ptr-yudai @ptrYudai Twitter profile

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ptr-yudai

@ptrYudai

2 years

I've released a beta version of #pawnyable , a website to learn advanced binary exploitation🐺🐱🐰🐼 Currently only the Linux Kernel chapter is about 90% complete😖 Other chapters and multilingual support are TODO😇

PAWNYABLE!

もふもふpwnワールド

pawnyable.cafe

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@ptrYudai

3 years

I played Hayyim CTF because the organizers looked promising. There was a nice challenge to exploit a patched anti-virus and here's my write-up for it.

Writing Anti-Anti-Virus Exploit (AuViel - Hayyim CTF 2022) - CTFするぞ

Introduction I played Hayyim CTF 2022 with keymoon, st98, and theoremoon. We solved all pwn tasks there and stood the 3rd place. *1 There was a pwn challenge to…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

It's very late but I've just finished writing my write-up of "Full Chain" from Google CTF 2021 Quals🍣

From JavaScript to Kernel - Google CTF 2021 Quals "Full Chain" Writeup - CTFするぞ

I played Google CTF 2021 Quals in zer0pts and I worked on several tasks. In the 6 pwnable challenges I solved during the CTF I liked "Full Chain" the most. This…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

Here is how I used 1-day vulnerability for the sandboxed chromium to solve XSS challenges in PlaidCTF. Thanks all the team members, especially @po6ix and @ar9ang3 for the base idea and the web part.

Information Leak via Compromised Sandboxed Browser - CTFするぞ

This article covers the exploit part. Check this one written by s1r1us for the web and chromium-security part. I solved some pwnable tasks from PlaidCTF 2021. T…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

8 months

I wrote 70 CTF challenges this year, which is my personal record🫠

ptr-challenge-list - HackMD

List of CTFs I got involved with, and challenges I have written.

hackmd.io

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ptr-yudai

@ptrYudai

6 years

Googleの検索結果から侍エンジニア塾を削除するユーザースクリプトです🍣

Greasemonkeyで検索結果のフィルタリング - CTFするぞ

Googleの検索結果に役に立たない情報が多いので，不要な結果を除外するためのGreasemonkeyスクリプトを作りました．ご自由にお使いください． blacklistに除外したいキーワードを配列で指定すると，そのキーワードを含むサイトは破棄されます． // ==UserScript== // @name goog…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

My write-ups for Pwn2Win CTF 2021🍣

Pwn2Win CTF 2021 Writeup - CTFするぞ

I played Pwn2Win CTF 2021 in uuunderflow and got the 2nd place. Unfortunately(?) we couldn't get the 1st place thanks to the flag hoarding but the CTF itself wa…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

DEF CON GTF 2022 Writeup

Guess The Flag: Writeup of router-nii from DEF CON CTF 2022 Quals - CTFするぞ

I played DEF CON CTF 2022 Quals in ./V /home/r/.bin/tw (my company colleagues and friends) and we got 7th place. With the great help of the great members, I cou…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

Kernel Exploitほげ

Kernel Exploitで使える構造体集 - CTFするぞ

はじめに Kernel Exploitを勉強し初めて2ヶ月ほどが経ちました。やっていて思うのは、カーネルランドのUAFやヒープオーバーフローなどは非常に強力だということです。しかし、脆弱なドライバが提供する機能以外に、カーネルや他のドライバが提供する機能を利用することが多いので、多くの知識が無いと上手く攻撃できなか…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

9 months

My writeup for kEASY in m0leCon CTF 2023 Finals🍣 Big applause to the authors for this nice challenge!👏

Understanding Dirty Pagetable - m0leCon Finals 2023 CTF Writeup - CTFするぞ

About I participated m0leCon Finals 2023 CTF, which was held in Politecnico di Torino, Italy, as a member of std::weak_ptr*1. Among the pwnable challenges…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

Thank you for playing zer0pts CTF! 🐤 I wrote GitFile Explorer, Anti-Fermat, service, dreamland, q-solved, miniblog++, miniblog#, MathHash, 0AV, accountant, MemSafeD, sbxnote, kvstore, kRCE, redis-lite and wrote the server of Zer0TP.

