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__agwa's profile
Andrew Ayer
Andrew Ayer
Andrew Ayer
@__agwa

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Andrew Ayer

@__agwa

Founder of @SSLMate, author of Cert Spotter. I do #webpki and #CertificateTransparency stuff.

San Francisco Bay Area
agwa.name
Joined November 2011

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    1. mhoye‏ @mhoye Aug 27

      I just want to talk for a minute about the upcoming Symantec certificate-distrust action that's coming due in a few weeks. This isn't a company policy statement, but I want to mention some underappreciated implications.

      1 reply 17 retweets 8 likes
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    2. mhoye‏ @mhoye Aug 27

      This was announced in March: https://blog.mozilla.org/security/2018/03/12/distrust-symantec-tls-certificates/ … and reiterated most recently here: https://blog.nightly.mozilla.org/2018/08/14/symantec-distrust-in-firefox-nightly-63/ … - and we've done our best to make people aware of what's going to happen and why.

      1 reply 4 retweets 3 likes
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    3. mhoye‏ @mhoye Aug 27

      The easiest way to check to see if a site is affected is to plug their URL into the Mozilla Observatory: https://observatory.mozilla.org/  - you'll get a big, red above-the-fold warning if your site's cert is affected. The thing is: It's not only Symantec, it's also their resellers.

      1 reply 1 retweet 5 likes
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    4. mhoye‏ @mhoye Aug 27

      There are two things that I'm concerned are widely misunderstood about this. The first is that it's not just Symantec certificates; Symantec resellers include Thawte, GeoTrust, RapidSSL and others who will also be subject to the distrust action.

      2 replies 2 retweets 0 likes
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    5. mhoye‏ @mhoye Aug 27

      So, that's probably bad. But a slightly subtler thing I've been worried about for a while now is that most (maybe all?) of the major Linux distributions rely on Mozilla's certificate store at the OS level.

      1 reply 0 retweets 1 like
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    6. mhoye‏ @mhoye Aug 27

      This is going to be a slower burn, but as installed OSes get updated things like "curl https [whatever]" for values of [whatever] that have affected certs at the far end will stop working.

      1 reply 1 retweet 1 like
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    7. mhoye‏ @mhoye Aug 27

      I expect bleeding-edge distributions like Sid or Rawhide will update their certificate stores shortly after the revised Firefox certificate list makes it into the release channel - it's live in Nightly now - and downstream OSes will inherit those changes per schedule.

      2 replies 0 retweets 0 likes
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      Andrew Ayer‏ @__agwa Aug 27
      Replying to @mhoye

      Debian gets its trust store from NSS' certdata.txt. Per https://wiki.mozilla.org/CA/Additional_Trust_Changes#Symantec … no date has been set for removing the website trust bit from Symantec roots, which means Debian will continue trusting Symantec certs even after 63 is released.

      4:00 PM - 27 Aug 2018
      1 reply 0 retweets 0 likes
        1. mhoye‏ @mhoye Aug 27
          Replying to @__agwa

          Even when the date gets confirmed, I expect widespread adoption to happen slowly, across standard release schedules, not everywhere and all at once. My concern is that this will make breakage harder to understand or resolve.

          0 replies 0 retweets 0 likes
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