Excessive Privileges - Kubernetes
Description
Kubernetes default configuration is overly permissive, allowing users to escalate privileges or execute commands as privileged users.
Impact
Gain total control over one or more PoDs.
Recommendation
Set strict security policy disabling potentially harmful actions and restricting the user permissions.
Threat
Authenticated attacker with local access to PoD or container.
Expected Remediation Time
⌚ minutes.
Score
Default score using CVSS 3.1. It may change depending on the context of the src.
Base
- Attack vector: L
- Attack complexity: L
- Privileges required: L
- User interaction: N
- Scope: U
- Confidentiality: L
- Integrity: L
- Availability: L
Temporal
- Exploit code madurity: U
- Remediation level: O
- Report confidence: C
Result
- Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C
- Score:
- Base: 5.3
- Temporal: 4.6
- Severity:
- Base: Medium
- Temporal: Medium
Compliant code
The resource has enabled safe security policies by restricting privileges to authorized users
apiVersion: v1
kind: Pod
metadata:
name: rss-site
labels:
app: web
spec:
privileged: false
containers:
- name: front-end
image: nginx
ports:
- containerPort: 80
securityContext:
capabilities:
add:
- SYS_ADMIN
- NET_ADMIN
- name: rss-reader
image: nickchase/rss-php-nginxv1
ports:
- containerPort: 88
apiVersion: v1
kind: Pod
metadata:
name: rss-site
labels:
app: web
spec:
containers:
- name: front-end
image: nginx
ports:
- containerPort: 80
securityContext:
allowPrivilegeEscalation: false
capabilities:
drop:
- all
add:
- NET_BIND_SERVICE
- name: rss-reader
image: nickchase/rss-php-nginxv1
ports:
- containerPort: 88
Non compliant code
The resource does not enable safe security policies allowing privileged execution
apiVersion: v1
kind: Pod
metadata:
name: rss-site
labels:
app: web
spec:
privileged: true
containers:
- name: front-end
image: nginx
ports:
- containerPort: 80
securityContext:
capabilities:
add:
- SYS_ADMIN
- NET_ADMIN
- name: rss-reader
image: nickchase/rss-php-nginxv1
ports:
- containerPort: 88
apiVersion: v1
kind: Pod
metadata:
name: rss-site
labels:
app: web
spec:
containers:
- name: front-end
image: nginx
ports:
- containerPort: 80
securityContext:
allowPrivilegeEscalation: true
capabilities:
drop:
- all
add:
- NET_BIND_SERVICE
- name: rss-reader
image: nickchase/rss-php-nginxv1
ports:
- containerPort: 88
Details
https://kubernetes.io/docs/concepts/security/pod-security-standards/#restricted https://kubernetes.io/docs/concepts/policy/pod-security-policy/
Requirements
- 095.Define users with privileges
- 096.Set user's required privileges
- 186.Use the principle of least privilege
Fixes
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