https://quanvo0112.github.io/A random blog about programming, technology, and life. 2026-04-01T22:15:38+07:00 K1llV https://quanvo0112.github.io/ Jekyll © 2026 K1llV /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2026-03-31T09:00:00+07:00 2026-03-31T09:00:00+07:00 https://quanvo0112.github.io/posts/texsaw-writeup/ K1llV

OSINT Summer Trip Mô tả: Ohno, I took a photo of a poster on a trip and, I can not remember where I took it. Please help me find the coordinates. The only things I remember was there was a yellow money exchange machine and a popular roast beef restraunt. Flag format: texsaw{coordinates here} For example the cordinates for the plinth at UTD are 32°59’14.26”N 96°44’53.87”W Used google Eart...

2026-03-14T09:00:00+07:00 2026-04-01T22:14:58+07:00 https://quanvo0112.github.io/posts/upctf-writeup/ K1llV

Webs 0day on ipaddress Tác giả: Mô tả: whaaaaaaaaat Attachments: 0day-ip.zip Cách giải: Kiểm tra mã nguồn server.py, ta thấy ứng dụng nhận đầu vào là một địa chỉ IP và tiến hành validate thông qua thư viện ipaddress: try: ipaddress.ip_address(ip) except ValueError: return jsonify({"error": "Invalid IP address"}), 400 Tuy nhiên, với phiên bản Python 3.9 (được cấu hình...

2026-03-01T09:00:00+07:00 2026-03-27T11:24:21+07:00 https://quanvo0112.github.io/posts/uvtctf-writeup/ K1llV

Stegano Stellar Frequencies Mô tả: A layered audio transmission masks a space message within a thin, high‑frequency band, buried under a carrier. With the right tuning, the faint signal resolves into a drifting cipher beyond the audible, like a relay echoing from deep space. Ready to hunt the signal and decode what’s hiding between the bands? Attachment: frequencies.wav Cách giải: ...

2026-02-24T09:00:00+07:00 2026-03-27T11:24:21+07:00 https://quanvo0112.github.io/posts/bkctf-writeup/ K1llV

Misc Read the rules Tác giả: BatmansKitchen Mô tả: Join the discord and read the rules Flag: bkctf{1_r34d_th3_ru13z_4nd_1t_w4s_gr34t} Speedrunning Tác giả: Jono Mô tả: I speedran minecraft but MCSR didn’t accept my run :( Attachments: challenge.zip Cách giải: Khi vào thế giới /tp 0 ~ 0 tới đảo chính The End Vào cổng The End trở về thế giới Overworld, rồi đi ngư...

2026-02-23T09:00:00+07:00 2026-03-27T11:24:21+07:00 https://quanvo0112.github.io/posts/bitsctf-writeup/ K1llV

Misc Wifies_Lover # 1 Tác giả: kekwman Mô tả: The old capital is silent. Concrete skeletons stretch into the sky where surveillance towers once stood. The Government called it stability. The people called it control. Somewhere in the wreckage, the Resistance has rebuilt. Not openly. Not recklessly. You have received an image. The image is not decoration. It is not scenery. It is not ran...