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. Maintained by Hanno Böck.
29 April 2021
On April 23, well-known security researcher Dan Kaminsky passed away. Kaminsky was most famously known for finding security flaws in the Domain Name System (DNS), but he also discovered flaws in the TLS certificate infrastructure and X.509.
In a talk Kaminsky gave in 2009 at several conferences (a recording is available from CCC), he presented an issue with MD2 hashes. Back then, a certificate from Verisign was listed in certificate root stores that had a self-signature with an MD2 hash.
With a preimage attack on MD2, this could theoretically have allowed for creating an intermediate certificate that has the same hash and is signed by that root. A theoretical preimage attack against MD2 had been known since 2008, with a complexity of 2^73. This is an impractical attack, but it comes close to what is practically breakable.Read More
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