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ptr-yudai

@ptrYudai

3 years

It was the hardest weekend. I played 5 CTFs in 2 days and solved 22 pwnable tasks😫 Especially I liked - sushi-da3 from TSG LIVE! 6 CTF - klibrary from 3kCTF 2021 - puncher from m0leCon CTF 2021

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ptr-yudai

@ptrYudai

3 years

Result: I wrote 68 CTF tasks this year✏️

ptr-challenge-list - HackMD

List of CTFs I got involved with, and challenges I have written.

hackmd.io

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ptr-yudai

@ptrYudai

1 year

I've just published my writeups for zer0pts CTF 2023. Thank you for playing the CTF. #zer0ptsCTF

zer0pts CTF 2023 Writeup - CTFするぞ

Introduction This article is my writeups for zer0pts CTF 2023. Thank you for playing! Final Scoreboard Introduction pwn aush Background Challenge Solution qjail…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

🍰CakeCTF 2022 this weekend!🍰 We design this CTF to be neither too hard nor too easy, yet there's something to learn.

CakeCTF 2022

2022-09-03 14:00:00 +09:00 – 2022-09-04 14:00:00 +09:00

2022.cakectf.com

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ptr-yudai

@ptrYudai

3 years

I'm working for @RicercaSec from today!

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ptr-yudai

@ptrYudai

5 years

3ヶ月間頑張ったらそれなりに解けるようになりました。あと半年でもっと難しい問題も解けるようになりたいです🍣

2019年のpwn問を全部解くチャレンジ【前半戦】 - CTFするぞ

後半戦： 2019年のpwn問を全部解くチャレンジ【後半戦】 - CTFするぞまえがき (2019年3月記) 最近CTFに出るとそこそこ良い成績が残せる一方，チームのpwn担当として実力不足を感じています．そこで，pwn苦手意識を克服すべく本日2019年3月13日から，2019年1月1日から2019年12月31日ま…

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ptr-yudai

@ptrYudai

2 years

My write-ups for corCTF 2022🍣 I hope I can take more time for this CTF next year.

corCTF 2022 Writeups - CTFするぞ

I played corCTF 2022 in zer0pts. Actually I wasn't planning to play the CTF as I was busy that weekend. However, I saw st98-san solve some Web tasks and it look…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

My write-ups for Amazing ROP, JHeap, TODO List, Pwnception and Blacklist from pbctf 2020 🍣

pbctf 2020 Writeup - CTFするぞ

pbctf 2020 had been held from December 5th 00:00 UTC for 48 hours. I played it in zer0pts and we won the CTF🎉 I mainly worked on the pwn tasks. Every pwn task w…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

I wrote 4 pwn and 1 rev in ASIS CTF 2021 Quals. I hope you enjoyed them🥺

ASIS CTF 2021 Quals Pwn Writeup - CTFするぞ

I wrote 4 pwn and 1 rev tasks for ASIS CTF 2021 Quals. This article covers the brief writeups of the tasks I made. I'm very looking forward to reading your writ…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

I wrote the pwn tasks of #ASIS CTF 2020 Quals. Here's my writeup.

ASIS CTF 2020 Quals - Pwn Writeup - CTFするぞ

I wrote the 6 pwn tasks of ASIS CTF 2020 Quals. Here is the brief overview of them. Challenge Vulnerability Estimated Difficulty Full Protection stack overflow,…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

Writeups for my Jeopardy challenges in #SECCON CTF 2022 Finals🍣

Jeopardy Writeups - SECCON CTF 2022 Finals - CTFするぞ

I supported the organization of SECCON CTF 2022 Finals on February 11th and 12th in Asakusabashi, Tokyo. This is the write-ups for the Jeopardy challenges I cre…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

Thank you for playing zer0pts CTF 2021! I wrote Not Beginner's Stack, stopwatch, OneShot, safe vector, gorypt, nasm kit, GuestFS:RCE, GuestFS:AFR, Baby SQLi, infected, syscall 777, Not Beginner's Rev, spotlight, signme, and Tokyo Network.

