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Aaron Parecki

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  • Aaron Parecki
    Contributions from: Canada, Spain, United Kingdom, United States
    Sun, May 31, 2020 4:03pm -07:00
  • Jerry Gamblin https://twitter.com/JGamblin   •   May 31
    Ok... what would you call it then?
    Aaron Parecki
    Posted a full writeup with a lot more details: https://aaronparecki.com/2020/05/31/30/the-real-cause-of-the-sign-in-with-apple-zero-day
    Portland, Oregon • 61°F
    1 like 1 repost
    Sun, May 31, 2020 1:50pm -07:00
  • Vinod Anandan https://twitter.com/_VinodAnandan   •   May 31
    Thanks, that will be greatly appreciated. If you could also include the sample id_token in the post, it would help to clarify some doubts.
    Aaron Parecki
    Alright, it's up! https://aaronparecki.com/2020/05/31/30/the-real-cause-of-the-sign-in-with-apple-zero-day
    Portland, Oregon • 61°F
    2 likes 1 repost
    Sun, May 31, 2020 1:50pm -07:00
  • The Real Cause of the Sign In with Apple Zero-Day

    The zero-day bug in Sign In with Apple actually had nothing to do with the OAuth or OpenID Connect part of the Sign In with Apple exchange, and very little to do even with JWTs. Let's take a closer look to see what actually happened.
    continue reading...
    37 likes 19 reposts 1 bookmark 9 replies 25 mentions
    Sun, May 31, 2020 1:49pm -07:00 #oauth #oidc #apple #siwa #security #zeroday
  • Hans Zandbelt https://twitter.com/hanszandbelt
    So at first Apple shortcutted OIDC protocol steps in SIWA which rendered them insecure, after fixing that they went on to add extras on top of OIDC which now renders them insecure again. It should be clear to everyone now: don't roll your own. #openid #siwa
    Portland, Oregon • 60°F
    Sun, May 31, 2020 6:43pm +00:00 (liked on Sun, May 31, 2020 12:47pm -07:00) #openid #siwa
  • Jerry Gamblin https://twitter.com/JGamblin   •   May 31
    Ok... what would you call it then?
    Aaron Parecki
    lack of form validation
    Portland, Oregon • 58°F
    1 like
    Sun, May 31, 2020 11:12am -07:00
  • Jerry Gamblin https://twitter.com/JGamblin   •   May 31
    Yep, I realized that after I posted and made a clarifying post in the thread, which you should have saw?
    Aaron Parecki
    I should have replied to that one. It’s barely a logic bug using JWT. I’m writing up more details in a blog post, will post a link shortly.
    Portland, Oregon • 58°F
    2 replies
    Sun, May 31, 2020 11:11am -07:00
  • Jerry Gamblin https://twitter.com/JGamblin   •   May 30
    Interesting JWT vulnerability. https://bhavukjain.com/blog/2020/05/30/zeroday-signin-with-apple/
    Aaron Parecki
    This has almost nothing to do with JWTs, or even OpenID Connect for that matter.
    Portland, Oregon • 58°F
    2 likes 4 replies
    Sun, May 31, 2020 11:06am -07:00
  • Dieter Bohn https://twitter.com/backlon
    When writing headlines, use the active voice and clearly identify subjects. https://www.theverge.com/2020/5/31/21276044/police-violence-protest-george-floyd
    Portland, Oregon • 57°F
    Sun, May 31, 2020 5:06pm +00:00 (liked on Sun, May 31, 2020 10:53am -07:00)
  • Tony Jordan 😹👀 https://twitter.com/twjpdx23
    This is a great illustration of how much space cars waste!

    They say that up to 230 cars will be able to fit in the stadium to watch the movie. 230 cars in the whole damn stadium.

    If this is the future, I don’t wanna be in it. https://www.miamiherald.com/miami-com/things-to-do/article243003896.html
    Portland, Oregon • 57°F
    Sun, May 31, 2020 5:27pm +00:00 (liked on Sun, May 31, 2020 10:30am -07:00)
  • Aaron Parecki
    Contributions from: Canada, Spain, United Kingdom, United States
    Sun, May 31, 2020 10:21am -07:00
  • Kate Efimova 💫 https://twitter.com/kefimochi
    Being sick of politics AND having an environment where you can stop thinking about current state of the world is called PREVILEGE.

