Amazon Linux AMI Security Advisory: ALAS-2020-1373
Advisory Release Date: 2020-06-03 17:22 Pacific
A network amplification vulnerability was found in Unbound, in the way it processes delegation messages from one authoritative zone to another. This flaw allows an attacker to cause a denial of service or be part of an attack against another DNS server when Unbound is deployed as a recursive resolver or authoritative name server.(CVE-2020-12662 )
Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.(CVE-2020-12663 )
Run yum update unbound to update your system.