CVE-2018-18434 in litemall
Summary
by MITRE
An issue was discovered in litemall 0.9.0. Arbitrary file download is possible via ../ directory traversal in linlinjava/litemall/wx/web/WxStorageController.java in the litemall-wx-api component.
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Analysis
by VulDB Data Team • 09/11/2025
The vulnerability identified as CVE-2018-18434 represents a critical directory traversal flaw within the litemall e-commerce platform version 0.9.0. This issue specifically affects the litemall-wx-api component where the WxStorageController.java file fails to properly validate user input when processing file download requests. The vulnerability stems from insufficient sanitization of file paths that allows attackers to manipulate directory navigation sequences using the ../ pattern to access files outside the intended download directory. This represents a classic directory traversal attack vector that violates fundamental security principles of access control and input validation.
The technical exploitation of this vulnerability occurs through the manipulation of file path parameters in the WxStorageController component, which processes requests for downloading stored files within the application's storage system. When a user submits a request containing directory traversal sequences, the application fails to properly sanitize or validate these inputs before constructing file system paths. This allows an attacker to navigate to arbitrary directories on the server filesystem and potentially download sensitive files such as configuration files, database credentials, application source code, or other privileged information. The vulnerability directly maps to CWE-22 which defines improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it can potentially lead to complete system compromise when combined with other attack vectors. An attacker who successfully exploits this vulnerability can gain access to sensitive application data, potentially including customer information, payment details, and administrative credentials stored in configuration files. The attack surface is particularly concerning in web applications where file storage components are exposed to external users without proper access controls. This vulnerability aligns with ATT&CK technique T1074.001 which describes data staging through the use of remote access tools and file system access to gather sensitive information from compromised systems.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and sanitization mechanisms within the application's file handling components. The most effective approach involves implementing strict path validation that ensures all file paths are resolved within the intended directory boundaries and rejects any input containing directory traversal sequences. Organizations should also implement proper access controls and authentication mechanisms to limit who can access the storage API endpoints. Additionally, regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities in other components of the application. The implementation of web application firewalls and security monitoring systems can provide additional layers of protection by detecting and blocking suspicious directory traversal attempts. Security patches should be applied immediately upon availability, and application developers should follow secure coding practices that prevent path traversal vulnerabilities through proper input validation and output encoding techniques.