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DEF CON 25 - Hanno Bõck - Abusing Certificate Transparency Logs

DEFCONConference · Youtube · 1 HN comments
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Youtube Summary
The Certificate Transparency system provides public logs of TLS certificates. While Certificate Transparency is primarily used to uncover security issues in certificates, its data is also valuable for other use cases. The talk will present a novel way of exploiting common web applications like Wordpress, Joomla or Typo3 with the help of Certificate Transparency.

Certificate Transparency has helped uncover various incidents in the past where certificate authorities have violated rules. It is probably one of the most important security improvements that has ever happened in the certificate authority ecosystem. In September 2017 Google will make Certificate Transparency mandatory for all new certificates. So it's a good time to see how it could be abused by the bad guys.
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Interesting timing, considering the talk [0] on this very topic just uploaded to YouTube yesterday morning from DefCon 25. Basically, this is offering his observation (CTL can be used to get a real-time list of new domain names, which can be exploited), as a service.

Seems like Hanno Bõck could at least use a shout out if it was related to his work.

Either way, the talk is worth a watch.

[0] https://www.youtube.com/watch?v=TMNeSnjZfCI&list=PL9fPq3eQfa...

zer01
Interesting! I haven't been able to attend Defcon in the past few years so I haven't seen that talk (or heard of his research), but it's something I've thought about for a while now - using CTLs as a means to jump into the early process of setting up webapps and whatnot.

Thanks for the video!

tty7
Shout out isnt needed, i did the same thing as Hanno over a weekend early this year. Been kicking myself since defcon that i didn't submit a talk!

Anyone who reads the certificate transparency log rfc can quickly realize whats possible.

I've also been following calidog since his first medium post, ive got my own similar cert scanner/tracker.

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