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jedisct1's profile
Frank
Frank
Frank
@jedisct1

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Frank

@jedisct1

France
Joined November 2008

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    Frank‏ @jedisct1 Mar 13
    • Report Tweet
    • Report NetzDG Violation

    This is fun. The optical module of my home router is crashing my ISP’s FO splitters, and 32 customers immediately lose connectivity. They had never seen that before; my module is going to be sent out for expertise. Serious vulnerability in Cisco FO splitters?pic.twitter.com/FwtvhC79Vl

    2:28 AM - 13 Mar 2020 from Saint-Mandé, France
    • 7 Retweets
    • 24 Likes
    • OκULTRA XP🧿 Pierre Sarret AKA DrumSlayer P𝗿𝐞ⅆr𝚊ⓖ Ⅽ𝗎𝐉an𝚘𝕧ⓘć Guillaume Rischard FumesOver CK's Technology News Raito Bezarius Benjamin Beurdouche DEY!
    7 replies 7 retweets 24 likes
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      2. Pierre Sarret AKA DrumSlayer‏ @DrumSlayers Mar 13
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        Replying to @jedisct1 @xbeaudouin

        Splitters are passive equipment in street cabinet (PMZ), juste mirror that share the same optical link with other, you receive and send data to everyone on your tree . I think your ONT is sending corrupted data that is not TDD synced with the data of others clients maybe

        2 replies 0 retweets 4 likes
      3. Frank‏ @jedisct1 Mar 13
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        Replying to @DrumSlayers @xbeaudouin

        Interesting, thanks for clarifying! I must confess that I don’t know much about how these work. So, any bogus or malicious ONT could essentially break any equipment?

        1 reply 0 retweets 1 like
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      2. Xavier BEAUDOUIN 奇伟‏ @xbeaudouin Mar 13
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        Replying to @jedisct1

        So... A simple mirror on a fiber can crash anything... Very nice to know (and really would like to test... but I have no fiber)

        1 reply 0 retweets 0 likes
      3. Frank‏ @jedisct1 Mar 13
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        Replying to @xbeaudouin

        It’s more likely that corrupted frames are causing the splitter firmware to panic. I still have the module, in case a researcher wants to take a look before I send it 😀

        0 replies 0 retweets 2 likes
      4. End of conversation
      1. Denys Fedoryshchenko‏ @nuclearleb Mar 13
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        Replying to @jedisct1

        Flaws of shared bus that depend on TDMA only. On FTTH any faulty equipment that reflect signal or transmit not in time will case issues on same fiber. I dont think they are honest about not seeing that before (or this particular people have little experience).

        0 replies 0 retweets 1 like
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      1. CK's Technology News‏ @CKsTechNews Mar 13
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        Replying to @jedisct1

        Or maybe you got a hacked/compromised/malfunction device which simply is designed this way but without opening and inspecting it it's impossible to say.

        0 replies 0 retweets 0 likes
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      1. Raghu Veer Dendukuri‏ @raghuveer_d Mar 13
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        Replying to @jedisct1

        Raghu Veer Dendukuri Retweeted Frank

        Interesting 😃https://twitter.com/jedisct1/status/1238396626500308993?s=19 …

        Raghu Veer Dendukuri added,

        Frank @jedisct1
        This is fun. The optical module of my home router is crashing my ISP’s FO splitters, and 32 customers immediately lose connectivity. They had never seen that before; my module is going to be sent out for expertise. Serious vulnerability in Cisco FO splitters? pic.twitter.com/FwtvhC79Vl
        0 replies 0 retweets 0 likes
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      1. DEY!‏ @RoninDey Mar 14
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        Replying to @jedisct1

        This is damn interesting. This is no doubting a faulty unit, but a splitter, breaking a network is damn rare.

        0 replies 0 retweets 0 likes
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      1. Wojtek Gałązka‏ @GaWojtek Mar 15
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        Replying to @jedisct1 @RoninDey

        A splitter is a passive device with no logic. So do you really mean it?

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