CVE-2025-14303: MSI主板IOMMU未正确启用导致内存读写漏洞

#!/usr/bin/env python3 """ CVE-2025-14303 PoC - DMA Memory Access via Insecure IOMMU Note: This is a conceptual PoC for educational purposes only. Requires physical access and DMA-capable hardware. """ import os import sys import struct def check_iommu_status(): """Check if IOMMU is enabled in the system""" try: with open('/sys/kernel/debug/vfio/iommu', 'r') as f: content = f.read() if 'IOMMU not enabled' in content or not content.strip(): return False return True except: # Alternative check via dmesg try: dmesg = os.popen('dmesg | grep -i iommu').read() return 'IOMMU enabled' in dmesg or 'AMD-Vi' in dmesg or 'Intel VT-d' in dmesg except: return None def dma_read_memory(address, length): """ Simulate DMA read operation (requires DMA-capable device) In real attack, this would use PCIe device with DMA capability """ print(f"[*] Attempting DMA read at physical address: 0x{address:016x}") print(f"[*] Reading {length} bytes...") # In actual implementation, this would: # 1. Use PCIe device with DMA capability # 2. Configure device to perform bus master DMA # 3. Read data from physical memory directly # This typically requires custom hardware/firmware or tools like pcileech return None def scan_physical_memory(): """ Scan physical memory for sensitive data Looking for: encryption keys, passwords, boot sectors """ print("[*] Scanning physical memory for sensitive data...") # Known memory regions to check: # - 0x00000000-0x00010000: IVT (Interrupt Vector Table) # - BIOS/UEFI region: typically 0xE0000-0xFFFFF # - ACPI tables: varies by system # - Kernel memory: typically starts at 0x100000 regions = [ (0x0, 0x10000, "Low memory / IVT"), (0x100000, 0x400000, "Early kernel memory"), ] for start, end, name in regions: print(f"[*] Checking {name}: 0x{start:08x}-0x{end:08x}") # In real attack, perform actual DMA reads here # Check for patterns indicating sensitive data pass def main(): print("="*60) print("CVE-2025-14303 - MSI IOMMU Bypass PoC") print("="*60) if os.geteuid() != 0: print("[!] This PoC requires root privileges") sys.exit(1) print("\n[*] Checking IOMMU status...") iommu_enabled = check_iommu_status() if iommu_enabled: print("[+] IOMMU is enabled - system may be protected") print("[*] However, IOMMU misconfiguration could still exist") elif iommu_enabled is False: print("[-] IOMMU is NOT enabled - vulnerable to CVE-2025-14303") print("[*] DMA-capable devices can access arbitrary physical memory") else: print("[?] Could not determine IOMMU status") print("\n[*] Note: Actual exploitation requires:") print(" - Physical access to target system") print(" - DMA-capable PCIe device (e.g., PCIe debug card, Thunderbolt device)") print(" - Tools like pcileech, Inception, or custom DMA firmware") print(" - Attack must occur before OS kernel security features load") if __name__ == "__main__": main()