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Supply Chain Attack - Kubernetes

Description​

Kubernetes dependencies are not pinned to an exact digest, making the docker build unable the verify the integrity of the image and allowing a malicious actor to override the used components with malicious components without leaving a trace.

Impact​

Override dependencies or component with malicious content.

Recommendation​

Use mechanisms such as git-commits, or artifacts and hashes to verify the data integrity.

Threat​

Anonymous attacker from Internet with write access to the provider releases.

Expected Remediation Time​

⌚ 15 minutes.

Score​

Default score using CVSS 3.1. It may change depending on the context of the src.

Base​

  • Attack vector: N
  • Attack complexity: H
  • Privileges required: N
  • User interaction: R
  • Scope: U
  • Confidentiality: N
  • Integrity: L
  • Availability: N

Temporal​

  • Exploit code maturity: U
  • Remediation level: O
  • Report confidence: R

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N/E:U/RL:O/RC:R
  • Score:
    • Base: 3.1
    • Temporal: 2.6
  • Severity:
    • Base: Low
    • Temporal: Low

Score 4.0​

Default score using CVSS 4.0 . It may change depending on the context of the src.

Base 4.0​

  • Attack vector: N
  • Attack complexity: H
  • Attack Requirements: N
  • Privileges required: N
  • User interaction: P
  • Confidentiality (VC): N
  • Integrity (VI): L
  • Availability (VA): N
  • Confidentiality (SC): N
  • Integrity (SI): N
  • Availability (SA): N

Threat 4.0​

  • Exploit maturity: U

Result 4.0​

  • Vector string: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
  • Score:
    • CVSS-BT: 0.6
  • Severity:
    • CVSS-BT: Low

Compliant code​

All docker dependencies are pinned using secure mechanisms

apiVersion: v1
kind: Pod
metadata:
  name: <Pod name>
spec:
  containers:
  - name: <container name>
    image: ubuntu@sha256:45b23dee08af5e43a7fea6c4cf9c25ccf269ee113168c19722f87876677c5cb2

Non compliant code​

There are docker dependencies not pinned

apiVersion: v1
kind: Pod
metadata:
  name: <Pod name>
spec:
  containers:
  - name: <container name>
    image: ubuntu

Requirements​

Fixes​

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