Public Security Group Rule Unknown Port

• Query id: dd706080-b7a8-47dc-81fb-3e8184430ec0
• Query name: Public Security Group Rule Unknown Port
• Platform: Terraform
• Severity: Medium
• Category: Networking and Firewall
• URL: Github

Description

A unknown port, such as port 24 or port 111, is open to the public in either TCP or UDP or ALL protocol/protocols mentioned
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - tf file

resource "alicloud_security_group" "default" {
  name = "default"
}

resource "alicloud_security_group_rule" "allow_all_tcp" {
  type              = "ingress"
  ip_protocol       = "tcp"
  nic_type          = "internet"
  policy            = "accept"
  port_range        = "54/60"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "0.0.0.0/0"
}

Positive test num. 2 - tf file

resource "alicloud_security_group" "default" {
  name = "default"
}

resource "alicloud_security_group_rule" "allow_all_tcp" {
  type              = "ingress"
  ip_protocol       = "all"
  nic_type          = "internet"
  policy            = "accept"
  port_range        = "-1/-1"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "0.0.0.0/0"
}

Code samples without security vulnerabilities

Negative test num. 1 - tf file

resource "alicloud_security_group" "default" {
  name = "default"
}

resource "alicloud_security_group_rule" "allow_all_tcp" {
  type              = "ingress"
  ip_protocol       = "tcp"
  nic_type          = "internet"
  policy            = "accept"
  port_range        = "1/65535"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "10.159.6.18/12"
}

Negative test num. 2 - tf file

resource "alicloud_security_group" "default" {
  name = "default"
}

resource "alicloud_security_group_rule" "allow_all_tcp" {
  type              = "ingress"
  ip_protocol       = "icmp"
  nic_type          = "internet"
  policy            = "accept"
  port_range        = "-1/-1"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "10.159.6.18/12"
}