Y9FileController Path Traversal & Unrestricted File Upload Vulnerability Analysis

Vulnerability Overview The screenshot of this web page displays a Java file named , which contains multiple API interfaces related to file operations. These interfaces have potential security vulnerabilities, primarily involving path traversal and file upload functionalities. Scope of Impact Path Traversal: In the , , , , and methods, user-provided file paths ( and ) are not sufficiently validated, potentially allowing attackers to access or delete arbitrary files on the server by constructing malicious paths. File Upload: In the method, uploaded files are not strictly restricted by type or size, potentially allowing malicious files to be uploaded to the server. Remediation 1. Path Traversal: - Perform strict validation on all user-provided file paths to ensure they do not contain illegal characters or path traversal sequences (such as ). - Implement a whitelist mechanism that only allows access to predefined safe directories. 2. File Upload: - Enforce strict restrictions on the type and size of uploaded files, allowing only specific types of files (such as images, documents, etc.). - Scan the content of uploaded files to prevent the upload of malicious files. POC Code The following is a sample POC code that may exploit the above vulnerabilities: Summary Multiple API interfaces in the file contain path traversal and file upload vulnerabilities, which may lead to arbitrary files on the server being accessed or deleted, or the upload of malicious files. It is recommended to implement the above remediation measures as soon as possible to ensure system security.

Goal Reached Thanks to every supporter — we hit 100%!

Y9FileController Path Traversal & Unrestricted File Upload Vulnerability Analysis

More from this source