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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    Brian Smith‏ @BRIAN_____ 20 Oct 2014

    Note that the TLS 1.0 spec doesn't say the receiver MUST verify the padding (TLS 1.1 and TLS 1.2 do). So I bet some implementations don't.

    4:56 PM - 20 Oct 2014
    • 14 Retweets
    • 6 Likes
    • Beme Carnpbell Kenji Urushima Nick Sullivan Julien Savoie Can Acar Daira Hopwood (abolish ICE) CZA Hiroshi Nakamura Carl Winbäck
    3 replies 14 retweets 6 likes
      1. New conversation
      2. mik‏ @mik235 20 Oct 2014
        Replying to @BRIAN_____

        @BRIAN_____ How would you know the padding length without reading the last byte?

        1 reply 0 retweets 0 likes
      3. Marsh Ray‏ @marshray 20 Oct 2014
        Replying to @mik235

        @mik235 @BRIAN_____ You would read the last byte and ignore the values of the other padding bytes, which would be bad and is what SSLv3 does

        1 reply 0 retweets 0 likes
      4. mik‏ @mik235 20 Oct 2014
        Replying to @marshray

        @marshray @BRIAN_____ maybe I'm missing something, but isn't there a padding oracle either way?

        1 reply 0 retweets 0 likes
      5. mik‏ @mik235 20 Oct 2014
        Replying to @mik235

        @marshray @BRIAN_____ the MAC should've been the last bytes, with padding covered. (Or just use EtM mode and stop being stupid)

        1 reply 0 retweets 0 likes
      6. Marsh Ray‏ @marshray 20 Oct 2014
        Replying to @mik235

        @mik235 @BRIAN_____ Yes but when the other padding bytes aren't verified the attacker only has to guess 1 byte at a time. Easier to exploit.

        1 reply 0 retweets 0 likes
      7. mik‏ @mik235 20 Oct 2014
        Replying to @marshray

        @marshray @BRIAN_____ can't you just align the other way?

        1 reply 0 retweets 0 likes
      8. Marsh Ray‏ @marshray 20 Oct 2014
        Replying to @mik235

        @mik235 @BRIAN_____ The one required byte is always the last byte of the last block in the record. But maybe you see something I don't

        1 reply 0 retweets 0 likes
      9. mik‏ @mik235 20 Oct 2014
        Replying to @marshray

        @marshray @BRIAN_____ Why is the max 255? How does this interact with fragmentation?

        3 replies 0 retweets 0 likes
      10. 2 more replies
      1. @hirojin@dev.glitch.social‏ @hirojin 21 Oct 2014
        Replying to @BRIAN_____

        @ivanristic @BRIAN_____ is that why i see recommendations to turn off tlsv1 too?

        0 replies 0 retweets 0 likes
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      1. Daira Hopwood (abolish ICE)‏ @feministPLT 20 Oct 2014
        Replying to @BRIAN_____

        @BRIAN_____ @BrendanEich A MUST requirement to validate payload_length https://tools.ietf.org/html/rfc6520#section-4 … wasn't enough to stop heartbleed.

        0 replies 0 retweets 0 likes
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