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ptr-yudai

@ptrYudai

4 years

My writeups for FireShell CTF 2020 🍣 It was my first webkit pwn and spent 16 hours on the single challenge, mostly because of gigacage + randomized structure id. Thank you @FireShellST for the nice pwn tasks!

FireShell CTF 2020 Writeups - CTFするぞ

FireShell CTF had been held from March 22th JST for 24 hours. I played this CTF in zer0pts and we reached 3rd place. I solved only two pwn tasks and one easy cr…

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@ptrYudai

10 months

My writeups of #TSG_CTF 2023🍣

TSG CTF 2023 Writeup - CTFするぞ

I played TSG CTF 2023 in zer0pts and stood 4th place. Everyone loves TSG CTF. Writeups from st98: nanimokangaeteinai.hateblo.jp [Pwn beginner-easy] converter (7…

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@ptrYudai

2 years

DEFCON Village was a lot of fun! DEFCON CTF was......

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ptr-yudai

@ptrYudai

8 months

#MAPNA CTF writeups🍣

MapnaCTF 2024 Writeup - CTFするぞ

I participated in MapnaCTF, which is a CTF event sponsored by Mapna group and hosted by ASIS team. I played it as a member of BunkyoWesterns *1 and stood 1st pl…

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ptr-yudai

@ptrYudai

4 years

it was a bit hard to restore😉

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ptr-yudai

@ptrYudai

2 years

I found a small technique to abuse template engine with prototype pollution and made a task in CakeCTF 2022. (Since I'm not familiar with web, I don't know if it's even new or useful.)

Polluting Template Engine Cache via Prototype Pollution - CTFするぞ

Yesterday I hosted CakeCTF 2022 and I wrote a web task named "Panda Memo" in the CTF. I invented (or re-invented?) a small technique to abuse prototype pollutio…

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ptr-yudai

@ptrYudai

1 year

I played Midnight Sun CTF Finals in TokyoWesterns. Thank you for the fantastiska CTF ♥️🇸🇪

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ptr-yudai

@ptrYudai

3 years

there were tons of things to learn when i started ctfs but recently i feel most of them boring. most of "hard" tasks are just time-consuming, not interesting, nothing to learn. i'll refrain from playing ctfs as a pwner next year, bye.

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ptr-yudai

@ptrYudai

5 years

GCC通ったので課題晒します

GCC Tokyo(Global Cybersecurity Camp v2.0) 応募課題晒し - CTFするぞ

去年に続き今年もGCCが開催されるそうです。去年は卒論で教員に圧力をかけられ参加できませんでしたが、今年は卒論も無いので応募することにしました。 GCCの応募には応募課題をする必要があるのですが、この記事ではその課題に対する私の回答を晒します。やってみた感想としては、出された3つの課題はどれも勉強になって面白かった…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

I spent my entire birthday playing the CTF😭 Still the payoff was worth it🙂

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ptr-yudai

@ptrYudai

4 years

WebKitです🤮

WebKit Exploitに対する防御機構と回避法 - CTFするぞ

はじめに少し前のFireShell CTFでwebkitのexploitを書いたのですが、一部作問ミスを利用して解いたのでexploitを書き直しました。その際、webkitのセキュリティ機構を2つ回避する必要があったので、それらの回避法について調べました。この辺は日本語記事が皆無なのでまとめようと思います。 G…

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ptr-yudai

@ptrYudai

1 year

i played google ctf in kijitora and i solved write-flag-where 1/2/3, ubf, gradebook, fastbox, lightbox, symatrix, turtle, png2. one team unexpectedly hoarded flags and we lost the ticket to tokyo, but realized we're already in tokyo.