    YOU HEARD IT!
    Portland, Oregon • 56°F
    Sun, May 31, 2020 3:28pm +00:00 (liked on Sun, May 31, 2020 10:08am -07:00)
  • BLACKLIVESFUCKINGMATTER https://twitter.com/alexsimoneex
    i feel sorry the kids who are gonna study 2020 in history 😭, this chapter is HEFTY.
    1 like
    Thu, May 28, 2020 2:11pm +00:00 (reposted on Sun, May 31, 2020 10:00am -07:00)
  • ziwe https://twitter.com/ziwe
    there are two americas: one fights for black lives and the other fights for brunch
    Portland, Oregon • 56°F
    Sun, May 31, 2020 3:39pm +00:00 (liked on Sun, May 31, 2020 9:59am -07:00)
  • Vinod Anandan https://twitter.com/_VinodAnandan   •   May 31
    Yes, thank you. I agree that RP should be simple and IdP should be handling the complexity. AFAIU, the OIDC spec is clear about the email_verified attribute.
    Aaron Parecki
    The original post didn’t make this clear, so I’m writing a new post to hopefully better explain the problem. You’ll see that it has nothing to do with OIDC at all. Link coming shortly, I hope.
    Portland, Oregon • 55°F
    2 replies
    Sun, May 31, 2020 9:36am -07:00
  • Torsten Lodderstedt https://twitter.com/tlodderstedt
    Another remark: this issue wouldn’t have allowed account takeover at the RP if the RP would use iss+sub claim to identify the user account instead of relying on the email address (potentially even without scoping it within the particular IDP). Poor coding practice too.
    Portland, Oregon • 54°F
    Sun, May 31, 2020 2:44pm +00:00 (liked on Sun, May 31, 2020 7:57am -07:00)
  • Vinod Anandan https://twitter.com/_VinodAnandan   •   May 31
    My point is that OIDC has mechanisms to prevent this issue..
    Aaron Parecki
    Please go read it again and understand the problem
    Portland, Oregon • 54°F
    4 replies
    Sun, May 31, 2020 7:32am -07:00
  • Vinod Anandan https://twitter.com/_VinodAnandan   •   May 31
    "email_verified" : "True if the End-User's e-mail address has been verified; otherwise false....."

    https://openid.net/specs/openid-connect-core-1_0.html
    Aaron Parecki
    Go read the writeup again. The original post wasn't the clearest explanation of the problem but I also posted some more details in this thread that make it clearer.
    Portland, Oregon • 54°F
    6 replies
    Sun, May 31, 2020 7:28am -07:00
  • Vinod Anandan https://twitter.com/_VinodAnandan   •   May 31
    "The OpenID Foundation enables deployments of OpenID Connect and the Financial-grade API (FAPI) Read/Write Profile to be certified to specific conformance profiles to promote interoperability among implementations.... "

    https://openid.net/certification/
    Aaron Parecki
    And? certification wouldn't have caught this bug since it wasn't a problem with the OIDC part of the exchange.
    Portland, Oregon • 54°F
    Sun, May 31, 2020 7:22am -07:00
  • Barbara Schachner https://twitter.com/barschachner
    Fully agree to that 😀

    Just looking also at examples like https://insomniasec.com/blog/auth0-jwt-validation-bypass or https://threatpost.com/microsoft-oauth-flaw-azure-takeover/150737/.
    o/c they are different + very individual, but if already the big players have such issues, how much more can go wrong on RS side where devs are usually not Auth experts.
    Portland, Oregon • 54°F
    Sun, May 31, 2020 1:41pm +00:00 (liked on Sun, May 31, 2020 6:43am -07:00)
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Hi, I'm Aaron Parecki, Director of Identity Standards at Okta, and co-founder of IndieWebCamp. I maintain oauth.net, write and consult about OAuth, and participate in the OAuth Working Group at the IETF. I also help people learn about video production and livestreaming. (detailed bio)

I've been tracking my location since 2008 and I wrote 100 songs in 100 days. I've spoken at conferences around the world about owning your data, OAuth, quantified self, and explained why R is a vowel. Read more.

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