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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. whitequark‏ @whitequark 22 Sep 2019
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      @munin so apparently most unmanaged switches have a 8051 connected to the switch fabric inside. would it occur to you that pretty much any switch on your network could be monitoring or injecting traffic? sure would not to me

      3 replies 6 retweets 31 likes
      Show this thread
    2. whitequark‏ @whitequark 22 Sep 2019
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      whitequark Retweeted whitequark

      anything on the very popular RTL836x series would be susceptible... and note that the datasheet for those chips doesn't mention that it has a CPU -at all-https://twitter.com/whitequark/status/1175699669466284032 …

      whitequark added,

      whitequark @whitequark
      Replying to @whitequark @erincandescent @M_Labs_Ltd
      the one you linked is RTL8367, that doesn't have public docs, but RTL8366 does. Ctrl+f 8051 → 0 results, and there's no CPU on the block diagram, but... pic.twitter.com/I3yRvZeeBn
      3 replies 6 retweets 15 likes
      Show this thread
    3. Hector Martin‏ @marcan42 22 Sep 2019
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      Replying to @whitequark

      Ultra-cheap managed switches use this to run a webui. I have one at home. I also have an unmanaged one where I patched the firmware to enable magic control packets on one port that can be used to configure VLANs, etc. It's all pretty common.

      2 replies 0 retweets 7 likes
    4. Hector Martin‏ @marcan42 22 Sep 2019
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      Replying to @marcan42 @whitequark

      The CPU is hideously underpowered though, so I doubt it can be used for too many nefarious purposes without causing issues. You can't, like, inspect all traffic or something.

      1 reply 0 retweets 3 likes
    5. whitequark‏ @whitequark 22 Sep 2019
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      Replying to @marcan42

      i think it's mostly useful for persistence

      1 reply 0 retweets 1 like
    6. whitequark‏ @whitequark 22 Sep 2019
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      Replying to @whitequark @marcan42

      less "monitor all traffic" and more "listen for magic sequence and run this exploit then" or something like it. ambient persistence

      1 reply 0 retweets 3 likes
      Hector Martin‏ @marcan42 22 Sep 2019
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      Replying to @whitequark

      Yeah, you could at least use it as a control bouncer or the like.

      6:58 AM - 22 Sep 2019
      • 1 Like
      • sarah@ganbaranai
      1 reply 0 retweets 1 like
        1. sarah@ganbaranai‏ @winocm 22 Sep 2019
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          Replying to @marcan42 @whitequark

          Technology is too paranoia inducing.

          0 replies 0 retweets 2 likes
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