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ptr-yudai

@ptrYudai

2 years

My writeups for Hack[.]lu CTF🍣

Hack.lu CTF 2022 Writeups - CTFするぞ

I met @keymoon at CODEBLUE conference and impulsively decided to play a CTF with him. There was Hack.lu CTF 2022 in that weekend and we played it as a team weak…

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ptr-yudai

@ptrYudai

5 years

My writeup for Facebook CTF 2019 🍣 Thank you for the fun CTF #fbctf

Facebook CTF 2019 Writeup - CTFするぞ

Facebook CTF 2019 had been held from June 1st 00:00 UTC to June 2nd 00:00 UTC. I played this CTF as a member of zer0pts. We got 9372pts and reached 18th place. …

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ptr-yudai

@ptrYudai

4 years

Thank you @HypwnLab for the nice T-shirt😆

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@ptrYudai

4 years

Thank you for playing #SECCON CTF 2020. I wrote pwarmup, lazynote, kstac, encryptor, SCSBX:Reversing and SCSBX:Escape. I hope you enjoyed them😀

SECCON 2020 Online CTF Writeup - CTFするぞ

I wrote some challenges for this year's SECCON CTF. SECCON was famous for providing some crappy challenges but they eliminated those crappy-challenge authors th…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

何かExploit手法を思いついたので書きました。既出だったらこっそり教えてください......

House of Husk (仮) - CTFするぞ

はじめにヒープ大嫌いなのですが、多分まだ誰も公開していないヒープ系exploit手法を思いついたので書きます。調べても出てこなかったので既出じゃないと信じて「House of Husk」と名前を付けました。これ系に命名規則があるのか不明だし名前も思いつかないのでさっき見ていたアニメのキャラクターから取りました。 …

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ptr-yudai

@ptrYudai

10 months

I'm at Blackhat MEA as a challenge author 🎩 Good luck everyone!

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ptr-yudai

@ptrYudai

3 years

I don't know why but we're going to host another CTF this year 👀

DUNGEON - BSides Ahmedabad CTF 2021

ctftime.org

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ptr-yudai

@ptrYudai

5 years

きょうは、わくわくプログラミングコンテストでかちました

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ptr-yudai

@ptrYudai

2 years

SecLang was the most time-consuming challenge to create in my CTF life. I had to design a new language, write an interpreter and compiler for it, make a good scoring system that no one can "cheat", adjust bugs and difficulty, and benchmark the system 😵

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ptr-yudai

@ptrYudai

9 months

I created bomberman, babyheap 1970, elk, ReMOV, efsbk, call, landbox, and the concept of digicake for #SECCON CTF 2023 Finals🎄 Thank you for your participation!

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ptr-yudai

@ptrYudai

2 years

I feel the energy of USA

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ptr-yudai

@ptrYudai

4 years

お疲れさまでした！私は Reversing: yakisoba / ghost / sneaky Pwn: Beginner's Stack / Beginner's Heap / Elementary Stack Misc: readme を作問しました。 #ctf4b

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@ptrYudai

10 months

I'll be hosting CakeCTF 2023 tomorrow, which is a casual CTF for beginners and intermediates🍰

CakeCTF 2023

2023-11-11 14:00:00 +09:00 – 2023-11-12 14:00:00 +09:00

2023.cakectf.com

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ptr-yudai

@ptrYudai

5 years

わーい #netwars

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ptr-yudai

@ptrYudai

5 years

公開されてしばらく経つHouse of Corrosionですが、知名度が低いので解説を書きました

House of Corrosionの解説 - CTFするぞ

はじめに 2019年に入ってからHouse of Corrosionというヒープ系exploitテクニックが公開されたのですが、全然文献が無いのでまとめようと思います。結構使えると思うし元記事の考察もよく書かれているので個人的に好きな手法です。ただ、説明が並んでいるだけでPoCとかは無さそうなので、実例を挙げつつ紹…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

I played PlaidCTF 2021 in uuunderflow and surprisingly I (with the help of web professionals) got 1st and only one blood for a web task. Maybe I'll post how I pwned the sandboxed chrome crawler to leak the flag😉 Sorry for the unintended solution.

