Säkerhets-SM 2020 Challenge Solutions Part 1/3 Calle Svensson 2020-03-15 | March 13-15, the 2020 edition of the Swedish High-School CTF championships, "Säkerhets-SM", took place. The competition aims to bring high school students (and others) some nice security challenges and expose them to the fantastic world of CTFs.For more info and to participate: https://sakerhetssm.se/I will host a stream where I will go through the challenges from Säkerhets-SM 2020, how to approach them and how to solve them. Note that the competition is (at least partially) in Swedish but this stream will be in English.Contents:00:10 - IntroductionIntro challenges04:50 - Encoding 10111:25 - Remote 10113:45 - ELF 101Misc challenges20:00 - Discord23:20 - Hidden in Plain Sight30:30 - Vackra FilerWeb challenges39:25 - Perfecto Desk54:00 - The Colours and the Shapes01:05:30 - FlagdminReverse engineering challenges01:29:20 - Bit Snek01:44:20 - Diffcomp02:07:10 - Double Protection02:40:50 - Overly Attached OS03:33:40 - Zeta Cryptor PRO03:49:15 - OutroPart 1: youtube.com/watch?v=CYBGQ9Zp6UQPart 2: youtube.com/watch?v=mEeccIodvFQPart 3: youtube.com/watch?v=Od8QJwQpbkk
Speed reversing challenge by LarsH Calle Svensson 2022-09-22 | In this stream I will try to solve a reverse engineering challenge created by my friend LarsH which was originally used at the Midnight Sun speed-pwning tournament.Table of Contents:0:00:00 Intro0:03:47 Solving2:34:49 Solved
Blind solving the 2021 Gen Z Hack Challenge - Part 2 Calle Svensson 2022-05-25 | In this steam I will continue my attempts to solve some of the challenges of the 2021 edition of the "Gen Z Hack Challenge" (https://2021.challenge.fi). I will be joined by Aapo who will bounce tips and ideas with me.Table of contents:0:00:00 Intro0:03:08 Hack weblogin part 10:18:17 Hack weblogin part 20:49:13 Catch the criminal part 11:13:07 Catch the criminal part 21:25:29 Aapoweb1:39:56 Outro
Blind solving the 2021 Gen Z Hack Challenge Calle Svensson 2022-04-11 | In this steam I will attempt to solve some of the challenges of the 2021 edition of the "Gen Z Hack Challenge" (https://2021.challenge.fi). I will be joined by Aapo who will bounce tips and ideas with me.Table of contents:0:00:00 Intro0:06:14 Project Kyyber 10:16:39 Project Kyyber 2 & 31:24:29 Securelogin3:01:08 Enter the world of binary3:11:25 Deep inside ones and zeros3:16:00 Outro
Säkerhets-SM 2021 Challenge Solutions Part 2 Calle Svensson 2021-04-26 | March 26-28, the 2021 edition of the Swedish High-School CTF championships, "Säkerhets-SM", took place. The competition aims to bring high school students (and others) some nice security challenges and expose them to the fantastic world of CTFs.For more info and to participate: https://sakerhetssm.se/In this stream I go through the challenges from Säkerhets-SM 2021, how to approach them and how to solve them. Note that the competition is (at least partially) in Swedish but this stream will be in English.To try the challenges on your own, see: github.com/Kodsport/sakerhetssm-2021-solutionsContents: 0:00:00 Intro0:02:51 Web - Bästa Bloggen0:16:24 Web - XSS with Animations0:32:25 Web - myFirstPHPProject1:01:11 Web - The Secret Club1:04:21 Web - Undvik Handskakning1:08:16 Misc - Affisch1:42:19 Outro
Säkerhets-SM 2021 Challenge Solutions Part 1 Calle Svensson 2021-04-02 | March 26-28, the 2021 edition of the Swedish High-School CTF championships, "Säkerhets-SM", took place. The competition aims to bring high school students (and others) some nice security challenges and expose them to the fantastic world of CTFs.For more info and to participate: https://sakerhetssm.se/I will host a stream where I will go through the challenges from Säkerhets-SM 2021, how to approach them and how to solve them. Note that the competition is (at least partially) in Swedish but this stream will be in English.To try the challenges on your own, see: github.com/Kodsport/sakerhetssm-2021-solutionsContents:0:00:00 Intro0:15:48 Forensics0:16:22 Forensics - Datorer AB0:29:11 Forensics - PDF Padlock0:37:39 Forensics - Herr Robot0:50:09 Forensics - Skumt Ljud1:31:18 Forensics - Anamorfos1:45:25 Forensics - Mosad Bild2:09:26 Pwn - Buffertspill2:43:11 Pwn - Printf i en loop3:17:36 Reversing - Durins Dörrar3:20:47 Reversing - Isengård4:11:22 Reversing - Barad-Dur4:51:12 Reversing - Kodlås5:03:23 Reversing - Skum Kod5:30:30 Reversing - Outro
