CVE-2024-56246 in Nexter Blocks Plugin
Summary
by MITRE • 01/02/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in POSIMYTH Nexter Blocks allows DOM-Based XSS.This issue affects Nexter Blocks: from n/a through 4.0.4.
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Analysis
by VulDB Data Team • 02/16/2025
The CVE-2024-56246 vulnerability represents a critical cross-site scripting flaw within the POSIMYTH Nexter Blocks plugin, specifically manifesting as a DOM-based XSS vulnerability that undermines web application security. This vulnerability occurs during the web page generation process when input data is improperly neutralized, creating an attack vector that allows malicious actors to inject client-side scripts into web pages viewed by other users. The issue affects all versions of the Nexter Blocks plugin from the initial release through version 4.0.4, indicating a persistent flaw that has not been adequately addressed in the plugin's codebase. The vulnerability's classification as DOM-based XSS means that the malicious script is executed within the victim's browser context without being sent to the server, making it particularly insidious as it can bypass traditional server-side input validation mechanisms.
The technical exploitation of this vulnerability stems from the plugin's failure to properly sanitize or escape user input before incorporating it into the dynamic content generation process. When users interact with the plugin's functionality, particularly in contexts where user-provided data is used to construct DOM elements or JavaScript code, the absence of proper input validation creates opportunities for attackers to inject malicious scripts. This flaw falls under CWE-79, which specifically addresses Cross-Site Scripting vulnerabilities, and aligns with ATT&CK technique T1059.007 for Scripting, as it enables attackers to execute malicious scripts within the victim's browser environment. The DOM-based nature of the vulnerability means that the attack vector operates entirely within the client-side DOM structure, making it more difficult to detect through conventional network monitoring approaches and allowing for more sophisticated attack payloads that can manipulate the page's behavior, steal session cookies, or redirect users to malicious sites.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform session hijacking, data theft, and user manipulation within the context of the affected website. When exploited, the vulnerability could allow attackers to access user sessions, modify content displayed to other users, or redirect them to phishing sites designed to capture credentials. The broad version range of affected software indicates that a significant number of users may be exposed to this risk, particularly those running older versions of the plugin. Attackers can leverage this vulnerability through various means including social engineering campaigns, compromised user accounts, or by exploiting the vulnerability in conjunction with other weaknesses within the web application ecosystem. The impact is particularly concerning for websites that rely heavily on user-generated content or dynamic page elements, as these environments provide the most opportunities for input injection.
Mitigation strategies for CVE-2024-56246 should prioritize immediate plugin updates to versions that address the XSS vulnerability, as this represents the most effective defense against exploitation. Organizations should implement comprehensive input validation and output encoding mechanisms to prevent the injection of malicious scripts into web pages, ensuring that all user-provided data is properly sanitized before being incorporated into the DOM structure. Security measures should include the implementation of Content Security Policies that restrict script execution and prevent unauthorized code injection, alongside regular security audits of web applications to identify similar vulnerabilities. Additionally, organizations should consider deploying web application firewalls to detect and block suspicious input patterns that could indicate exploitation attempts, while maintaining detailed monitoring of user activity and web application logs for signs of unauthorized access or malicious script execution. The vulnerability's classification as a persistent issue across multiple versions underscores the importance of regular security assessments and prompt patch management procedures to protect against evolving threats in the web application landscape.