Path Traversal Vulnerability in Laranode File Manager

Laranode versions before 1.2.1 contain a critical path traversal vulnerability in the POST /filemanager/upload-file endpoint. This vulnerability allows an authenticated attacker to manipulate the 'path' parameter within a file upload request to escape the intended directory constraints. By injecting directory traversal sequences (e.g., ../), an attacker can write arbitrary files to unauthorized locations on the host filesystem. This impact is significant in multi-tenant environments, as it allows attackers to upload malicious PHP scripts into the web root of other tenants, resulting in remote code execution (RCE) in the context of those tenants. Organizations utilizing Laranode should prioritize upgrading to version 1.2.1 or later to remediate this flaw.

Impact

Successful exploitation of this vulnerability allows for unauthorized file system access and remote code execution. In multi-tenant environments, this poses a severe risk of cross-tenant data compromise and service disruption. The ability to write arbitrary files provides attackers with a mechanism to establish persistence or pivot further into the infrastructure.

Recommendation

• Upgrade all instances of Laranode to version 1.2.1 or later immediately.
• Implement strict input validation on the 'path' parameter in file upload endpoints to prevent directory traversal attempts.
• Apply the principle of least privilege to the web application process to restrict write access to sensitive directory structures outside the application's scope.
• Monitor web application logs for suspicious POST requests to /filemanager/upload-file containing directory traversal sequences such as '../'.