Amazon Linux AMI Security Advisory: ALAS-2018-1098
Advisory Release Date: 2018-11-01 23:45 Pacific
During key agreement in a TLS handshake using a DH(E) based ciphersuite a malicious server can send a very large prime value to the client. This will cause the client to spend an unreasonably long period of time generating a key for this prime resulting in a hang until the client has finished. This could be exploited in a Denial Of Service attack.(CVE-2018-0732 )
Run yum update openssl to update your system.