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VPC security group rule permits ingress from '0.0.0.0/0' to port 23 (Telnet) Affecting VPC service in AWS

Severity

0.0
medium
0
10
Severity Framework
Snyk CCSS
Rule category
Network/ Ports

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Frameworks
CIS-ControlsCSA-CCMISO-27001NIST-800-53PCI-DSSSOC-2
  • Snyk IDSNYK-CC-00157
  • creditSnyk Research Team
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Description

Removing unfettered connectivity to remote console services reduces a server's exposure to risk.

How to fix?

Set the ingress.cidr_blocks attribute with a more restrictive CIDR block, for example 192.168.1.0/24.

Example configuration:

resource "aws_security_group" "allow_some_cidr_valid" {
  name        = "allow_some_cidr_valid"
  description = "Allow from valid CIDR"

  ingress {
    from_port   = 23
    to_port     = 23
    protocol    = "tcp"
    cidr_blocks = ["192.168.1.0/24"]
  }
}