SSL Firefox connect to wrong IP for HTTP/2 + IPv6 with SSL wildcard certificates

eva2000 · 2018-02-16

Interesting bug in Firefox web browser when using HTTP/2 HTTPS and IPv6 with SSL wildcard certificates is outlined at Firefox HTTP/2 & IPv6: Webserver Subdomain Configuration Pitfall – Matthias P. Würfl Conditions two (or more) subdomains (same...

Discussion in 'Domains, DNS, Email & SSL Certificates' started by eva2000, Feb 16, 2018.

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Feb 16, 2018 #1
eva2000 Administrator Staff Member

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Interesting bug in Firefox web browser when using HTTP/2 HTTPS and IPv6 with SSL wildcard certificates is outlined at Firefox HTTP/2 & IPv6: Webserver Subdomain Configuration Pitfall – Matthias P. Würfl

Conditions

two (or more) subdomains (same domain)

…share a common wildcard ssl certificate

on the same host (same IPv4-address)

but with different IPv6-addresses

client: Firefox (only Firefox has this behavior)

use HTTP/2

use IPv6

Expected behavior:

foo.example.com in location bar shows foo.example.com

bar.example.com in location bar shows bar.example.com

Seen behavior
Requests for the second host (bar) go to the first host (foo).
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SSL Firefox connect to wrong IP for HTTP/2 + IPv6 with SSL wildcard certificates

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