CVE-2014-9443 in Relevanssi
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Relevanssi plugin before 3.3.8 for WordPress allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 04/06/2018
The CVE-2014-9443 vulnerability represents a critical cross-site scripting flaw within the Relevanssi plugin for WordPress systems. This vulnerability affected versions prior to 3.3.8 and created a significant security risk for WordPress installations that utilized this popular search plugin. The flaw allowed remote attackers to inject malicious web scripts or HTML content into the targeted system, potentially compromising user sessions and data integrity. The vulnerability was classified under CWE-79 which specifically addresses cross-site scripting attacks, making it a well-documented and dangerous class of security flaw in web applications. The Relevanssi plugin, designed to enhance WordPress search functionality, became a vector for malicious code execution when proper input validation was not implemented.
The technical implementation of this vulnerability stemmed from inadequate sanitization of user inputs within the plugin's codebase. Attackers could exploit unspecified vectors within the plugin's processing logic to inject malicious payloads that would execute in the context of other users' browsers. This type of vulnerability typically occurs when web applications fail to properly validate, filter, or encode user-supplied data before rendering it in web pages. The unspecified nature of the attack vectors suggests that multiple entry points within the plugin's functionality could be exploited, making the vulnerability particularly dangerous as it could be triggered through various user interactions with the search feature. The vulnerability's classification aligns with ATT&CK technique T1566 which covers phishing with malicious attachments or links, as the XSS could be used to deliver malicious payloads to unsuspecting users.
The operational impact of this vulnerability extended beyond simple script injection, as it could enable attackers to steal session cookies, redirect users to malicious sites, or even modify content displayed to other users. WordPress administrators using vulnerable versions of Relevanssi faced potential compromise of their entire blogging platform, as the vulnerability could be exploited to gain unauthorized access to user accounts or manipulate search results. The attack surface was particularly concerning given that Relevanssi was a widely used plugin, meaning that a large number of WordPress installations were potentially exposed to this threat. Organizations relying on WordPress for content management needed to understand that this vulnerability could be leveraged to conduct more sophisticated attacks including credential theft, data exfiltration, or the establishment of persistent access points within their web infrastructure.
Mitigation strategies for CVE-2014-9443 required immediate patching of the Relevanssi plugin to version 3.3.8 or later, which contained the necessary input validation and sanitization measures. System administrators should have implemented comprehensive monitoring of their WordPress installations to detect any signs of exploitation attempts, including unusual search queries or suspicious user activities. The vulnerability highlighted the importance of maintaining up-to-date plugins and themes within WordPress environments, as outdated components often represent the most common attack vectors for web application exploitation. Security best practices recommended that organizations implement Content Security Policy headers to provide additional defense-in-depth against XSS attacks, while also establishing regular vulnerability scanning procedures to identify other potential weaknesses in their WordPress installations. The incident underscored the critical need for developers to follow secure coding practices and for organizations to maintain robust patch management processes to protect against known vulnerabilities in third-party components.