servfail-ttl 0; option in the named.conf global section is crashing the named (BIND 9.10.6)

[Nagesh Thati]

Hello,

I have added a servfail-ttl 0; parameter in the named.conf file in the
global section and restarted the named, but named is not coming up and I
don't see any errors printing in the named.log. When I do a named-checkconf
on named.conf it is giving error as UNKNOWN OPTION servfail-ttl. The
version I am using is BIND 9.10.6 stable build. Can some one help me on
this.
Thanks.

To fix this bug I have added above parameter    CVE-2018-5734: A malformed
request can trigger an assertion failure in badcache.c
<https://kb.isc.org/article/AA-01562/0/CVE-2018-5734%3A-A-malformed-request-can-trigger-an-assertion-failure-in-badcache.c.html>
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