The Common Vulnerabilities and Exposures (CVE) system is an important tool for cataloging and classifying known software vulnerabilities. A new entry, CVE-2022-43275, has been assigned to a recently discovered vulnerability in the Canteen Management System v1.. This vulnerability allows attackers to upload arbitrary code via a crafted PHP file. In this post, we'll look at the details of the vulnerability, provide code snippets for potential exploit, and link original references to help administrators and developers protect their systems.

Vulnerability Details

The Canteen Management System v1., a popular software solution for managing canteen services, has been found to have an arbitrary file upload vulnerability. This vulnerability is present in the /youthappam/php_action/editProductImage.php file. It allows attackers to upload any file, including malicious PHP code, which can then be executed on the server hosting the Canteen Management System.

This exploit is possible because the editProductImage.php script does not properly validate the user-uploaded file or its type. Instead, it blindly accepts the uploaded file and saves it to a specified location. An attacker can thus craft a malicious PHP file that can execute arbitrary code when accessed, giving them significant control over the server.

The vulnerability is caused by the following code snippet

if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
  // ...
}

This code snippet is problematic, as it does not properly validate the type of the uploaded file and does not check whether the user uploading the file is authorized to do so.

An attacker can exploit this vulnerability by crafting a malicious PHP file, such as the following

<?php
  $cmd = $_GET['cmd'];
  system($cmd);
?>


This file would allow an attacker to execute arbitrary commands on the server, if successfully uploaded to the server. To use it, the attacker will provide the 'cmd' parameter in the URL, for example:

http://target_url.com/path/to/uploaded/file.php?cmd=whoami

Original References

- Official CVE-2022-43275 page
- Exploit-DB Entry

To protect your Canteen Management System from this vulnerability, administrators and developers should take the following steps:

1. Update the affected system to the latest version. As of now, there is no official patch for this vulnerability. However, monitoring the Canteen Management System repository and applying updates as they become available is crucial to minimize the risk.
2. Implement proper file validation in the editProductImage.php script. Ensure that only authorized file types (e.g., image files) can be uploaded and verify that an authenticated user is performing the action.
3. Employ proper user access controls and authentication mechanisms to protect the Canteen Management System v1. from unauthorized usage.

Conclusion

CVE-2022-43275 is a critical vulnerability in the Canteen Management System v1. that allows attackers to execute arbitrary code by exploiting an arbitrary file upload vulnerability. Stay informed of updates to Canteen Management System and implement the mitigations outlined above to protect your systems. Stay safe!

Timeline

Published on: 10/28/2022 14:15:00 UTC
Last modified on: 10/28/2022 18:27:00 UTC