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VPC network ACL allows ingress from 0.0.0.0/0 to port 3389 Affecting VPC service in AWS

Severity

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

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    Frameworks
    CIS-AWS CIS-Controls CSA-CCM ISO-27001 NIST-800-53 PCI-DSS SOC-2
  • Snyk ID SNYK-CC-00152
  • credit Snyk Research Team
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Description

Public access to remote server administration ports, such as 22 and 3389, increases resource attack surface and unnecessarily raises the risk of resource compromise.

How to fix?

Remove any invalid ingress rule from the aws_network_acl.

An ingress rule is invalid if it contains all of the following:

Example Configuration

resource "aws_network_acl" "nacl1" {
  vpc_id = "${aws_vpc.vpc1.id}"

  subnet_ids = ["${aws_subnet.subnet1.id}"]
}

# Standalone rule
resource "aws_network_acl_rule" "rule1" {
  network_acl_id = "${aws_network_acl.nacl1.id}"
  rule_number = 10
  protocol = "tcp"
  rule_action = "allow"
  cidr_block = "192.16.0.0/24"
  from_port = 3389
  to_port = 3389
}

# Inline rule
resource "aws_network_acl" "nacl2_inline" {
  vpc_id = "${aws_vpc.vpc1.id}"

  subnet_ids = ["${aws_subnet.subnet2.id}"]

  ingress {
    protocol = "tcp"
    rule_no = 20
    action = "allow"
    cidr_block = "192.16.0.0/24"
    from_port = 3389
    to_port = 3389
  }
}