Amazon Linux AMI Security Advisory: ALAS-2017-859
Advisory Release Date: 2017-07-24 23:38 Pacific
The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered to read memory outside of the given input buffer if the passed in DNS response packet was crafted in a particular way. ( CVE-2017-1000381 )
Run yum update c-ares to update your system.