CVE-2015-9494 in indieweb-post-kinds Plugin
Summary
by MITRE
The indieweb-post-kinds plugin before 1.3.1.1 for WordPress has XSS via the genericons/example.html anchor identifier.
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Analysis
by VulDB Data Team • 01/17/2024
The CVE-2015-9494 vulnerability affects the indieweb-post-kinds plugin for WordPress, specifically versions prior to 1.3.1.1, presenting a cross-site scripting vulnerability that exploits the plugin's handling of the genericons/example.html anchor identifier. This flaw represents a classic server-side input validation issue where user-controllable data is not properly sanitized before being rendered in web pages. The vulnerability occurs when the plugin processes the example.html file within the genericons library, which contains anchor identifiers that can be manipulated to inject malicious scripts. The affected plugin is designed to handle various post kinds for indie web publishing, but the insecure handling of these anchor elements creates a vector for attackers to execute arbitrary JavaScript code in the context of other users' browsers. This type of vulnerability falls under CWE-79, which specifically addresses cross-site scripting flaws, and demonstrates poor input sanitization practices in web application development.
The technical exploitation of this vulnerability requires an attacker to craft a malicious payload that targets the genericons/example.html file within the plugin's directory structure. When a victim visits a page that triggers the plugin to render content containing the vulnerable anchor identifier, the malicious script gets executed in the victim's browser context. The vulnerability is particularly concerning because it operates at the user interaction level, meaning that simply visiting a compromised page could lead to script execution without requiring additional authentication or privileged actions. The attack vector is facilitated by the plugin's failure to properly escape or validate anchor identifiers that are part of the genericons library, which is commonly used for icon rendering in WordPress themes and plugins. This vulnerability aligns with ATT&CK technique T1203, which describes exploitation of web applications through cross-site scripting attacks, and represents a common pattern in web security where third-party libraries introduce attack surfaces that are not adequately protected.
The operational impact of CVE-2015-9494 extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal cookies, redirect users to malicious sites, or even modify content on the affected WordPress installation. Since the vulnerability exists within a widely used plugin, the potential attack surface is significant, especially in environments where multiple users interact with the platform. The vulnerability can be particularly dangerous in blog environments where users may not be security-aware, as they might unknowingly trigger the exploit by viewing compromised content or clicking on malicious links. Additionally, the vulnerability's persistence across multiple WordPress installations means that attackers can leverage it across various sites, making it a scalable threat. The impact is further amplified because the plugin's functionality is typically integrated into core blogging workflows, meaning that exploitation can occur during normal content creation or viewing activities.
Mitigation strategies for CVE-2015-9494 should prioritize immediate plugin updates to version 1.3.1.1 or later, which contains the necessary fixes for the XSS vulnerability. System administrators should also implement proper input validation and output escaping mechanisms for all user-controllable data within the WordPress environment, particularly when dealing with third-party libraries like genericons. Regular security audits of installed plugins and themes are essential to identify similar vulnerabilities, and implementing a content security policy can provide additional protection against script execution. Organizations should also consider implementing web application firewalls to detect and block malicious payloads targeting known XSS patterns. The vulnerability highlights the importance of maintaining up-to-date software dependencies and conducting thorough security reviews of third-party components. For organizations that cannot immediately update, implementing temporary workarounds such as restricting access to the vulnerable plugin functionality or monitoring for suspicious activity can provide interim protection. This vulnerability serves as a reminder of the critical need for comprehensive security practices in WordPress environments, including regular patch management, proper input validation, and continuous monitoring for emerging threats.