Created
August 16, 2024 14:02
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| class IPv6Packet: | |
| def __init__(self, main_header_length, extension_headers): | |
| self.main_header_length = main_header_length | |
| self.extension_headers = extension_headers | |
| def process_packet(packet): | |
| total_length = packet.main_header_length | |
| # Vulnerable loop: doesn't check for integer underflow | |
| for header_length in packet.extension_headers: | |
| total_length += header_length | |
| # Simulating a buffer to hold packet data | |
| buffer = bytearray(64) # Only 64 bytes allocated | |
| # Vulnerable write: uses unchecked total_length | |
| for i in range(total_length): | |
| buffer[i] = 0xFF # Potential out-of-bounds write | |
| return buffer | |
| # Normal packet | |
| normal_packet = IPv6Packet(40, [8, 16]) | |
| result = process_packet(normal_packet) | |
| print("Normal packet processed, buffer length:", len(result)) | |
| # Malicious packet causing integer underflow | |
| malicious_packet = IPv6Packet(40, [8, 2**32 - 47]) # Very large number | |
| try: | |
| result = process_packet(malicious_packet) | |
| print("Malicious packet processed, buffer length:", len(result)) | |
| except IndexError as e: | |
| print("Crash occurred:", str(e)) |
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