이 페이지는 아직 영어로 제공되지 않습니다. 번역 작업 중입니다. 현재 번역 프로젝트에 대한 질문이나 피드백이 있으신 경우 언제든지 연락주시기 바랍니다.
Description
Reduce the probability of a breach by checking EC2 security groups for inbound rules that allow unfettered access to TCP ports 20 and 21 (used by client/server applications for communication and file transfer) and restrict access to IP addresses that require this port.
Rationale
Malicious activity, such as spoofing, brute-force, and FTP bounce attacks, can occur when permitting unfettered access to these ports.
Remediation
From the console
Follow the Security group rules docs to learn how to add a security group rule that will restrict access to a specific port.
From the command line
Run revoke-security-group-ingress to remove inbound rules that allow unrestricted access to port 20 and 21.
