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AWS default network ACL allows public access Affecting VPC service in AWS

Severity

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

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Frameworks
CIS-ControlsCSA-CCMISO-27001NIST-800-53PCI-DSSSOC-2
  • Snyk IDSNYK-CC-00317
  • creditSnyk Research Team
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Description

Inbound traffic is allowed to a resource from any source instead of a restricted range, and potentially everyone can access your resource.

How to fix?

Set ingress.cidr_block to specific CIDR block range only, e.g. 192.168.1.0/24.

Example Configuration

resource "aws_default_network_acl" "default" {
  default_network_acl_id = aws_vpc.mainvpc.default_network_acl_id

  ingress {
    protocol   = -1
    rule_no    = 100
    action     = "allow"
    cidr_block = "192.168.1.0/24"
    from_port  = 0
    to_port    = 0
  }

  egress {
    protocol   = -1
    rule_no    = 100
    action     = "allow"
    cidr_block = "0.0.0.0/0"
    from_port  = 0
    to_port    = 0
  }
}