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ptr-yudai

@ptrYudai

5 years

ハードウェア問が面白かったです。 #seccon

SECCON CTF 2019 FinalのWriteup - CTFするぞ

2019年もSECCONが秋葉原で開催されました。今回はNaruseJunで国際決勝に参加し、最終的には4323点を獲得して1位でした。 SECCONについて国内チームも参加しやすい敷居の低い競技を毎年開催していただき感謝です。ただ年々セキュリティコンテストからプログラミングコンテストへ移行している気がします。 …

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ptr-yudai

@ptrYudai

4 years

作った問題のWriteup+flip,childheapのexploitです🍣 #seccon #ctf4b

SECCON Beginners CTF 2020 作問者Writeup - CTFするぞ

はじめに 5月23日14:00から24時間、初心者向けのSECCON Beginners CTF 2020を開催しました。といっても全問が初心者向けな訳ではなく、中級者でも難しいと感じるような問題もちらほらあったと思います。また、CTFを本当に初めて触るという方にとってはBeginnerタグの付いた問題だけでも難し…

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ptr-yudai

@ptrYudai

5 years

チュータ落ちた人がseccamp落ちた人にangrとかマルウェア解析を教えるyoshi-campを阪大でやってます

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ptr-yudai

@ptrYudai

3 years

Again, we got only 1 solve for an XSS challenge by 1-day exploit in S4CTF😋 This time, I had to steal the cookie from the other domain and it was a really hard work...... but I learned a lot💪 Thank you @S1r1u5_ for working on the XSS part!

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ptr-yudai

@ptrYudai

3 years

I made my first XSS challenge in CakeCTF and some lessons learned. - Put flag in cookie, not in UA - Change domain for every XSS challenge - reCAPTCHA can drop unintended solution - XSS challenge is quite hard to make without unintended solution Respect to web CTFers🥺

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ptr-yudai

@ptrYudai

4 years

たぶん22か23歳になりました🎂

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@ptrYudai

4 years

My writeup for WMCTF 2020🍣 It was my first time to pwn golang-made binary and golang-made php extension on apache😆

WMCTF 2020 Writeup - CTFするぞ

I played WMCTF 2020 in DefenitelyZer0 (Defenit x zer0pts) and reached 8th place! WMCTF had been held from August 1st for 48 hours on XCTF platform. (I call it C…

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@ptrYudai

3 years

I, @theoremoon , and @y05h1k1ng are going to host CakeCTF (previously named InterKosenCTF) on August 28-29th. It aims to be a high quality CTF for intermediate and beginner CTFers. More information is coming soon.

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ptr-yudai

@ptrYudai

3 years

today: inc byte [rel age] jo die ret

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ptr-yudai

@ptrYudai

3 years

Thank you for playing SECCON 2021! I wrote [misc] hitchhike [pwn] kasu bof, gosu bof, pyast64++.pwn, kone_gadget [rev] corrupted flag, pyast64++.rev, <flag> I hope you like them😋 Congratz to Super Guesser, organizer, Balsn, and (o^_^o)!!!

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@ptrYudai

4 years

We won pbctf 2020🥳 The tasks are really hard and we learned a lot! Thank you @pb_ctf for hosting the amazing CTF!

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@ptrYudai

4 years

We played TWCTF in D0G$ got 1st place! I enjoyed the great pwn challenges.

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@ptrYudai

10 months

Thank you everyone at Blackhat MEA, especially those who tried my challenges!

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@ptrYudai

3 years

pwnable task tendency by country ch, us: heap note pwn jp, kr: puzzle pwn eu, ru: rev pwn

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@ptrYudai

3 years

Thank you for playing BSides AHM 2021! I wrote the following tasks: [pwn] BabyBOF:RCE, BabyBOF:SBX, httpsaba, padnote, shared knopte [rev] intersection, King's License, Collapsed License, catflap [cry] dlppp, floorsa [web] entrance, (pwn part of) neutron [mis] qunknown

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ptr-yudai

@ptrYudai

3 years

12th place in 0CTF🎉🤮 I solved uc_master, uc_good, ListBook, BabyHeap 2021, how2mutate, and FA51R_RE with @x0r19x91

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ptr-yudai

@ptrYudai

4 years

2nd place on GoogleCTF Final🥈 Thank you for the amazing competition!

