Container is running with writable root filesystem Affecting Deployment service in Kubernetes
Severity Framework
CCSS (Common Configuration Scoring System) is a set of measures used to determine the severity of the rule.
Snyk CCSS
Rule category
Each rule is associated with a high-level category. For example IAM, Container, Monitoring, Logging, Network, etc.
Containers/ Configuration
Is your environment affected by this misconfiguration?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsFrameworks
CIS-Controls
- Snyk IDSNYK-CC-00612
- creditSnyk Research Team
Description
Compromised process could abuse writable root filesystem to elevate privileges.
How to fix?
Set securityContext.readOnlyRootFilesystem to true.
Set security_context.read_only_root_filesystem to true.
Example Configuration
resource "kubernetes_pod" "allowed" {
metadata {
name = "terraform-example612"
}
spec {
container {
image = "nginx:1.7.9"
name = "example612"
security_context {
read_only_root_filesystem = true
}
}
dns_config {
nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
searches = ["example.com"]
}
dns_policy = "None"
}
}
resource "kubernetes_cron_job" "cron_allowed_1" {
metadata {
name = "demo"
}
spec {
concurrency_policy = "Replace"
failed_jobs_history_limit = 5
schedule = "1 0 * * *"
starting_deadline_seconds = 10
successful_jobs_history_limit = 10
job_template {
metadata {}
spec {
backoff_limit = 2
ttl_seconds_after_finished = 10
template {
metadata {}
spec {
container {
name = "hello"
image = "busybox"
security_context {
read_only_root_filesystem = true
}
command = ["/bin/sh", "-c", "date; echo Hello from the Kubernetes cluster"]
}
}
}
}
}
}
}