bind9: CVE-2017-3139 affects debian too

[Vladislav Kurz <vladislav.kurz@webstep.net>]

Hello LTS team,

please have a look at 
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=889285

I think it is the same bug as CVE-2017-3139 which was considered to affect 
only RedHat, but it seems to affect debian wheezy too.

Please check if it is possible to apply the same fixes as RedHat did.
Or at leas update the bind package in wheezy-backports to match the 
version and security fixes from debian jesssie.

Thank you very much for maintaining Debian LTS

Best Regards
Vladislav Kurz