Reduce the probability of a breach by checking EC2 security groups for inbound rules that allow unfettered access to host using the Internet Control Message Protocol (ICMP), a protocol commonly used to troubleshoot TCP/IP networks and deliver IP packets, and restrict access.
Rationale
Malicious activity, such as denial-of-service (DoS) attacks and Smurf/Fraggle attacks, can occur when permitting unfettered access to this port.
Remediation
From the console
Follow the Security group rules docs to learn how to restrict access to host using the ICMP.
From the command line
Run describe-security-groups with a filter to expose security groups that allow access to host using ICMP.
