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October 22, 2017 15:58
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Thailand CTF 2017 Write-up : Compression (150)
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| โจทย์ Compression.txt | |
| 3c | |
| 94 | |
| d5 | |
| 28 | |
| 17 | |
| f0 | |
| 00 | |
| 30 | |
| 48 | |
| 30 | |
| 44 | |
| 36 | |
| 86 | |
| dd | |
| 60 | |
| 00 | |
| 00 | |
| 00 | |
| 00 | |
| 28 | |
| 06 | |
| 40 | |
| 26 | |
| 20 | |
| 00 | |
| 00 | |
| 22 | |
| 50 | |
| 21 | |
| 15 | |
| 02 | |
| 30 | |
| 48 | |
| ff | |
| fe | |
| 30 | |
| 44 | |
| 36 | |
| 24 | |
| 00 | |
| cb | |
| 00 | |
| 20 | |
| 48 | |
| 00 | |
| 01 | |
| 00 | |
| 00 | |
| 00 | |
| 00 | |
| 68 | |
| 14 | |
| 00 | |
| 55 | |
| 99 | |
| 70 | |
| 00 | |
| 50 | |
| ae | |
| ed | |
| a1 | |
| 55 | |
| 00 | |
| 00 | |
| 00 | |
| 00 | |
| a0 | |
| 02 | |
| 16 | |
| 80 | |
| d6 | |
| 0d | |
| 00 | |
| 00 | |
| 02 | |
| 04 | |
| 05 | |
| a0 | |
| 04 | |
| 02 | |
| 08 | |
| 0a | |
| 02 | |
| 21 | |
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| 94 | |
| 00 | |
| 00 | |
| 00 | |
| 00 | |
| 01 | |
| 03 | |
| 03 | |
| 06 | |
| วิธีแก้ | |
| 1.) แปลง hex > binary form | |
| $ cat Compression.txt |tr -d ' '|tr -d '\n'|xxd -r -p > comp.bin | |
| 2.) ใช้ text2pcap แปลง binary เป็น pcap แต่ต้องใช้ format ของ hexdump เป็น input | |
| $ hexdump comp.bin > comp-hexdump.txt | |
| $ text2pcap comp-hexdump.txt comp-flag.pcap | |
| Input from: comp-hexdump.txt | |
| Output to: comp-flag.pcap | |
| Output format: PCAP | |
| Wrote packet of 94 bytes. | |
| Read 1 potential packet, wrote 1 packet (134 bytes). | |
| 3.) เปิด pcap ที่ได้จะเจอ TCP 1 packet ตอบ destination IPv6 เป็น flag (เดาเอา) | |
| เปิด pcap ด้วย Wireshark > เลือก packet > IPv6 section ข้างล่าง > Destination > คลิกขวา copy > Value | |
| Flag: 2400:cb00:2048:1::6814:55 |
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