CVE-2018-3731 in public Module
Summary
by MITRE
public node module suffers from a Path Traversal vulnerability due to lack of validation of filePath, 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 vulnerability identified as CVE-2018-3731 represents a critical path traversal flaw within a public node module that has significant implications for system security and data integrity. This vulnerability stems from insufficient input validation mechanisms that fail to properly sanitize file path parameters, creating an exploitable condition where malicious actors can manipulate file access requests to gain unauthorized read access to arbitrary files on the system. The flaw specifically targets the filePath parameter handling within the module's file operations, allowing attackers to construct malicious paths that bypass normal access controls and traverse directory structures to access sensitive files that should remain protected.
The technical implementation of this vulnerability aligns with CWE-22, which categorizes path traversal attacks as a fundamental weakness in input validation and access control mechanisms. Attackers can exploit this condition by crafting specially formatted file paths that include directory traversal sequences such as '../' or similar constructs that allow them to navigate outside the intended directory boundaries. When the vulnerable module processes these malicious paths without proper validation, it executes file operations against the attacker-controlled paths, potentially exposing system files, configuration data, application source code, or other sensitive information. The vulnerability operates at the application layer and can be particularly dangerous in environments where the module runs with elevated privileges or has access to sensitive system resources.
The operational impact of CVE-2018-3731 extends beyond simple unauthorized file access, as it can enable more sophisticated attack vectors including information disclosure, privilege escalation, and potential system compromise. Depending on the system configuration and the module's execution context, attackers may be able to access database connection files, application secrets, user credentials, or system configuration files that could facilitate further exploitation. The vulnerability is particularly concerning in web applications where the module might be exposed to untrusted user input, as it could allow attackers to extract sensitive data from the server or gain insights into the application's internal structure and security configuration. This type of vulnerability is often categorized under the ATT&CK framework as part of the credential access and reconnaissance phases, where adversaries seek to gather information about the target system and its data assets.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and sanitization mechanisms that properly validate all file path parameters before processing. Developers should employ whitelisting approaches where possible, restricting file access to predefined safe directories and file patterns. Additionally, the module should implement proper path normalization and validation techniques that reject or sanitize any input containing traversal sequences. Security best practices recommend using secure coding standards that enforce strict access control and validate all external inputs, including file paths, to prevent directory traversal attacks. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other components and ensure that proper input validation mechanisms are consistently applied throughout the application stack. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts, while maintaining up-to-date dependency management practices to ensure timely patching of known vulnerabilities.