CVE-2024-37372: Path Traversal Vulnerability

CVE-2024-37372 Overview

CVE-2024-37372 is a Path Traversal vulnerability affecting the Node.js Permission Model. The vulnerability stems from an incorrect assumption in the permission system's path parsing logic, where it presumes that any path starting with two backslashes (\\) has a four-character prefix that can be safely ignored. This assumption does not hold true in all cases, creating vulnerable edge cases that could allow unauthorized file system access.

Critical Impact

This vulnerability enables potential bypass of the Permission Model's file system access controls through specially crafted paths, potentially allowing unauthorized read or write access to protected directories.

Affected Products

• Node.js (versions with Permission Model feature)
• Applications utilizing Node.js Permission Model for file system access control

Discovery Timeline

• January 9, 2025 - CVE-2024-37372 published to NVD
• May 2, 2025 - Last updated in NVD database

Technical Details for CVE-2024-37372

Vulnerability Analysis

This vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as Path Traversal. The flaw exists within the Node.js Permission Model's path validation logic, which is designed to restrict file system access based on configured permissions.

The Permission Model incorrectly handles certain Windows-style UNC (Universal Naming Convention) paths. When processing paths that begin with double backslashes (\\), the model assumes these paths always contain a four-character prefix (typically representing the UNC prefix like \\.\ or \\?\). However, this assumption fails for edge cases where the path structure deviates from this expected format.

The local attack vector requires user interaction and presents a high attack complexity, indicating that successful exploitation requires specific conditions to be met. An attacker must craft malicious path inputs that exploit the parsing inconsistency to potentially access files outside the permitted directory scope.

Root Cause

The root cause lies in the inadequate path normalization and validation logic within the Permission Model. The code fails to properly handle all variations of Windows path formats, particularly edge cases where paths begin with double backslashes but do not conform to the expected four-character prefix pattern. This creates a discrepancy between what the Permission Model believes it is permitting access to and the actual file system location being accessed.

Attack Vector

The attack vector is local, requiring an attacker to have some level of access to the system or application using the vulnerable Permission Model. Exploitation involves:

1. Identifying an application using Node.js Permission Model with file system restrictions
2. Crafting a specially formatted path that begins with double backslashes but deviates from the expected UNC format
3. Submitting this malicious path through application inputs that interact with the Permission Model
4. Bypassing the intended directory restrictions to access protected files

The vulnerability requires user interaction and high attack complexity, meaning successful exploitation depends on specific application configurations and user actions.

Detection Methods for CVE-2024-37372

Indicators of Compromise

• Unusual file access patterns involving paths with double backslash prefixes
• Application logs showing file operations on paths outside permitted directories
• Permission Model bypass attempts in security audit logs

Detection Strategies

• Monitor for file system access attempts using malformed UNC-style paths
• Implement logging for all Permission Model access decisions and review for anomalies
• Deploy file integrity monitoring on sensitive directories that should be protected by the Permission Model

Monitoring Recommendations

• Enable verbose logging for Node.js Permission Model operations
• Set up alerts for file access attempts outside configured permission boundaries
• Review application inputs for unusual path formatting patterns

How to Mitigate CVE-2024-37372

Immediate Actions Required

• Update Node.js to the latest patched version that addresses this vulnerability
• Audit applications using the Permission Model to identify potential exposure
• Implement additional input validation for file paths before they reach the Permission Model
• Consider implementing defense-in-depth measures such as OS-level file permissions

Patch Information

Security patches addressing this vulnerability have been released. System administrators should consult the official Node.js security advisories and the NetApp Security Advisory NTAP-20250502-0010 for specific version information and patch details. Additional technical information is available through the OpenWall OSS Security Update and OpenWall OSS Security Notice.

Workarounds

• Implement additional path canonicalization and validation before passing paths to the Permission Model
• Use OS-level file permissions as a secondary access control mechanism
• Restrict application file system access to absolute minimum required paths
• Deploy application-level input sanitization to reject suspicious path patterns