Gynvael Coldwind

@gynvael

4 years

The final match of Hackceler8 (GoogleCTF Final Event) is now over! 1st + $3k. PPP ( @PlaidCTF ) 2nd + $2k. I Use Bing 3rd + $1k. pasten ( @pastenctf ) 4th + $500. TFNS ( @FlatNetworkOrg ) Congratz! Our experimental speed-hacking competition is now over. Videos soon! GG :)

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@ptrYudai

4 years

I wrote 3 pwn tasks (refcnt, babyauth, minilang++) for ASIS CTF 2020 Finals🤗 I hope you enjoyed them🥺

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ptr-yudai

@ptrYudai

4 years

My writeup of TSG CTF 2020🍣 It was an amazing collab with team @Defenit1 ⚔️

TSG CTF 2020 Writeup - CTFするぞ

TSG CTF 2020 had been held from July 11th 07:00 UTC for 24 hours. I played it in DefenitelyZer0, a collabolation team of Defenit and zer0pts, and reached 2nd pl…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

The cake is not a lie 🍰 It's coming this weekend!

CakeCTF 2021

2021-08-28 08:00:00 +09:00 – 2021-08-29 20:00:00 +09:0

2021.cakectf.com

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ptr-yudai

@ptrYudai

4 years

CTFtimeの扱いが難しかったです #zer0ptsCTF

zer0pts CTF 2020 開催記 - CTFするぞ

はじめに 2020年03月07日00:00から09日00:00 UTCにzer0pts CTF 2020を開催しました。今回はいままでと違い、zer0ptsで開催したという点と、CTFtimeに載せたという点で初だったので緊張感がありました。開催記を残すとともに、CTFtimeに載せる手順や攻撃への対応なども書くの…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

weekdays to work, weekends to play ctfs, no time for writeups😭

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ptr-yudai

@ptrYudai

2 years

첫 한국여행🇰🇷

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ptr-yudai

@ptrYudai

2 years

never expected someone to solve the hardest pwn challenge from smartphone🤣

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ptr-yudai

@ptrYudai

3 years

My write-ups for 0CTF/TCTF Quals 2021🍣

0CTF/TCTF Quals 2021 Writeups - CTFするぞ

What is heap? I don't know. Anyways I guess we're qualified to the Finals. I want to play it if I can play it onsite. Please open the border as soon as possible…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

My writeups for Plaid CTF 2020🍣

PlaidCTF 2020 Writeups - CTFするぞ

I played PlaidCTF in shibad0gs and reached 38th place. I'm going to write up the challenges I solved during the CTF. I don't write about "YOU wa SHOCKWAVE" as I…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

ctf duration and me <24h:😊 24h:🙂 36h:😐 48h:🙁 >48h:😩🤢🤮😇🪦

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ptr-yudai

@ptrYudai

5 years

軽くですが #SECCON のwriteupです🍣

SECCON Online 2019 QualsのWriteup - CTFするぞ

SECCON Online 2019 Qualificationが10月19日の15:00(JST)から24時間開催されました。今年はNaruseJunで参加し、全体で5位でした。 1時間程度しか寝ていないので疲れましたが、オンサイトでわいわい解くのは楽しかったです。通したフラグは合計で1736点でした。手伝った問…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

5 years

PoC書きました #みんなでサイバーセキュリティ

Gomium BrowserのWriteup【Google CTF 2019 Finals】 - CTFするぞ

はじめに今日サイバーセキュリティ系LT会というのに参加したのですが、そこでhamaさんが発表されていたgoの処理系がunsafeな話が面白かったので、解説されていた問題を解こうと思います。内容はgoには標準でdata raceが存在し、任意のgoコードが実行出来る場合は（importが限られていても）シェルを取れま…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

HEAVY RAIN

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ptr-yudai

@ptrYudai

2 years

I wrote the following tasks for #SECCON CTF 2022 Finals: diagemu, babyescape, Dusty Storage, Conversation Starter, Whisky, Paper House, Check in Abyss, a physical device challenge (Sniffer 1/2), and 2 KoH: SecLang and Heptarchy

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ptr-yudai

@ptrYudai

5 years

TokyoWesterns CTF 5th 2019のwriteup🍣 簡単なpwnを潰す担当のつもりがreversingの人になってしまった。なんかpwn向いてない気がする。 #TWCTF

