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Letsencrypt IMPORTANT: What you need to know about TLS-SNI validation issues

Discussion in 'Domains, DNS, Email & SSL Certificates' started by buik, Jan 19, 2018.

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  1. buik

    buik “It always seems impossible until it’s done.” Premium Member

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    On 2018-01-09 we got a report from Frans Rosén of Detectify that one of our three validation methods, TLS-SNI-01, could be used to get certificates for domains you don’t own, if those domains were hosted on software that allowed upload of arbitrary certificates. We immediately disabled TLS-SNI-01. Initially we thought this would be a temporary measure, but we later learned that a lot of hosting software has this issue............

    IMPORTANT: What you need to know about TLS-SNI validation issues
     
  2. eva2000

    eva2000 Administrator Staff Member

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    Yeah read that news a while back. Doesn't affect Centmin Mod's addons/acmetool.sh and acme.sh client as we use web root authentication and DNS authentication methods (HTTP-01 or DNS-01). But thanks for heads up !