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Posts by Mitja Kolsek

Me standing next to a conceptual work of art based on my keynote. I’m wearing a black dress and my dark wavy hair has a gradient from purple to hot pink.

Me standing next to a conceptual work of art based on my keynote. I’m wearing a black dress and my dark wavy hair has a gradient from purple to hot pink.

Karaokeynote for @bsidessf.org is in the bag & now I’m free to enjoy the rest of the conference. Alright everyone, you heard me: go save the world! 🌺💖

4 weeks ago 51 3 3 0

Thank you, dad, for bringing this machine to my life. It was a fun box with a huge impact for this 12-year-old then, as well as for thousands of 0patch users worldwide today.

1 month ago 0 0 0 0

With its 6 KB of memory, even with a built-in BASIC interpreter, I was forced to learn coding in Z80 assembly to get anything interesting done. A minor detail in retrospect, but without that, @0patch.bsky.social would likely not exist today as we're writing our security patches in assembler.

1 month ago 0 0 1 0

So each Galaksija is basically unique, ours having a wooden case for the computer, and a plastic box for the sound extension (attached at its back), both covered with black wallpaper.

1 month ago 0 0 1 0

Galaksija came as a DIY kit, requiring one to solder all components to the motherboard, assemble the keyboard, obtain additional chips from a small electronics shop in Austria, but most notably -- create one's own chassis.

1 month ago 0 0 1 0

Big thanks to BSidesLjubljana (0x7ea.bsidesljubljana.si) for allowing me to show Galaksija to conference attendees before handing it over to the museum.

1 month ago 0 0 1 0
Photo of my computer Galaksija, with a sound extension attached

Photo of my computer Galaksija, with a sound extension attached

42 years after my father and I had assembled it, our first computer "Galaksija" has found a new home at Computer History Museum (www.racunalniski-muzej.si), where diligent caretakers of our regional computer history will have it displayed for nostalgic and curious visitors.

1 month ago 2 1 1 0

All that the Turing Test proves is that human are much, much stupider than Alan Turing ever suspected.

3 months ago 484 78 12 5

Oh, clever, thanks!

4 months ago 1 0 0 0

Of course having the server auto-sign a customized installer would be a seriously risky thing to do (exposing the signing key) and today with the requirement for the key to be on a secure hardware device may also be impossible to implement. So are customized installers even possible anymore?

4 months ago 0 0 1 0
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Thanks, Eric, for explaining why this is a bad idea. When one wants to provide users with a signed installer, but also make it super easy for said installer to be able to auto-register the product to user's account, adding user-specific data as padding sounds like almost the only reasonable option.

4 months ago 0 0 1 0
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Adobe tries to cheat Authenticode, which can result in additional blocks and security warnings.

textslashplain.com/2024/11/15/b...

4 months ago 6 1 2 0
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Tap-and-Steal: The Rise of NFC Relay Malware on Mobile Devices NFC relay malware on Android devices is exploiting Tap-to-Pay systems, targeting financial institutions globally with sophisticated attacks and minimal user interaction.

Zimperium has discovered more than 760 Android apps that steal and relay NFC data to a remote attacker

zimperium.com/blog/tap-and...

5 months ago 10 5 0 1
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Introducing Aardvark: OpenAI’s agentic security researcher Now in private beta: an AI agent that thinks like a security researcher and scales to meet the demands of modern software.

Aardvark is a labor of love and mission for the whole team. We are super excited to bring it to you. Sign up for the beta immediately!!! openai.com/index/introd...

5 months ago 7 4 1 1
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The latest WindowsUpdate disables Windows Explorer previews for files that were downloaded from the Internet or are on Internet Zone network shares.

gist.github.com/ericlaw1979/...

6 months ago 2 1 0 0
For our scientists
For our scientists YouTube video by Elle Cordova

Need a summary of all the ways the White House has gutted science?

🧪Or are you scientist who needs to hear your work valorized in song?

From brilliant songwriter, Elle Cordova:

“If they don’t like the data in your graphs/they’ll just turn the lights out in your lab”

youtube.com/shorts/AYm9w...

6 months ago 42 16 1 0
Search Jobs | Microsoft Careers

Come work with me on Microsoft Defender for Endpoint!
jobs.careers.microsoft.com/global/en/jo...

7 months ago 4 2 0 0
One Token to rule them all - obtaining Global Admin in every Entra ID tenant via Actor tokens While preparing for my Black Hat and DEF CON talks in July of this year, I found the most impactful Entra ID vulnerability that I will probably ever find. One that could have allowed me to compromise ...

I've been researching the Microsoft cloud for almost 7 years now. A few months ago that research resulted in the most impactful vulnerability I will probably ever find: a token validation flaw allowing me to get Global Admin in any Entra ID tenant. Blog: dirkjanm.io/obtaining-gl...

7 months ago 87 37 9 5
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Unicode 16.0.0

If you want to understand the struggle anyone doing input validation has, just look at ver 16.0 of the unicode standard: unicode.org/versions/Uni...

Unicode 16.0 adds 5185 characters, for a total of 154,998 characters

244 pages.

yeah, good luck with that.

<script>alert('𐒀𐒁𐒂')</script>

7 months ago 6 4 0 0
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The Alot is Better Than You at Everything As a grammatically conscientious person who frequents internet forums and YouTube, I have found it necessary to develop a few coping mechani...

The Alot is better than you...

hyperbole-andahalf.blogspot.com/2016/08/the-...

7 months ago 1 1 1 0
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So Long to Tech’s Dream Job

Five-ish years ago, @lizthegrey.com told me tech workers needed to organize because the tech giants would automate their jobs, the market would flood with talent and they would lose bargaining power. I thought it was unlikely. Here’s a story about me being wrong. www.nytimes.com/2025/08/04/t...

8 months ago 299 82 5 5
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Morning in Kyiv. No sleep. Air quality is extremely bad. City is covered in thick smoke.

This is Russian terror, aimed at people who chose to stay, resist and fight.

9 months ago 1806 826 94 59
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Re-reading Stumbling on happiness by @danielgilbert.bsky.social and loving every page again. Relatable facts, interesting actual and thought experiments wrapped in just my type of humor.

9 months ago 2 0 0 0

OAuth is hard and we often find security flaws, but this is next level. Kudos to Modzero.

9 months ago 3 1 0 0

A friendly reminder from the Patron Saint of the Internet, Deth Veggie

9 months ago 15 5 1 0

So sorry to hear this. Chipped in and sharing.

9 months ago 1 0 0 0
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Hey, we can sell you a USB-HDMI adapter that works well in your office but flickers on stage.

10 months ago 1 0 0 0
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Roundcube ≤ 1.6.10 Post-Auth RCE via PHP Object Deserialization [CVE-2025-49113] A deep technical breakdown of CVE-2025-49113, a critical Roundcube vulnerability involving PHP session serialization. Learn how the bug was discovered, exploited, and responsibly disclosed with full P...

Threat actors are exploiting a recently patched vulnerability in the Roundcube webmail server.

Attacks began two days after a patch was published on GitHub.

FearsOff believes attackers bin-diffed the code before a final patch was ready and started exploiting servers.

fearsoff.org/research/rou...

10 months ago 7 2 1 1