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Id: terraform-kubernetes-volume-mount-with-os-directory-write-permissions
Provider: Kubernetes
Platform: Terraform
Severity: High
Category: Resource Management
Learn More Description Containers can mount sensitive host folders, which may grant dangerous access to critical host configurations and binaries. This rule inspects container and init_container entries in the resource spec and evaluates each volume_mount (object or array) whose mount_path targets host-sensitive directories or /. The rule enforces that the read_only attribute is set to true. It reports a MissingAttribute if read_only is undefined, and an IncorrectValue if it is explicitly set to false. To remediate, add read_only = true when missing or replace false with true for incorrect values.
Compliant Code Examples resource "kubernetes_pod" "testttt" {
metadata {
name = "terraform-example"
}
spec {
container {
volume_mount {
name = "config-volume"
mount_path = "/etc/config"
read_only = true
}
image = "nginx:1.7.9"
name = "example"
env {
name = "environment"
value = "test"
}
port {
container_port = 8080
}
liveness_probe {
http_get {
path = "/nginx_status"
port = 80
http_header {
name = "X-Custom-Header"
value = "Awesome"
}
}
initial_delay_seconds = 3
period_seconds = 3
}
}
dns_config {
nameservers = [ "1.1.1.1" , "8.8.8.8" , "9.9.9.9" ]
searches = [ "example.com" ]
option {
name = "ndots"
value = 1
}
option {
name = "use-vc"
}
}
dns_policy = "None"
}
}
Non-Compliant Code Examples resource "kubernetes_pod" "test" {
metadata {
name = "terraform-example"
}
spec {
container {
volume_mount {
name = "config-volume"
mount_path = "/bin"
}
image = "nginx:1.7.9"
name = "example"
env {
name = "environment"
value = "test"
}
port {
container_port = 8080
}
liveness_probe {
http_get {
path = "/nginx_status"
port = 80
http_header {
name = "X-Custom-Header"
value = "Awesome"
}
}
initial_delay_seconds = 3
period_seconds = 3
}
}
dns_config {
nameservers = [ "1.1.1.1" , "8.8.8.8" , "9.9.9.9" ]
searches = [ "example.com" ]
option {
name = "ndots"
value = 1
}
option {
name = "use-vc"
}
}
dns_policy = "None"
}
}
resource "kubernetes_pod" "test2" {
metadata {
name = "terraform-example"
}
spec {
container {
volume_mount {
name = "config-volume"
mount_path = "/bin"
read_only = false
}
image = "nginx:1.7.9"
name = "example"
env {
name = "environment"
value = "test"
}
port {
container_port = 8080
}
liveness_probe {
http_get {
path = "/nginx_status"
port = 80
http_header {
name = "X-Custom-Header"
value = "Awesome"
}
}
initial_delay_seconds = 3
period_seconds = 3
}
}
dns_config {
nameservers = [ "1.1.1.1" , "8.8.8.8" , "9.9.9.9" ]
searches = [ "example.com" ]
option {
name = "ndots"
value = 1
}
option {
name = "use-vc"
}
}
dns_policy = "None"
}
}
resource "kubernetes_pod" "test3" {
metadata {
name = "terraform-example"
}
spec {
container {
volume_mount = [
{
name = "config-volume"
mount_path = "/bin"
read_only = false
}
]
image = "nginx:1.7.9"
name = "example"
env {
name = "environment"
value = "test"
}
port {
container_port = 8080
}
liveness_probe {
http_get {
path = "/nginx_status"
port = 80
http_header {
name = "X-Custom-Header"
value = "Awesome"
}
}
initial_delay_seconds = 3
period_seconds = 3
}
}
dns_config {
nameservers = [ "1.1.1.1" , "8.8.8.8" , "9.9.9.9" ]
searches = [ "example.com" ]
option {
name = "ndots"
value = 1
}
option {
name = "use-vc"
}
}
dns_policy = "None"
}
}
