Bulletproof TLS Newsletter 
Bulletproof TLS Newsletter is a free periodic newsletter bringing you commentary and news surrounding SSL/TLS and Internet PKI, designed to keep you informed about the latest developments in this space. Received monthly by more than 50,000 subscribers. Maintained by Hanno Böck.
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Certificate Transparency data is used to compromise WordPress before installation
31 May 2022
Recently in the community forums of WordPress and Let's Encrypt, reports have shown up about webshells on freshly installed WordPress blogs that were later used for DDoS attacks. These attacks were also covered in an article at the Daily Swig.
The attack scenario in these reports was quite familiar to me. I realized this was a possibility early on when Certificate Transparency was introduced. I presented the attack in a talk at the DEF CON conference in 2017 and also covered it in an article back then. Independently, H. D. Moore also described this attack around the same time at the BSides Las Vegas conference.
Most of you will be familiar with Certificate Transparency, which is a system of public logs of certificates. Since 2018, Google Chrome requires all publicly trusted web certificates to be logged.
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