Network misconfigurations

AWS EC2 instance allows public ingress access on TELNET port 23

Risk Level

Hazardous (3)

Platform(s)
Compliance Frameworks

Description

TELNET port - 23 is used to gain CLI access to the machines. Allowing inbound traffic from all external IP addresses to TELNET port is vulnerable to communication sniffing, brute force attack and DoS attacks. It is a best practice to restrict access from specific IP addresses to port 23.
  • Recommended Mitigation

    It is recommended to replace the source IP of the rule with a specific IP address or delete the rule.