A critical vulnerability, designated as CVE-2025-0401, has been discovered in the popular 1902756969 Reggie 1. package. This vulnerability affects the "download" function within the src/main/java/com/itheima/reggie/controller/CommonController.java file. The vulnerability is a path traversal issue, which can allow an attacker to remotely gain unauthorized access to sensitive data on the server hosting the application.

The affected code snippet in the "CommonController.java" file is as follows

@RequestMapping("download")
public ResponseEntity download(HttpServletResponse response, HttpServletRequest request, String name) throws IOException {
    ...
    String path = "/resources/" + name;
    ...
    InputStream is = resourceLoader.getResource(path).getInputStream();
    ...
}

As shown above, the issue lies in the processing of the "name" argument that is passed to the "download" function.

Exploit Details

Attackers can exploit the path traversal vulnerability by manipulating the "name" argument through a crafted request. This allows unauthorized access to sensitive data on the server by traversing directory structures and reading arbitrary files. The following payload could be used to exploit this flaw:

GET /download?name=../sensitive_folder/sensitive_file.txt HTTP/1.1
Host: target_server

By sending this request, the attacker will be able to access and download the "sensitive_file.txt" located in the "sensitive_folder" directory on the server.

This vulnerability was initially reported through the following sources

- National Vulnerability Database (NVD)
- MITRE CVE entry

To mitigate the risk and fix this vulnerability, several steps can be taken, such as

1. Implement proper input validation on the "name" argument to ensure that only allowed characters and patterns can be passed to the "download()" function. For example, do not allow characters like "../" in the input.

2. Create a whitelist of allowed files or folders that can be accessed by the "download()" function. Ensure the application restricts access to only those files specified in the whitelist.

Update 1902756969 Reggie to a patched version while resolving the security flaw, if available.

Please be advised that this exploit has been publicly disclosed, and malicious actors may try to take advantage of this vulnerability. It is imperative to apply the necessary security measures immediately to avoid any potential incidents.

Timeline

Published on: 01/13/2025 00:15:06 UTC