The Data
This is a writeup of the network challenge The data from the Security Valley CTF
Level: 1, Score: 5
Premise
There is pcapng file. Can you, again, reveal the flag ?
Link: https://github.com/SecurityValley/PublicCTFChallenges/tree/master/network/the_data
Challenge files:
the_data.pcapng
Observations
We open the file in wireshark and see a HTTP request with the following as its content:
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GET /flag.png HTTP/1.1
Host: 192.168.56.1:8000
User-Agent: Wget/1.21.2
Accept: */*
Accept-Encoding: identity
Connection: Keep-Alive
The response to this is a 200 OK, followed by a data stream that starts with a PNG header.
Solution
We can follow the TCP stream, change the encoding format to raw, and take the data that begins with 89504e470d0a1a0a (as this is a PNG header), all the way to the last byte.
We now want to convert this raw data to a file, and this can be done with a simpler python script containing the following:
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hex_data = """89504e470d0a1a0a0000000d4948445200000780000004380806000000e8d3c14300000184694343504943432070726f66696c65000028917d913d48c35014854f5b4529150733883864689d2c888a3a6a158a5021d40aad3a98bcf4
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00000000260430000000000000c08400060000000000009810c00000000000000013021800000000000060226f3a51be721853550000000049454e44ae426082"""
hex_data = hex_data.replace('\n', '').replace('\r', '')
binary_data = bytes.fromhex(hex_data)
with open("flag.png", "wb") as file:
file.write(binary_data)
This creates a file named flag.png, which allows us to view the png image.
When we do, we can read our flag.
Tools used:
- wireshark
- python3
- an image viewer
This post is licensed under CC BY 4.0 by the author.