Let's Encrypt now supports ACME-CAA
@Gary
https://www.devever.net/~hl/acme-caa-live
To summarize (yes I pasted): a CAA record might point to Let’s Encrypt, but anybody could sign up at Let’s Encrypt, so this does not protect anyone. But if the CAA record points at a specific account name at Let’s Encrypt (which it can now do), this closes that hole.
This is similar to the lame delegation problem; i.e. where some old forgotten subdomain has a CNAME record pointing to some big hosting provider; although the site does not work anymore, the CNAME record is still there, and an attacker could get an account at that same big hosting provider and sign up with the same subdomain name, since the CNAME record is still valid. This way, they would get access to providing connectivity (web content, incoming e-mail) for a domain name they should not have.
https://www.devever.net/~hl/acme-caa-live
To summarize (yes I pasted): a CAA record might point to Let’s Encrypt, but anybody could sign up at Let’s Encrypt, so this does not protect anyone. But if the CAA record points at a specific account name at Let’s Encrypt (which it can now do), this closes that hole.
This is similar to the lame delegation problem; i.e. where some old forgotten subdomain has a CNAME record pointing to some big hosting provider; although the site does not work anymore, the CNAME record is still there, and an attacker could get an account at that same big hosting provider and sign up with the same subdomain name, since the CNAME record is still valid. This way, they would get access to providing connectivity (web content, incoming e-mail) for a domain name they should not have.
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@Gary If you didn't know moose were Jewish, now you know.
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