CVE-2012-0287 in WordPress
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in wp-comments-post.php in WordPress 3.3.x before 3.3.1, when Internet Explorer is used, allows remote attackers to inject arbitrary web script or HTML via the query string in a POST operation that is not properly handled by the "Duplicate comment detected" feature.
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Analysis
by VulDB Data Team • 03/20/2021
The CVE-2012-0287 vulnerability represents a critical cross-site scripting flaw in WordPress versions 3.3.x prior to 3.3.1, specifically affecting users of Internet Explorer browsers. This vulnerability exploits a weakness in the wp-comments-post.php script's handling of duplicate comment detection functionality, creating a pathway for remote attackers to execute malicious web scripts or HTML code within the context of affected websites. The flaw demonstrates how seemingly benign comment submission processes can become attack vectors when proper input validation and output sanitization mechanisms are absent or insufficient.
The technical exploitation of this vulnerability occurs through a POST operation that includes malicious query string parameters, which are not adequately filtered or escaped when the system detects duplicate comments. When Internet Explorer processes the response containing these improperly handled inputs, it executes the injected malicious code as part of the webpage rendering process. This behavior aligns with CWE-79, which specifically addresses cross-site scripting vulnerabilities where untrusted data is improperly handled during web page generation. The vulnerability specifically targets the comment submission mechanism, leveraging the system's duplicate detection feature as an attack surface rather than direct input fields.
The operational impact of this vulnerability extends beyond simple script injection, potentially allowing attackers to hijack user sessions, steal cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. In WordPress environments, this could lead to complete compromise of user accounts, unauthorized content modification, or the establishment of persistent backdoors through malicious comment injection. The Internet Explorer-specific nature of the vulnerability suggests that the browser's particular handling of certain HTML elements or JavaScript execution contexts creates an exploitable condition that may not manifest in other browsers, though this does not diminish the severity of the issue for affected users.
Mitigation strategies for CVE-2012-0287 require immediate patching to WordPress version 3.3.1 or later, which addresses the improper handling of duplicate comment detection. Organizations should also implement comprehensive input validation and output sanitization measures, particularly around comment submission processes, and consider deploying web application firewalls to detect and block suspicious query string parameters. The vulnerability highlights the importance of proper security testing for edge cases in web application functionality, particularly features that handle user-generated content and duplicate detection scenarios. Additionally, administrators should monitor their WordPress installations for similar vulnerabilities in other components and maintain updated security practices to prevent exploitation of similar weaknesses in the broader WordPress ecosystem. This vulnerability serves as a reminder of the critical importance of validating and sanitizing all user inputs, particularly in content management systems where user participation is integral to platform functionality, and demonstrates how seemingly minor features can become significant security risks when proper defensive coding practices are not implemented.