Blind solving the Nixu challenge - Part 2 Calle Svensson 2021-01-20 | In this series of streams I will attempt to solve some of the challenges of the "The Nixu Challenge" (thenixuchallenge.com/). In this part we take a look at:- Bad memories - part 1- Bad memories - part 3
Blind solving the Nixu challenge - Part 1 Calle Svensson 2021-01-13 | In this series of streams I will attempt to solve some of the challenges of the "The Nixu Challenge" (thenixuchallenge.com/). In this part we take a look at:- Device Control Pwnel- Device Control Pwnel - part 2- AIMLES - staging
Blind solving a crackme by s4tan - Part 3/3 Calle Svensson 2020-11-19 | In this video series I'm solving a so called "crackme" challenge posted by Antonio "s4tan" Parata (twitter.com/s4tan). I have not looked at the challenge before or between these streams. This is to show how I'm thinking when approaching a challenge like this and how I use the different tools involved. If you have any comments or questions about this or reverse engineering, please leave a comment and if you would like to see more streams like this, consider subscribing.Part 1 - youtube.com/watch?v=NJamb40GSYYPart 2 - youtube.com/watch?v=6y4tfVWH-qMPart 3 - youtube.com/watch?v=kuhu9VEASQI
Blind solving a crackme by s4tan - Part 2/3 Calle Svensson 2020-11-15 | In this video series I'm solving a so called "crackme" challenge posted by Antonio "s4tan" Parata (twitter.com/s4tan). I have not looked at the challenge before or between these streams. This is to show how I'm thinking when approaching a challenge like this and how I use the different tools involved. If you have any comments or questions about this or reverse engineering, please leave a comment and if you would like to see more streams like this, consider subscribing.Part 1 - youtube.com/watch?v=NJamb40GSYYPart 2 - youtube.com/watch?v=6y4tfVWH-qMPart 3 - youtube.com/watch?v=kuhu9VEASQI
Blind solving a crackme by s4tan - Part 1/3 Calle Svensson 2020-11-10 | In this video series I'm solving a so called "crackme" challenge posted by Antonio "s4tan" Parata (twitter.com/s4tan). I have not looked at the challenge before or between these streams. This is to show how I'm thinking when approaching a challenge like this and how I use the different tools involved. If you have any comments or questions about this or reverse engineering, please leave a comment and if you would like to see more streams like this, consider subscribing.Part 1 - youtube.com/watch?v=NJamb40GSYYPart 2 - youtube.com/watch?v=6y4tfVWH-qMPart 3 - youtube.com/watch?v=kuhu9VEASQI
How a not so random number broke the PS3 #MegaFavNumbers Calle Svensson 2020-09-01 | This video explains how Sony's flawed implementation of elliptic curve cryptography enabled hackers to gain control of the Playstation 3 and run their own software on it.This video is part of the MegaFavNumbers project. Maths YouTubers have come together to make videos about their favourite numbers bigger than one million, which is called #MegaFavNumbers.My links:Website: zeta-two.comTwitter: twitter.com/ZetaTwoPatreon: patreon.com/ZetaTwoCheck out other security creators at: securitycreators.videoIntro to ECC: https://andrea.corbellini.name/2015/05/17/elliptic-curve-cryptography-a-gentle-introduction/Script (including links to more sources): docs.google.com/document/d/1riSbs2LRCkK4RwSaMnTzRSDFjgWvQ4galxGvMmwxi2E/edit?usp=sharingImages used (Creative Commons):en.wikipedia.org/wiki/File:Private_key_signing.svgcommons.wikimedia.org/wiki/File:Silver_Playstation_3_icon.pngcommons.wikimedia.org/wiki/File:PS3-slim-console.pngen.wikipedia.org/wiki/File:George_Hotz_at_TechCrunch_Disrupt.jpgxkcd.com/221
