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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Matthew Green‏ @matthew_d_green 19 Dec 2017
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      New blog: The Strange Story of “Extended Random”. About crypto backdoors and RSA.https://blog.cryptographyengineering.com/2017/12/19/the-strange-story-of-extended-random/ …

      7 replies 163 retweets 210 likes
    2. Hector Martin‏ @marcan42 20 Dec 2017
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      Replying to @matthew_d_green

      So I have a Canon consumer inkjet printer, Japanese model, purchased in Japan. No HTTPS on the web interface, but it speaks Cloud Print with Google, and guess what.pic.twitter.com/77MnG9zeYd

      2 replies 11 retweets 27 likes
    3. Hector Martin‏ @marcan42 20 Dec 2017
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      Replying to @marcan42 @matthew_d_green

      Also, WTF is this. I thought the contents were supposed to be *random bytes*?pic.twitter.com/SsTp9NJWce

      4 replies 1 retweet 11 likes
    4. Brendan Dolan-Gavitt‏ @moyix 21 Dec 2017
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      Replying to @marcan42 @matthew_d_green

      Huh. Uninitialized buffer? If you have the model number it might be interesting to check out the firmware...

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @moyix @matthew_d_green

      Pixus MG6730. It updates itself over unencrypted HTTP (of *course*). The firmware seems to be obfuscated with some kind of silly DIY algorithm, though. Typical Japanese. The whole file looks like this. https://mrcn.st/t/mg6730_1.060.bin …pic.twitter.com/vMrLdlKOnq

      2 replies 0 retweets 1 like
    6. Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @marcan42 @moyix @matthew_d_green

      Oh gawd it's an S-record file with an XOR pad. Just why. Deobfuscated: https://mrcn.st/t/mg6730_1.060.srec … (two logical chunks: https://mrcn.st/t/mg6730_1.060_part1.srec … https://mrcn.st/t/mg6730_1.060_part2.srec …)

      1 reply 0 retweets 4 likes
    7. Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @marcan42 @moyix @matthew_d_green

      Looks like it runs DRYOS, the same OS Canon cameras use, and the same OS the CHDK project has quite ample documentation of. Cool.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @marcan42 @moyix @matthew_d_green

      Yeah, I'm pretty sure this is deliberate. @matthew_d_green, do you have code to compare? Looks like this stands for RSA BSAFE Micro Edition Suite I think?pic.twitter.com/lxZ6eMHI7o

      11:10 AM - 21 Dec 2017
      • 2 Likes
      • Jevin Sweval Brendan Dolan-Gavitt
      1 reply 0 retweets 2 likes
        1. New conversation
        1. Brendan Dolan-Gavitt‏ @moyix 21 Dec 2017
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          Replying to @marcan42 @matthew_d_green

          I think this matches what's in the BSAFE-Java library (source: http://dualec.org/DualECTLS.pdf )pic.twitter.com/QtHcu7GK5o

          1 reply 1 retweet 1 like
        2. Matthew Green‏ @matthew_d_green 21 Dec 2017
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          Replying to @moyix @marcan42

          We never analyzed the MES, and the C BSAFE library we did have (SSLC?) didn’t have watermarking activated. But yes it does match, with a slightly different watermark.

          1 reply 0 retweets 0 likes
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