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tehjh's profile
Jann Horn
Jann Horn
Jann Horn
@tehjh

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Jann Horn

@tehjh

works at Google Project Zero. personal account.

Joined August 2011

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    1. Jake Williams‏ @MalwareJake 24 Jun 2018
      • Report Tweet
      • Report NetzDG Violation

      TLBleed leaks private keys with a 98%+ reliability. But it doesn't leak them the "right" way, so it's not in scope for their bug bounty. Also Intel isn't even assigning this a CVE. This will require a ton of work to mitigate (mostly app recompile). 1/n https://www.theregister.co.uk/2018/06/22/intel_tlbleed_key_data_leak/ …pic.twitter.com/LsRCjCerZD

      6 replies 72 retweets 107 likes
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    2. Jake Williams‏ @MalwareJake 24 Jun 2018
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      First, it's ridiculous that this isn't eligible for a bug bounty. It's insane that Intel thinks it doesn't deserve a CVE. Second, it's hard to imagine that Intel won't make changes to their processors to fix this. TLB management has subtle nuances depending on the architecture 2/

      3 replies 4 retweets 27 likes
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      Jann Horn‏ @tehjh 24 Jun 2018
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      Replying to @MalwareJake

      from what I've seen, TLBleed is some really nice work, but it sounds as if it's not a problem if you adhere to the well-known rule for crypto software that all control flow and memory access patterns must be secret-independent?

      9:32 AM - 24 Jun 2018
      • 4 Retweets
      • 13 Likes
      • コルっち Joachim Schipper Youri Mouton Arto Bendiken Herbert Bos Tony “Abolish ICE” Arcieri 🦀 Ben Gras Jon Masters 🏴‍☠️ Yuval Yarom
      2 replies 4 retweets 13 likes
        1. New conversation
        2. Ben Gras‏ @bjg 24 Jun 2018
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          Replying to @tehjh @MalwareJake

          Yes, Jann, you are right, TLBleed is fundamentally no more powerful than the age-old same-core cache side channel. there are some significant novelties IMO, but fundamentally the point is different: show that cache attack protection (eg isolation) doesn't solve side channels.

          1 reply 2 retweets 10 likes
        3. Ben Gras‏ @bjg 24 Jun 2018
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          Replying to @bjg @tehjh @MalwareJake

          Although w.r.t. the bounty, in my opinion, it is goalpost-moving to after-the-fact stipulate conditions on the software running on the cpu if the product in question is the cpu.

          0 replies 0 retweets 4 likes
        4. End of conversation
        1. John Poffenbarger‏ @jpoffenb 24 Jun 2018
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          Replying to @tehjh @lavados @MalwareJake

          If you crypto-offload and split keys, this becomes mostly irrelevant. That these issues will continue for some time was my motivation in forming DefiniSec.

          0 replies 0 retweets 0 likes
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