Blind solving the Knowit Hack AB CTF - Part 2 Calle Svensson 2020-07-14 | Going to attempt a blind solve of the Knowit Hack AB CTF
Blind solving the Knowit Hack AB CTF Calle Svensson 2020-06-02 | Going to attempt a blind solve of the Knowit Hack AB CTF
Solving the Knowit AD Lab Calle Svensson 2020-05-30 | Going through the solution to the Knowit AD Lab CTF
Säkerhets-SM 2020 Challenge Solutions Part 3/3 Calle Svensson 2020-03-19 | March 13-15, the 2020 edition of the Swedish High-School CTF championships, "Säkerhets-SM", took place. The competition aims to bring high school students (and others) some nice security challenges and expose them to the fantastic world of CTFs.For more info and to participate: https://sakerhetssm.se/I will host a stream where I will go through the challenges from Säkerhets-SM 2020, how to approach them and how to solve them. Note that the competition is (at least partially) in Swedish but this stream will be in English.Contents:00:00 - IntroductionForensics challenges:02:15 - Korrumperad Katt06:30 - Beautiful Birds13:15 - Unzip me20:05 - Ett äpple om dagen01:20:25 - Torktumlad zipWeb challenges:01:41:20 - Dos protectionboot2root challenges:02:19:50 - Knowit 1 - Initial02:42:50 - Knowit 2 - User02:55:15 - Knowit 3 - RootCrypto challenges:03:09:50 - Konstig kloss03:18:45 - OutroPart 1: youtube.com/watch?v=CYBGQ9Zp6UQPart 2: youtube.com/watch?v=mEeccIodvFQPart 3: youtube.com/watch?v=Od8QJwQpbkk
Säkerhets-SM 2020 Challenge Solutions Part 2/3 Calle Svensson 2020-03-18 | March 13-15, the 2020 edition of the Swedish High-School CTF championships, "Säkerhets-SM", took place. The competition aims to bring high school students (and others) some nice security challenges and expose them to the fantastic world of CTFs.For more info and to participate: https://sakerhetssm.se/I will host a stream where I will go through the challenges from Säkerhets-SM 2020, how to approach them and how to solve them. Note that the competition is (at least partially) in Swedish but this stream will be in English.Contents:00:00 - IntroductionPwn challenges02:20 - Miniräknare07:40 - Hello, World40:10 - Echo service01:05:40 - NotebookCrypto challenges01:37:20 - Baby Crypto01:43:50 - Gömt Meddelande01:51:35 - Risigt Strukturerad Algebra01:59:45 - Kryptiska apkonster02:16:15 - Konstig kloss, part 102:32:20 - OutroPart 1: youtube.com/watch?v=CYBGQ9Zp6UQPart 2: youtube.com/watch?v=mEeccIodvFQPart 3: youtube.com/watch?v=Od8QJwQpbkk
Pwny Racing - Episode 11 Calle Svensson 2019-12-28 | Commentators: Zeta Two & LarsHChallenge author: LarsHParticipants: PewZ, nsr, niklasb and phLaulWinner: niklasbEpisode info and challenge download: https://pwny.racing/episodes/episode11/
Pwny Racing - Episode 10 Calle Svensson 2019-11-30 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: Peace-Maker, NotDeGhost, night_f0x & spqWinner: night_f0xEpisode info and challenge download: https://pwny.racing/episodes/episode10/
Pwny Racing - CSAW Special Calle Svensson 2019-11-08 | Commentators: Jordan, Rusty and JoshEpisode info: https://pwny.racing/episodes/episode-csaw/Tournament bracket: challonge.com/csaw_pwny_racing9:00 Game 1: PPP v GreyHatGT57:10 Game 3: Sice Squad v Antisice Amigos1:38:15 Game 4: Zero Cost Abstractions v RPISEC2:58:34 Game 2: Sigpwny v Kernel Sanders4:38:44 Game 5: Perfect Blue v PPP5:44:11 Game 6: Kernel Sanders v dcua6:34:04 Game 7: Sice Squad v Perfect Blue7:20:43 Game 8: Kernel Sanders v Zero Cost Abstractions8:46:14 Game 10: Kernel Sanders v Perfect Blue10:05:58 Game 9: Zero Cost Abstractions v Sice Squad
