CVE-2024-37166 in ghtml
Summary
by MITRE • 06/11/2024
ghtml is software that uses tagged templates for template engine functionality. It is possible to introduce user-controlled JavaScript code and trigger a Cross-Site Scripting (XSS) vulnerability in some cases. Version 2.0.0 introduces changes to mitigate this issue. Version 2.0.0 contains updated documentation to clarify that while ghtml escapes characters with special meaning in HTML, it does not provide comprehensive protection against all types of XSS attacks in every scenario. This aligns with the approach taken by other template engines. Developers should be cautious and take additional measures to sanitize user input and prevent potential vulnerabilities. Additionally, the backtick character (`) is now also escaped to prevent the creation of strings in most cases where a malicious actor somehow gains the ability to write JavaScript. This does not provide comprehensive protection either.
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Analysis
by VulDB Data Team • 03/24/2025
The ghtml template engine vulnerability CVE-2024-37166 represents a significant cross-site scripting weakness that affects developers using this tagging template system. This vulnerability stems from the software's incomplete approach to HTML sanitization and input handling, creating potential attack vectors where malicious actors can inject JavaScript code through user-controlled template parameters. The issue manifests when the template engine fails to adequately protect against XSS attacks, particularly in scenarios where user input is directly incorporated into template rendering without proper security measures. The vulnerability affects the core functionality of the template engine by allowing arbitrary code execution through carefully crafted input sequences that bypass existing sanitization mechanisms.
The technical flaw in ghtml version 2.0.0 and earlier releases demonstrates a fundamental gap in the security model of the template engine, where the system escapes characters with special HTML meaning but does not provide comprehensive protection against all XSS attack vectors. This design decision places the burden of security implementation on developers who may not fully understand the complexity of XSS prevention or may overlook necessary security measures during application development. The vulnerability classification aligns with CWE-79: Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly sanitize user input that can lead to XSS attacks. The issue also relates to CWE-1004: Security Weaknesses in Template Engines, highlighting the inherent risks in template processing systems that do not provide robust protection against code injection.
The operational impact of CVE-2024-37166 extends beyond simple script injection, potentially allowing attackers to execute malicious code in the context of affected applications. This vulnerability can be exploited through various attack vectors including but not limited to DOM-based XSS, reflected XSS, and stored XSS scenarios. The attack surface is particularly concerning because it affects template engine functionality that is widely used in web applications, potentially compromising user sessions, stealing sensitive data, or redirecting users to malicious sites. According to ATT&CK framework's T1203: Exploitation for Client Execution, this vulnerability represents a critical attack surface that allows adversaries to execute malicious code on victim systems through web application interfaces. The impact is amplified when developers rely solely on the template engine's built-in escaping mechanisms without implementing additional security controls.
The vendor's response in version 2.0.0 addresses the immediate concern by updating documentation to clarify the limitations of the existing escaping mechanisms while introducing additional protection for the backtick character. This character escaping enhancement provides partial protection against JavaScript string creation but does not offer comprehensive XSS defense, as explicitly stated in the security advisory. The recommended mitigation strategy emphasizes the need for developers to implement additional input sanitization measures and security controls beyond the template engine's built-in protections. Organizations should consider implementing Content Security Policy headers, input validation, and output encoding at multiple layers of their applications. The vulnerability also highlights the importance of following security best practices such as those outlined in OWASP's Web Application Security Testing Guide, which recommends comprehensive input validation and output encoding as fundamental defenses against XSS attacks. The security community recognizes that template engines like ghtml must balance usability with security, and this vulnerability demonstrates the critical need for clear documentation of security limitations and proper developer education on implementing comprehensive XSS protection strategies.