Live data from Hacker News

Viewing profile — JohnLeitch

JohnLeitch

HN member
Joined
Sun, Jan 18, 2026, 9:50 PM UTC
HN karma
49
Public activity
33 items

About JohnLeitch

No profile information was provided.

Recent public activity

  1. comment
    Comment #46813789

    > refrain from setting background colors That's the thing though, setting bg color opens up a lot of options, and constraining to invert is not sufficient in my opinion.

  2. comment
    Comment #46784894

    [flagged]

  3. comment
    Comment #46784859

    Ah, okay. Thought you were talking about OOB heap write or something.

  4. comment
  5. comment
    Comment #46784776

    > though this would be a much more sophisticated exploit and is maybe a bit of a reach. Not necessarily. I have successfully exploited stack buffer overflows in major products desp…

  6. comment
    Comment #46784664

    It depends on what mitigations are in place and the arrangement of the stack. Even with stack canaries, having an unfortunate value on the stack e.g. a function pointer can still b…

  7. comment
    Comment #46784603

    Assuming you're talking about a heap buffer overrun, it's still possible to exploit for EoP in some cases.

  8. comment
    Comment #46751417

    While there's some overlap in methodologies and back-and-forth with various escalations, so-called malware is distinct from software exploits. Malware can be delivered without an e…

  9. comment
    Comment #46750989

    I was hit by this. Could RDP into machines using the regular client, but could not access Dev Boxes via Windows App. Getting real sick of the low quality AI slop.

  10. comment
    Comment #46750979

    Seems quite predictable given the others in the bug report encountering the same.

  11. comment
    Comment #46739497

    For sure. When it's out I'll give it a go.

  12. comment
    Comment #46738696

    Thanks for taking the time to respond, and apologies for the contentiousness. I'm a jaded old man suffering from severe LLM fatigue, so I may have come off a bit harsh. Your write-…

  13. comment
    Comment #46736108

    The problem is hallucinations. It's incredibly frustrating to have an LLM describe an API or piece of functionality that fulfills all requirements perfectly, only to find it was a …

  14. comment
    Comment #46736037

    Oh come on, the fact that the author was able to pull this off is surely indicative of some expertise. If the story started had started off with, "I asked the LLM how to capture ne…

  15. comment
    Comment #46728100

    Sure, but that is aside from my original point. If somebody: a) Has the knowledge to run tcpdump or similar from the command line b) Has the ambition to document and publish their …

  16. comment
    Comment #46728024

    >Is that because wireshark can't do that just from packet captures? Well, not quite. I think it's more that nobody has taken the time to implement it. That's not to say such an imp…

  17. comment
    Comment #46726728

    What are you even trying to say? I suppose I'll clarify for you: Yes, I'm confident I could have identified the cause of the mysterious packets quickly. No, I'm not going to go thr…

  18. comment
    Comment #46726078

    Not even remotely accurate. While the dissector is not as mature as I thought and there's no built-in decryption as there is for TLS, that doesn't matter much. Hint: every componen…

  19. comment
    Comment #46726049

    Well, I spent a good part of my career reverse engineering network protocols for the purpose of developing exploits against closed source software, so I'm pretty sure I could do th…

  20. comment
    Comment #46726031

    What I suggested (mistakenly so, see my revised suggested approach in response to one of your siblings) is the exact opposite of gate keeping.

  21. comment
    Comment #46726009

    Interesting, I thought it was possible to decrypt SSH in Wireshark a la TLS, but it seems I'm mistaken. It still would have been my first goto, likely with encryption patched out a…

  22. comment
    Comment #46725309

    The reliance on LLMs is unfortunate. I bet this mystery could gave been solved much quicker by simply looking at the packet capture in Wireshark. The Wireshark dissectors are quite…

  23. comment
    Comment #46723599

    >Current tests suggest it is not likely related to any other known psychedelic compound. For one, the trips it produces are unusually long, commonly lasting 12 to 24 hours, and in …

  24. comment
    Comment #46708673

    At risk of being called out for my ignorance (I am still new to GPU development and have only limited experience with CUDA), it seems to come down to how appropriate the execution …

  25. comment
    Comment #46707454

    Without disclosing too much, it was an app that stored text messages.