Public Security Group Rule Sensitive Port

• Query id: 2ae9d554-23fb-4065-bfd1-fe43d5f7c419
• Query name: Public Security Group Rule Sensitive Port
• Platform: Terraform
• Severity: High
• Category: Networking and Firewall
• URL: Github

Description

A sensitive port, such as port 23 or port 110, is open to the public in either TCP or UDP protocol
Documentation

Code samples

Code samples with security vulnerabilities

Postitive 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        = "19/20"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "0.0.0.0/0"
}

Postitive test num. 2 - tf file

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

resource "alicloud_security_group_rule" "allow_all_tcp" {
  type              = "ingress"
  ip_protocol       = "udp"
  nic_type          = "internet"
  policy            = "accept"
  port_range        = "4333/4334"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "0.0.0.0/0"
}

Postitive test num. 3 - 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        = "444/445"
  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        = "1/65535"
  priority          = 1
  security_group_id = alicloud_security_group.default.id
  cidr_ip           = "0.0.0.0/0"
}