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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    Casey Muratori‏ @cmuratori Jul 20

    This was a bad idea. If you wanted to require all control characters to be escaped, they should have had two-character escape codes for all of them. Because JSON doesn't, this means its amplification factor is 6x, which is a lot worse than 2x.pic.twitter.com/BUQTc7Kpwf

    11:14 AM - 20 Jul 2021
    • 41 Likes
    • Abhishek Cherath etmixCS BlueGhost 🌐 Vivitsu Maharaja Matthew Sitton N.E.C.L Media Rytis Daniel Kierkegaard Andersen bork
    4 replies 0 retweets 41 likes
      1. New conversation
      2. Casey Muratori‏ @cmuratori Jul 20

        I didn't realize this was a JSON requirement until I started reading the spec carefully, but this is a _very_ bad mistake.

        1 reply 0 retweets 21 likes
        Show this thread
      3. Casey Muratori‏ @cmuratori Jul 20

        The sad part is this could have been trivially fixed by just saying that the escape characters can all be escaped by \('a'+#) or something, and then it would have had an amplification factor of 2. But AFAICT, there is no way to escape many of the required codes with less than 6.

        2 replies 0 retweets 18 likes
        Show this thread
      4. End of conversation
      1. New conversation
      2. Dimiter "malkia" Stanev‏ @__malkia__ Jul 20
        Replying to @cmuratori

        What is the use case of sending (that many) control characters with JSON?

        1 reply 0 retweets 0 likes
      3. Casey Muratori‏ @cmuratori Jul 21
        Replying to @__malkia__

        There's no use case, it's a robustness requirement. A system wanting to guarantee UTF8->JSON compliance must handle this as an input, even if the only expect case if when an attacker crafts it specifically.

        0 replies 0 retweets 6 likes
      4. End of conversation
      1. Swarnim Arun‏ @swarnimarun Jul 21
        Replying to @cmuratori

        Damn why did I never notice !?!pic.twitter.com/PeCrGhcnUd

        0 replies 0 retweets 0 likes
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      1. Colonel Panic‏ @TopherIsSwell Jul 23
        Replying to @cmuratori

        I'm firmly convinced thatall of those random JSON parsing libraries I use handle this with grace...

        0 replies 0 retweets 0 likes
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