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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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89

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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Recent Issues


  • #88 Two zeros bypass Java’s ECDSA signature check 28 Apr 2022
  • #87 Russia creates certificate authority in response to sanctions 31 Mar 2022
  • #86 EU plans to mandate less secure certificates in browsers 28 Feb 2022
  • #85 WebTransport allows TLS connections with certificate hash 27 Jan 2022
  • #84 RFC 9155 deprecates MD5 and SHA-1 signatures in TLS handshake messages 30 Dec 2021
  • #83 Post-Quantum Signatures in TLS will be challenging 30 Nov 2021
  • #82 Expiration of DST Root CA causes problems with Let’s Encrypt certificates 28 Oct 2021
  • #81 HTTPS Everywhere plug-in no longer needed 30 Sep 2021
  • #80 Vulnerabilities show fragility of STARTTLS 31 Aug 2021
  • #79 The end of FTP in browsers 30 Jul 2021
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