Bug#835476: Firefox and HTTPS: Green padlock in spite of "Could not verify this certificate ..."

[Christian Schneider]

Package: firefox-esr
Version: 45.3.0esr-1~deb7u1

(Debian wheezy, amd64)

Hi all,

visiting the website https://kis.hosteurope.de/, firefox sometimes shows 
a green padlock next to the URL, but no owner information (which should 
be displayed for this website).  In this case, the certificate viewer 
even claims "Could not verify this certificate because the issuer is 
unknown." in spite of the green padlock.

Reloading the website only sometimes reproduces this behaviour, while in 
other cases the green padlock plus owner information is displayed (as 
expected) and the certificate viewer does not show any errors/problems.

The certificate provided by the website is always the same (comparing 
its fingerprint), independently of which case occurs.

Please find attached some screenshots.

Thank you very much.

Best regards,
Christian Schneider
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