Amazon Linux AMI : kernel (ALAS-2018-1049)
High Nessus Plugin ID 111553
SynopsisThe remote Amazon Linux AMI host is missing a security update.
DescriptionLinux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. An attacker can induce a denial of service condition by sending specially modified packets within ongoing TCP sessions. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port. Thus, the attacks cannot be performed using spoofed IP addresses. ( https://www.kb.cert.org/vuls/id/962459 )
SolutionRun 'yum update kernel' and reboot your instance to update your system.