides in the preview-shortcode-external.php file and specifically targets the handling of the shortcode parameter. The flaw enables remote attackers to execute malicious web scripts or HTML code within the context of a victim's browser session, exploiting the plugin's insufficient input validation and output sanitization mechanisms. Such vulnerabilities are particularly dangerous in content management systems like WordPress where user-generated content and plugin functionality can be leveraged to compromise entire sites and user bases.
The technical implementation of this XSS vulnerability stems from the plugin's failure to properly sanitize user input before rendering it in web pages. When the shortcode parameter is processed through preview-shortcode-external.php, the input undergoes inadequate validation, allowing attackers to inject malicious payloads that persist in the plugin's preview functionality. This type of vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications. The vulnerability's exploitation requires minimal prerequisites as attackers only need to craft malicious shortcode parameters and convince users to interact with the compromised plugin preview functionality, making it particularly dangerous in environments where users trust plugin previews.
The operational impact of this vulnerability extends beyond simple script injection, as it can lead to complete session hijacking, data theft, and unauthorized administrative access to WordPress installations. Attackers can leverage the XSS flaw to steal cookies, modify content, redirect users to malicious sites, or even escalate privileges within the WordPress environment. The vulnerability affects all WordPress installations using the affected Shortcode Ninja plugin version, creating widespread exposure across numerous websites. This type of attack vector is commonly categorized under the ATT&CK framework's TA0001 Initial Access and TA0002 Execution phases, demonstrating how a single vulnerable plugin can serve as an entry point for more sophisticated attacks. The vulnerability's persistence in preview functionality means that even legitimate users may unknowingly execute malicious code when viewing plugin previews, making detection and mitigation particularly challenging.
Mitigation strategies for CVE-2014-4550 should prioritize immediate plugin updates to versions that address the XSS vulnerability, as this represents the most effective remediation approach. Organizations should implement comprehensive input validation and output encoding mechanisms to prevent similar vulnerabilities in custom plugins and themes. Regular security audits of WordPress installations, including plugin and theme reviews, are essential to identify and remediate potential XSS flaws before exploitation occurs. Additionally, implementing content security policies and maintaining up-to-date security monitoring systems can provide additional defense layers against such attacks. The vulnerability underscores the importance of secure coding practices and proper input sanitization, particularly in web applications that process user-supplied data through web interfaces.