CVE-2018-3727 in 626
Summary
by MITRE
626 node module suffers from a Path Traversal vulnerability due to lack of validation of file, which allows a malicious user to read content of any file with known path.
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Analysis
by VulDB Data Team • 02/17/2020
The CVE-2018-3727 vulnerability affects the 626 node module, a popular npm package used for file system operations in node.js applications. This vulnerability represents a critical path traversal flaw that stems from inadequate input validation within the module's file handling mechanisms. The vulnerability allows attackers to access arbitrary files on the system by manipulating file paths, potentially leading to sensitive data exposure and system compromise. The issue manifests when the module processes user-supplied file paths without proper sanitization or validation, creating an avenue for malicious actors to bypass normal file access controls.
The technical implementation of this vulnerability resides in the module's failure to properly validate file paths before processing them. When a user provides a file path parameter, the 626 module does not adequately check for directory traversal sequences such as ../ or ..\ that could allow access to files outside the intended directory scope. This weakness enables attackers to construct malicious paths that traverse the file system hierarchy, potentially accessing configuration files, source code, database credentials, or other sensitive information. The vulnerability is particularly dangerous because it operates at the file system level, bypassing application-level access controls and potentially exposing the entire file system to unauthorized access.
The operational impact of CVE-2018-3727 extends beyond simple data theft, as it can lead to complete system compromise when combined with other vulnerabilities or attack vectors. An attacker who successfully exploits this vulnerability can access not only application files but potentially system configuration files, user data, and sensitive environment variables. This exposure can result in privilege escalation, data breaches, and the potential for further lateral movement within the network. The vulnerability affects any application that uses the 626 module for file operations, making it particularly concerning for web applications, APIs, and services that handle user input for file system operations. Organizations using this module are at risk of exposure to attackers who may use this vulnerability to gain unauthorized access to critical system resources.
Mitigation strategies for CVE-2018-3727 should focus on immediate remediation through module updates and implementation of proper input validation. The primary fix involves updating to a patched version of the 626 module that properly validates file paths and prevents directory traversal attacks. Organizations should also implement defensive programming practices such as canonicalizing file paths, using whitelist validation for file names, and implementing proper access controls for file system operations. Additionally, network segmentation and monitoring can help detect unusual file access patterns that might indicate exploitation attempts. This vulnerability aligns with CWE-22 Path Traversal and follows patterns described in ATT&CK technique T1074 Data Staged, as attackers can use path traversal to access and exfiltrate sensitive data from systems. The remediation process should include thorough code reviews to identify other potential path traversal vulnerabilities in the application's file handling code and implementation of proper security controls to prevent similar issues in the future.