CVE-2023-27909: Exploring an Out-Of-Bounds Write Vulnerability in Autodesk® FBX® SDK 202 and Prior

In this post, we will discuss the CVE-2023-27909 vulnerability found in Autodesk® FBX® SDK version 202 and earlier versions. We will go over how the vulnerability can lead to remote code execution via maliciously crafted FBX files or information disclosure. We will also explore how to exploit the vulnerability in detail and what possible mitigation techniques can be applied.

Background

Autodesk® FBX® is a widely-used file format for 3D content, primarily in the gaming, animation, and film industries. It has a software development kit (SDK) that allows developers to integrate the FBX file format into their applications. In this case, the vulnerability is found within Autodesk® FBX® SDK itself.

Out-Of-Bounds Write Vulnerability (CVE-2023-27909)

An out-of-bounds write vulnerability is a security issue where the program writes data to a memory location outside of the intended data structure. This can lead to data corruption, crashing the application, or even remote code execution if an attacker can control the data written, and where it is written.

References

- Autodesk® FBX® SDK Documentation
- Common Vulnerabilities and Exposures (CVE) Entry

Exploit

The exploit revolves around crafting a malicious FBX file that triggers the out-of-bounds write. The attacker can then use this malicious file to execute arbitrary code or cause information disclosure.

Here is an example of a possible code snippet that may lead to the vulnerability

#include <fbxsdk.h>
#include <iostream>

int main(int argc, char** argv) {
  if (argc < 2) {
    std::cerr << "Usage: " << argv[] << " <FBX file>" << std::endl;
    return 1;
  }

  // Initialize the FBX SDK
  FbxManager* manager = FbxManager::Create();

  // Import the FBX file
  FbxImporter* importer = FbxImporter::Create(manager, "");
  if (!importer->Initialize(argv[1])) {
    std::cerr << "Error: " << importer->GetStatus().GetErrorString() << std::endl;
    importer->Destroy();
    manager->Destroy();
    return 1;
  }

  // Read the scene
  FbxScene* scene = FbxScene::Create(manager, "");
  importer->Import(scene);
  importer->Destroy();

  // Process the scene (potentially causing out-of-bounds write)
  processScene(scene);

  // Clean up
  scene->Destroy();
  manager->Destroy();

  return ;
}

The code above can potentially trigger the CVE-2023-27909 vulnerability, depending on how processScene function handles the crafted malicious FBX file.

Mitigation

To prevent the exploitation of the out-of-bounds write vulnerability, developers must update Autodesk® FBX® SDK to the latest patched version. The updated version contains fixes that address this vulnerability and ensure that the library handles manipulated input correctly.

Additionally, developers should ensure proper boundary checks and input validation while dealing with FBX files. Implementing secure coding practices will significantly reduce potential vulnerabilities that may be exploited by malicious actors.

Conclusion

The CVE-2023-27909 vulnerability within Autodesk® FBX® SDK 202 and prior versions highlights the importance of vigilant security measures while working with file formats and libraries. By understanding the vulnerability and applying appropriate mitigation techniques, developers can protect their applications from potential malicious exploits that leverage the out-of-bounds write vulnerability. Stay informed with the latest security updates and follow secure coding practices to ensure that your applications remain safe from any potential threats.

Timeline

Published on: 04/17/2023 21:15:00 UTC
Last modified on: 04/26/2023 23:05:00 UTC