Images are not selected using a digest misconfiguration detected in code

Rule Details

Cortex AppSec Rule ID	APPSEC_K8S_43
Category - Subcategory	Kubernetes - Resource Management
Provider	OTHER
Severity	LOW
Framework	Helm, Kubernetes, Kustomize, Terraform, Terraform Plan

Impact

In some cases you may prefer to use a fixed version of an image, rather than update to newer versions. Docker enables you to pull an image by its digest, specifying exactly which version of an image to pull. Pulling using a digest allows you to "pin" an image to that version, and guarantee that the image you're using is always the same. Digests also prevent race-conditions; if a new image is pushed while a deploy is in progress, different nodes may be pulling the images at different times, so some nodes have the new image, and some have the old one. Services automatically resolve tags to digests, so you don't need to manually specify a digest.

How to Fix

Resource: image

• Arguments: digest [source,go]

---

apiVersion: v1 kind: Pod metadata: name: spec: containers:

• name: image: image@sha256:45b23dee08af5e43a7fea6c4cf9c25ccf269ee113168c19722f87876677c5cb2

---

{ "creator": 7, "id": 2110, "image_id": null, "images": [ { "architecture": "amd64", "features": "", "variant": null,

• "digest": "sha256:1ae98b2c895d1ceeba8913ff79f422f005b7f967a311da520a88ac89180b4c39", "os": "linux", "os_features": "", "os_version": null, "size": 87342331 } ], "last_updated": "2017-04-06T20:16:24.015937Z", "last_updater": 2215, "last_updater_username": "stackbrew", "name": "centos5", "repository": 54, "full_size": 87342331, "v2": true }

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