CVE-2024-43376 in Umbraco
Summary
by MITRE • 08/20/2024
Umbraco is an ASP.NET CMS. Some endpoints in the Management API can return stack trace information, even when Umbraco is not in debug mode. This vulnerability is fixed in 14.1.2.
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Analysis
by VulDB Data Team • 08/27/2024
The vulnerability identified as CVE-2024-43376 affects Umbraco, a widely used ASP.NET content management system that serves millions of websites globally. This security flaw resides within the Management API of the platform, where certain endpoints are susceptible to revealing sensitive stack trace information even when the system operates in production mode without debug configurations. The issue represents a significant concern for organizations relying on Umbraco for their digital presence, as it exposes internal system details that could aid attackers in understanding the application architecture and potentially identifying additional vulnerabilities.
The technical nature of this vulnerability stems from improper error handling within specific Management API endpoints. When these endpoints encounter exceptions or errors during processing, they return full stack trace information to the client instead of implementing proper error suppression mechanisms. This behavior occurs regardless of the Umbraco configuration settings, meaning that even in production environments where debug mode is disabled, the system continues to expose detailed technical information. The vulnerability manifests as a failure to properly sanitize error responses, allowing attackers to obtain insights into the underlying .NET framework components, method calls, and internal application structure. This represents a deviation from standard security practices where error information should be limited to minimal, non-sensitive details appropriate for end users while logging comprehensive technical information internally.
The operational impact of this vulnerability extends beyond simple information disclosure, as it significantly increases the attack surface for potential exploitation. Stack traces can reveal critical information including file paths, method signatures, and internal class names that attackers can leverage to craft more sophisticated attacks. This information disclosure vulnerability aligns with CWE-209, which specifically addresses the improper handling of exceptions that can lead to information leakage. The exposure of internal system details can facilitate subsequent attacks such as path traversal, directory traversal, or even application-specific exploits that target known components or methods within the Umbraco framework. Organizations using affected versions of Umbraco may unknowingly provide attackers with valuable reconnaissance data that would otherwise remain hidden in properly configured production environments.
The remediation for this vulnerability requires immediate upgrading to Umbraco version 14.1.2 or later, which includes the necessary patches to prevent stack trace information from being exposed through Management API endpoints. Security teams should implement comprehensive monitoring of API error responses to detect any remaining instances of information disclosure, while also reviewing other system components for similar error handling patterns. Organizations should conduct thorough vulnerability assessments to ensure that no other endpoints within their Umbraco installations are exhibiting similar behaviors, as this represents a broader class of issues related to improper error handling in web applications. The fix demonstrates proper application of security principles by implementing robust error suppression mechanisms that maintain system security while still providing necessary operational feedback to administrators through proper logging channels. This vulnerability also highlights the importance of adhering to ATT&CK framework concepts related to reconnaissance and initial access phases, where information disclosure vulnerabilities like this one can significantly aid threat actors in their attack planning processes.