2020
sconwar – sensecon 2020
Much like other events in 2020, our annual internal hackathon took a remote format this year, sporting over 120 hackers from across the globe. We had many challenges available during the conference which included a password cracking challenge, a discord bot challenge and a programming challenge. This post will talk about the programming challenge called sconwar. You can get the source code for it here. Admittedly I was really nervous…
DualSense Reverse Engineering
Ciao belli! On the 19th of November 2020, SONY finally released the new PlayStation 5 in the UK. A few days earlier in the US, Japan, and Canada. Of course, Play Station 5 came together with a new Wireless Controller, this time named DualSense. I wanted to see if I could continue my PlayStation controller adventures on this new device, following on my previous work. A few SONY installations available…
sensecon 2020 ex post facto
When we finally decided on a date, sensecon 2020 was little over a month away. Unlike our public client events, internally sensecon is a three day conference filled with trainings, a hackathon and a ton of fun. Traditionally we would have had the hackathon in person, but this year our only option was to do it remotely. Overall we had a blast, both in the preparation phase but also during…
Szensecon Discord Bot
We have written a lot about SenseCon by now, but there is one more thing we can talk about! In this post I want to detail the Discord bot and associated challenges that we built. We were going to use Discord as our main communication channel and wanted a way to ensure that it was only accessible to Orange Cyberdefense hackers in an automated way. This was a good opportunity…
thumbscr-ews – a python EWS tool
Something I have found myself doing more and more often is using Exchange Web Services (EWS) to bypass 2FA. I do this so that I could look through mail for accounts I have compromised. The 2FA bypass is due to a common misconfiguration which can leave EWS unprotected, and has been known about for ages, mostly from the Black Hills post in 2016. However, most of the tooling appears to…
More On Foreign Hashes
This is an update on this previous post on foreign NT hashes where I got things a little wrong by believing the source encoding matters for an NT hash. It doesn’t really, let me show you why. I spent a bit of time exploring further, in particular, I took it down to a test case. Jameel gave me his name as a password in Arabic: Included as a picture because…
Pass-the-hash WiFi
Thanks to a tweet Dominic responded to, I saw someone mention Passing-the-hash when I think they actually meant relay. The terminology can be confusing for sure, however, it made me realise that I had never Passed-the-hash with a Wi-Fi network. So having learnt my lesson from previous projects I first made sure this was possible for NT -> MSCHAP by looking at the RFC. 8.1. GenerateNTResponse() GenerateNTResponse( IN 16-octet AuthenticatorChallenge,…
Let me store that for you
A while ago Jonas Lykkegaard disclosed a zeroday that could be used to create files in the SYSTEM folder. CVE-2020-16885 got assigned for this vulnerability, and was since patched with KB4580346. This vulnerability was very convenient for Dynamic-link library (DLL) side-loading, which I will show in this blog post. Below you can find his original Twitter message. Unprivileged users are not allowed to create files in system32 folder- on hyper-v…
building a hipster-aware pi home server
The end of the year is getting closer, fast, so I figured it was a perfect time to talk about my side project from last year. In this post I want to walk you through setting up a Raspberry Pi as a home server with all of your services running in docker containers with valid Let’s Encrypt certificates without exposing the Pi to the Internet. We will be setting up…
DirectAccess and Kerberos Resource-based Constrained Delegation
Are you tired of working from home due to COVID? While this is quite a unique situation we find ourselves in, it also provides some fresh opportunities. Lately we have assessed several environments that was meant to provide a secure way for working from home. For one specific engagement, a client delivered one of their laptops that was domain joined. The laptop was accompanied with credentials of a low privilege…
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