CVE-2024-37457 in Gutenberg Blocks Plugin
Summary
by MITRE • 07/22/2024
Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Ultimate Blocks Ultimate Blocks – Gutenberg Blocks Plugin allows Stored XSS.This issue affects Ultimate Blocks – Gutenberg Blocks Plugin: from n/a through 3.1.9.
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Analysis
by VulDB Data Team • 03/17/2025
The vulnerability CVE-2024-37457 represents a critical security flaw in the Ultimate Blocks Gutenberg Blocks plugin that enables stored cross-site scripting attacks. This issue stems from improper input sanitization during web page generation processes, creating a pathway for malicious actors to inject persistent malicious scripts into the plugin's output. The vulnerability specifically affects versions of the plugin ranging from the initial release through version 3.1.9, indicating a prolonged window of exposure for affected systems. The flaw occurs when user-supplied input is not adequately neutralized before being rendered in web pages, allowing attackers to execute arbitrary JavaScript code in the context of other users' browsers.
This stored XSS vulnerability operates by exploiting the plugin's failure to properly sanitize user input that gets stored and subsequently rendered in web pages. When legitimate users view pages containing maliciously injected content, their browsers execute the embedded scripts, potentially leading to session hijacking, data theft, or further compromise of the affected systems. The stored nature of this vulnerability means that malicious payloads persist in the database or storage layer, making them particularly dangerous as they can affect multiple users over time without requiring repeated exploitation attempts. The vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws in web applications, and aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1059.001 for command and control through scripting.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform privilege escalation attacks, steal administrative credentials, or manipulate content displayed on the affected website. Attackers can leverage this vulnerability to create backdoors, modify content, or redirect users to malicious sites. The affected WordPress environment becomes vulnerable to persistent attacks where malicious scripts execute automatically whenever affected pages are loaded, potentially compromising all users who interact with the compromised content. Organizations running the vulnerable plugin version face significant risk of data breaches, reputational damage, and potential regulatory compliance violations due to the persistent nature of stored XSS attacks.
Mitigation strategies for this vulnerability require immediate patching of the Ultimate Blocks plugin to version 3.2.0 or later, which addresses the input sanitization issues. System administrators should conduct thorough security assessments of their WordPress installations to identify any other potentially vulnerable plugins or themes that might exhibit similar input validation flaws. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against XSS attacks by restricting script execution sources. Regular security monitoring and input validation testing should be implemented to prevent similar vulnerabilities from emerging in the future. Organizations should also consider implementing web application firewalls and conducting regular vulnerability scanning to identify and remediate potential XSS vulnerabilities across their entire web application ecosystem.