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Id: 4849211b-ac39-479e-ae78-5694d506cb24
Cloud Provider: aws
Framework: Terraform
Severity: Info
Category: Access Control
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Description
This check ensures that AWS load balancers are associated with appropriate security groups, which control network traffic to and from the resource. When the security_groups
attribute is omitted from an aws_lb
resource, as shown below, the load balancer may become exposed to unrestricted network access, increasing the risk of unauthorized access or attacks:
resource "aws_lb" "test" {
name = "test"
load_balancer_type = "application"
subnets = [aws_subnet.subnet1.id, aws_subnet.subnet2.id]
internal = true
}
By explicitly defining security_groups
, you can restrict inbound and outbound traffic to only trusted sources:
resource "aws_lb" "test" {
name = "test"
load_balancer_type = "application"
subnets = [aws_subnet.subnet1.id, aws_subnet.subnet2.id]
internal = true
security_groups = [aws_security_group.allow_tls.id]
}
Compliant Code Examples
# given:
# - used security group
# - aws_instance
# when:
# - used security group attached to aws_instance
# then:
# - do not detect any unused security group
resource "aws_security_group" "used_sg" {
name = "used-sg"
description = "Used security group"
vpc_id = aws_vpc.main.id
ingress {
description = "Some port"
from_port = 43
to_port = 43
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
}
resource "aws_instance" "negative3" {
ami = "ami-003634241a8fcdec0"
instance_type = "t2.micro"
vpc_security_group_ids = [ "aws_security_group.used_sg.id" ]
}
resource "aws_security_group" "allow_tls" {
name = "allow_tls"
description = "Allow TLS inbound traffic"
vpc_id = aws_vpc.main.id
ingress {
description = "TLS from VPC"
from_port = 443
to_port = 443
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
tags = {
Name = "allow_tls"
}
}
module "security_groups_test" {
source = "terraform-aws-modules/security-group/aws//modules/http-80"
version = "4.3.0"
name = "web-server"
security_group_id = aws_security_group.allow_tls.id
}
resource "aws_security_group" "example" {
name = "example"
description = "Allow Redis traffic"
vpc_id = data.aws_vpc.selected.id
ingress {
from_port = 6379
to_port = 6379
protocol = "tcp"
cidr_blocks = [data.aws_vpc.selected.cidr_block]
}
}
resource "aws_elasticache_replication_group" "redis" {
replication_group_id = "Example"
parameter_group_name = "default.redis6.x"
engine = "redis"
engine_version = "6.x"
automatic_failover_enabled = false
security_group_ids = [aws_security_group.example.id]
}
Non-Compliant Code Examples
# given:
# - unused security group
# - aws_instance
# when:
# - no security group attached to aws_instance
# then:
# - detect unused security group as unused
resource "aws_instance" "positive1" {
ami = "ami-003634241a8fcdec0"
instance_type = "t2.micro"
}
resource "aws_security_group" "unused-sg" {
name = "unused-sg"
description = "Unused security group"
vpc_id = aws_vpc.main.id
ingress {
description = "Some port"
from_port = 42
to_port = 42
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
}
# given:
# - unused security group
# - used security group
# - aws_instance
# when:
# - used security group attached to aws_instance
# - unused security group not attached to aws_instance
# then:
# - detect only unused security group as unused
resource "aws_instance" "positive1" {
ami = "ami-003634241a8fcdec0"
instance_type = "t2.micro"
vpc_security_group_ids = [ aws_security_group.used_sg.id ]
}
resource "aws_security_group" "unused_sg" {
name = "unused-sg"
description = "Unused security group"
vpc_id = aws_vpc.main.id
ingress {
description = "Some port"
from_port = 42
to_port = 42
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
}
resource "aws_security_group" "used_sg" {
name = "used-sg"
description = "Used security group"
vpc_id = aws_vpc.main.id
ingress {
description = "Some port"
from_port = 43
to_port = 43
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
}
# given:
# - unused security group
# - used security group
# - aws_eks_cluster
# when:
# - used security group attached to aws_eks_cluster
# - unused security group not attached to aws_eks_cluster
# then:
# - detect only unused security group as unused
resource "aws_eks_cluster" "positive4" {
name = "beautiful-eks"
role_arn = aws_iam_role.example.arn
vpc_config {
security_group_ids = [ aws_security_group.used_sg.id ]
}
}
resource "aws_security_group" "unused_sg" {
name = "unused-sg"
description = "Unused security group"
vpc_id = aws_vpc.main.id
ingress {
description = "Some port"
from_port = 42
to_port = 42
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
}
resource "aws_security_group" "used_sg" {
name = "used-sg"
description = "Used security group"
vpc_id = aws_vpc.main.id
ingress {
description = "Some port"
from_port = 43
to_port = 43
protocol = "tcp"
cidr_blocks = [aws_vpc.main.cidr_block]
ipv6_cidr_blocks = [aws_vpc.main.ipv6_cidr_block]
}
egress {
from_port = 0
to_port = 0
protocol = "-1"
cidr_blocks = ["0.0.0.0/0"]
ipv6_cidr_blocks = ["::/0"]
}
}