Pwny Racing - Episode 9 Calle Svensson 2019-10-26 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: niklasb, jazzy, mightymo, zzzWinner: niklasbEpisode info and challenge download: https://pwny.racing/episodes/episode9/
Pwny Racing - Episode 8 Calle Svensson 2019-09-28 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: XeR, nneonneo, honululu & nandayoWinner: nneonneoTechnical issues starts at 08:30Technical issues resolved at 16:45Episode info and challenge download: https://pwny.racing/episodes/episode8/
Pwny Racing - Community Challenge 1 Calle Svensson 2019-08-31 | In this video we do a run through of the Pwny Racing Community Challenge #1. We explain the challenge, the bugs, how to exploit it and some general tips and tricks when it comes to reverse engineering and exploitation.Hosts: ZetaTwo & b0bbChallenge author: b0bbMore information about the community challenge: https://pwny.racing/communitychallenge/
Pwny Racing - Episode 7 Calle Svensson 2019-08-22 | Commentators: Zeta Two & VitoChallenge author: b0bbParticipants: spq, zap, quend and aweinstockWinner: spqStream starts at 19:25Episode info and challenge download: https://pwny.racing/episodes/episode7/
Pwny Racing - Episode 6 Calle Svensson 2019-07-27 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: acez, blasty, likvideraWinner: acezStream starts at 08:52Episode info and challenge download: https://pwny.racing/episodes/episode6/
Pwny Racing - Episode 5 Calle Svensson 2019-06-29 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: nneonneo, KidOfArcania, ottizy & MurmusCTFWinner: nneonneoStream starts at 10:40Episode info and challenge download: https://pwny.racing/episodes/episode5/
Pwny Racing - Episode 4 Calle Svensson 2019-05-25 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: laxa, mrtumble, kileak & Lord_IdiotWinner: Lord_IdiotStream starts at 10:10Episode info and challenge download: https://pwny.racing/episodes/episode4/
Pwny Racing - Episode 3 Calle Svensson 2019-04-13 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: jinmo, mak and retr0idWinner: jinmoStream starts at 09:55Episode info and challenge download: https://pwny.racing/episodes/episode3/Welcome to the third episode of Pwny Racing in which the participants race to be the first to solve a pwnable challenge.
Säkerhets-SM 2019 Challenge Solutions Calle Svensson 2019-03-19 | Säkerhets-SM (Swedish high-school championship in hacking), https://sakerhetssm.se/ just finished and I was part of the organizing group. In this live stream I will go through and solve the challenges from the competition and explain methodology, tools and how to approach different challenges.
Pwny Racing - Episode 2 Calle Svensson 2019-03-09 | Commentators: Zeta Two & b0bbCrew: LarsHChallenge author: b0bbParticipants: borysp, zap, vos and hpmvWinner: vosStream starts at 08:45Episode info and challenge download: https://pwny.racing/episodes/episode2/Welcome to the second episode of Pwny Racing in which the participants race to be the first to solve a pwnable challenge.Our test run was a huge success and we will therefore continue the concept. We will be back in this second episode with new participants and a new challenge. Hopefully, we'll have some improvements to the setup in place as well.
Pwny Racing - Episode 1 Calle Svensson 2019-02-09 | Commentators: Zeta Two & b0bbChallenge author: b0bbParticipants: jay, endeavor and MurmusWinner: MurmusStream starts at 05:28Episode info and challenge download: https://pwny.racing/episodes/episode1/Welcome to the first episode of Pwny Racing in which the participants race to be the first to solve a pwnable challenge. This episode is something of a test run where we try out the concept and see that the technical side is working. The stream starts at 05:28 there is some doubled audio the first few minutes. Sorry for that.