TokyoWesterns CTF 5th 2019 Writeup - CTFするぞ

TokyoWesterns CTF 5th 2019が日本時間で8/31 09:00から9/02 09:00まで開催されました。私はチームHarekazeとして参加し、Harekazeは1481点を獲得して33位でした。そのうち5問を私は解いたので、そのwriteupを書こうと思います。 [Pwn 78pts] n…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

My writeup for Defenit CTF 2020🍣 On solving Error Program I found a useful way to pwn _IO_list_all by overwriting dealloc_buffers! Thank you for the nice tasks🤗

Defenit CTF 2020 Writeups - CTFするぞ

We zer0pts played Defenit CTF 2020 and reached 4th place! It was a really amazing CTF! Other members' writeups: furutsuki.hatenablog.com st98.github.io Here is …

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

met the great security researcher @orange_8361 at codeblue conference🙏

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ptr-yudai

@ptrYudai

4 years

供養

0CTF/TCTF 2020 Quals - Chromium RCE

0CTF/TCTF 2020 Quals - Chromium RCE. GitHub Gist: instantly share code, notes, and snippets.

gist.github.com

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ptr-yudai

@ptrYudai

5 years

#SECCON Beginners CTF 2019のpwnのwriteupです。 #ctf4b

SECCON Beginners CTF 2019のWriteup - CTFするぞ

5月25日(土)15:00から24時間開催されたSECCON Beginners CTF 2019にzer0ptsのメンバーで参加しました。大会の存在をすっかり忘れていたので途中から参加しましたが、担当分野は無事全部解くことができました。初心者向けながら典型とは外れたものもあり、勉強になる問題が多いと思います。解…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

pwn tasks should be open-sourced

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ptr-yudai

@ptrYudai

9 months

Demo badge at reception counter got hacked by mercari 🔥 #SECCON

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ptr-yudai

@ptrYudai

5 years

A week has passed and it's allowed to share writeups now. My writeups for Newbie CTF 2019🍣

Newbie CTF 2019 Writeup - CTFするぞ

I played Newbie CTF which was held from November 2nd to 3rd in zer0pts. The CTF had some problems in their challenges, servers, and so on but I enjoyed it. We g…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

2 years

Google CTF pwn/sandbox were like "Do you know much about our products?"

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ptr-yudai

@ptrYudai

3 years

The last CTF this year; pwn tasks were very good (open-sourced, most importantly!) Thanks authors👏

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ptr-yudai

@ptrYudai

5 years

Contrail CTFのwriteup🍣

Contrail CTF 2019のWriteup - CTFするぞ

Contrail CTFが12月30日から1月4日まで開催され、zer0ptsで参加しました。全体で4786点を獲得して1位でした。解いた問題のwriteupを簡単に書きます。 [pwn 100pts] welcomechain [pwn 304pts] instant_httpserver [pwn 356pts…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

4 years

I enjoyed HITCON CTF 2020 with GoN and Defenit🤗 I solved dual, atoms, telescope and helped teammates to pwn spark. After that, I'd been working on cgi but couldn't finish it because of `"]\x00` 😖

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ptr-yudai

@ptrYudai

4 years

BingoCTF was a brand new CTF! I made 1 bingo in 2h 20m and got 3rd place🥉 I could've win if I solved ISO😇

BingoCTF 2020 Writeup - CTFするぞ

BingoCTF took place from 12th Nov, 09:00 KST for 24 hours. This CTF is a new-style competition for individuals. The score is calculated based on the number of b…

ptr-yudai.hatenablog.com

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ptr-yudai

@ptrYudai

3 years

is rkm0959 a robot or something?

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ptr-yudai

@ptrYudai

3 years

......WHAT?

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ptr-yudai

@ptrYudai

4 years

Happy New Year!🥳🍣🤗😆

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ptr-yudai

@ptrYudai

2 years

very nice to see many asian top ctf players

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ptr-yudai

@ptrYudai

4 years

It makes me lose my motivation when CTF admin - remove a challenge that is already solved for any reason - open hint for a challenge that is already solved for any reason That's extremely unfair.

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