CVE-2013-0236 in WordPress
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in WordPress before 3.5.1 allow remote attackers to inject arbitrary web script or HTML via vectors involving (1) gallery shortcodes or (2) the content of a post.
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Analysis
by VulDB Data Team • 01/03/2022
The vulnerability identified as CVE-2013-0236 represents a critical cross-site scripting flaw affecting WordPress versions prior to 3.5.1. This vulnerability exposes WordPress installations to remote code execution risks through malicious script injection, making it a significant concern for web application security. The flaw manifests in two primary attack vectors involving gallery shortcodes and post content manipulation, creating multiple entry points for malicious actors to compromise affected systems. The vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically targeting the improper handling of user-supplied input in web applications. This weakness enables attackers to execute arbitrary scripts in the context of a victim's browser session, potentially leading to session hijacking, data theft, or further exploitation of the compromised system.
The technical implementation of this vulnerability stems from insufficient input validation and output sanitization within WordPress's shortcode processing mechanisms and post content handling systems. When gallery shortcodes are processed or post content is rendered, the application fails to properly escape or filter user-provided data before incorporating it into the HTML output. This inadequate sanitization creates opportunities for attackers to inject malicious JavaScript code through carefully crafted gallery parameters or post content that gets executed when legitimate users view the affected pages. The vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be leveraged by anyone with access to the WordPress administration interface or by exploiting other initial access vectors.
The operational impact of CVE-2013-0236 extends beyond simple script injection, as successful exploitation can lead to complete compromise of user sessions and potential data breaches. Attackers can craft malicious gallery shortcodes or post content that, when viewed by authenticated users, executes scripts that steal cookies, redirect users to malicious sites, or perform unauthorized actions on behalf of the victim. This vulnerability directly aligns with ATT&CK technique T1566.001 for initial access through malicious web content and can facilitate subsequent lateral movement within compromised networks. The attack surface is particularly broad as it affects core WordPress functionality that is widely used across millions of websites, making the potential impact of exploitation significant for both individual users and organizations relying on WordPress platforms.
Mitigation strategies for CVE-2013-0236 primarily focus on immediate patching of WordPress installations to version 3.5.1 or later, which contains the necessary security fixes for the identified XSS vulnerabilities. Organizations should implement comprehensive input validation measures, including the use of Content Security Policy headers to limit script execution, and ensure that all user-generated content is properly escaped before rendering. Additionally, administrators should conduct regular security audits of their WordPress installations, monitor for suspicious shortcode usage, and maintain updated security configurations. The vulnerability demonstrates the importance of proper output encoding and input validation practices as outlined in OWASP Top Ten security principles, particularly focusing on preventing XSS vulnerabilities through proper sanitization of user inputs and ensuring that all dynamic content is properly escaped before being included in web responses.