Amazon Linux AMI Security Advisory: ALAS-2017-858
Advisory Release Date: 2017-07-24 23:16 Pacific
Security Fix(es): A flaw was found in the way BIND handled TSIG authentication for dynamic updates. A remote attacker able to communicate with an authoritative BIND server could use this flaw to manipulate the contents of a zone, by forging a valid TSIG or SIG(0) signature for a dynamic update request. A flaw was found in the way BIND handled TSIG authentication of AXFR requests. A remote attacker, able to communicate with an authoritative BIND server, could use this flaw to view the entire contents of a zone by sending a specially constructed request packet. (CVE-2017-3142 , CVE-2017-3143 )
Run yum update bind to update your system.