Hacking with Zeta Two - Guest lecture on Basics of Binary Exploitation at KTH 29/1 2019 Calle Svensson 2019-02-05 | On the 29th of January, I was invited as a guest lecturer as part of the Ethical Hacking course at the Royal Institute of Technology, KTH, here in Stockholm where I once studied, to talk about the basics of binary exploitation. The awesome AV crew at KTH recorded the talk and I'm publishing it here for everyone to enjoy. Slides are available on my website: zeta-two.com/education/2019/02/05/kth19-talk.html
OverTheWire Advent Bonanza 2018 - Challenge 13, Honor The Gods Calle Svensson 2018-12-17 | This video is how I "solved" challenge 13 of the OverTheWire Advent calendar CTF. The meatballs and pasta turned out fairly well actually. I'm proud.OverTheWire Advent Bonanza 2018: advent2018.overthewire.org
Solving an old challenge by LarsH Calle Svensson 2018-10-20 | Doing a blind solve of an old challenge by my teammate LarsH
Solving the MurmusCTF community challenge Calle Svensson 2018-09-25 | I will participate in the community challenge created by MurmusCTF (twitter.com/MurmusCTF) where multiple people stream/record solving the same challenge. I have not looked at the challenge nor the other streamers before attempting this.Post stream comment:Unfortunately, I did solve the challenge but the stream still contain a lot of good parts I think. If you are watching this afterwards and are short on time I would primarily recommend the first 1.5 hours and then skip to around the 2:30 mark and watch an hour from there.Rough timeline:Part 1 - Arbitrary read/write00:00:00 - Intro00:03:30 - Initial reversing00:08:45 - First run00:12:00 - Setup dynamic testing environment00:15:00 - Suspected relative read/write primitive00:20:00 - Suspected arbitrary read/write primitive00:23:00 - Script read/write primitive00:33:00 - First debugging00:36:00 - Arbitrary read confirmed00:47:00 - Leak data00:50:00 - rand() prediction possible00:58:00 - read GOT01:01:00 - try to overwrite GOT01:12:00 - realize Full RELRO = GOT readonly01:18:00 - start looking for other methods01:26:00 - checkpoint summary01:30:30 - find stack relative write01:32:00 - struggle starts02:07:00 - fail at googling (this is where everything went wrong)Part 2 - Unintended solution02:12:00 - increment ret ptr02:33:00 - discussion about memory corruption02:35:00 - struggle continues02:53:00 - new exotic idea03:05:00 - ret increments idea formalized03:09:00 - relative jmp in libc03:23:00 - relative jmp scripted and readyPart 3 - Gadget hunting03:42:00 - recap04:33:00 - the 3 hour exploit04:38:00 - gadget hunting continues05:08:00 - surrender
Solving q3ks hardflag challenge pt.2 Calle Svensson 2018-07-30 | In the last stream, I made an attempt to solve of a CTF challenge called "hardflag" created by q3k for the WCTF 2018. I hadn't looked at the challenge beforehand and it proved very hard. After the stream, I spent more time during the week to try to solve it and finally managed to do so. In this stream I will go through what I did, how I did it, what I learned from the process and the mistakes I made. Hopefully, it will give some insight to how you can approach these kind of problems.
Solving q3ks hardflag challenge Calle Svensson 2018-07-21 | I will try to do a blind solve of a CTF challenge called "hardflag" created by q3k for the WCTF 2018. I haven't looked at the challenge beforehand but judging from the tweet it involves Verilog and RISC-V, two concepts I have not worked with so this is going to take a while. Enjoy the ride.
Walkthrough of dJulkalendern 2017 Calle Svensson 2017-12-25 | Speed solving and doing a walkthrough of the dJulkalendern 2017 puzzle (https://djul.datasektionen.se)Table of Contents:Start: 03:15Day 00: 04:50Day 01: 05:55Day 04: 08:10Day 05: 12:20Day 06: 17:55Day 07: 19:35Day 08: 25:45Day 11: 32:30Day 12: 37:25Day 13: 40:20Day 14: 46:10Day 15: 50:40Day 18: 1:00:50Day 19: 1:06:20Day 20: 1:11:05Day 21: 1:23:45Day 22: 1:40:10Day -1: 2:00:25
Solving a CTF challenge by @nxsolle Calle Svensson 2017-11-25 | Blind solve of a CTF challenge by @nxsolle
Solving a crackme by Xvpz Calle Svensson 2017-11-18 | Blind solve of a crackme by XvpzChallenge download: https://crackmes.one/crackme/5ab77f5333c5d40ad448c0dd
SMT in reverse engineering, for dummies Calle Svensson 2016-11-05 | This is a re-recording of my lightning talk "SMT in reverse engineering, for dummies" which I presented at SEC-T 0x09 (sec-t.org) this September.The talk introduces how SMT can be used in reverse engineering with the help of tools such as Z3 (z3.codeplex.com) and angr (http://angr.io).The code I'm referring to in the presentation can be found on my website (zeta-two.com/education/2016/09/08/sect2016-talk.html)
