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Azure VMSS Instance Termination Notifications Disabled

ID: azure-vmss-termination-notif-disabled

Severity: medium

Author: princechaddha

Tags: cloud,devops,azure,microsoft,vmss,azure-cloud-config

Description

Section titled “Description”

Ensure that your Microsoft Azure virtual machine scale sets are configured to receive instance termination notifications through the Azure Metadata service and have a predefined delay timeout configured for the “Terminate” operation (event). The termination notifications are delivered through Scheduled Events, an Azure Metadata feature which sends termination notifications, and can also be used to delay impactful operations such as reboots and redeployments. The delay associated with the “Terminate” event will depend on the delay limit specified in the VM scale set model configuration.

YAML Source

Section titled “YAML Source”
id: azure-vmss-termination-notif-disabled
info:
  name: Azure VMSS Instance Termination Notifications Disabled
  author: princechaddha
  severity: medium
  description: |
    Ensure that your Microsoft Azure virtual machine scale sets are configured to receive instance termination notifications through the Azure Metadata service and have a predefined delay timeout configured for the "Terminate" operation (event). The termination notifications are delivered through Scheduled Events, an Azure Metadata feature which sends termination notifications, and can also be used to delay impactful operations such as reboots and redeployments. The delay associated with the "Terminate" event will depend on the delay limit specified in the VM scale set model configuration.
  impact: |
    Failing to enable instance termination notifications can lead to insufficient preparation time for termination events, potentially disrupting operations and leading to data loss.
  remediation: |
    Configure the termination notification feature for all your Azure VM scale sets to receive proper alerts and set a reasonable delay for the termination events.
  reference:
    - https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-terminate-notification
  tags: cloud,devops,azure,microsoft,vmss,azure-cloud-config


flow: |
  code(1);
  for (let ScaleSetData of iterate(template.scaleSetList)) {
    ScaleSetData = JSON.parse(ScaleSetData);
    set("name", ScaleSetData.name);
    set("resourceGroup", ScaleSetData.resourceGroup);
    code(2);
  }


self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az vmss list --output json --query '[*].{"name":name,"resourceGroup":resourceGroup}'


    extractors:
      - type: json
        name: scaleSetList
        internal: true
        json:
          - '.[]'


  - engine:
      - sh
      - bash
    source: |
      az vmss show --name "$name" --resource-group "$resourceGroup" --query '{"TerminateNotificationProfileStatus": virtualMachineProfile.scheduledEventsProfile.terminateNotificationProfile.enable}'


    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"TerminateNotificationProfileStatus": null'


    extractors:
      - type: dsl
        dsl:
          - 'name + " in " + resourceGroup + " does not have termination notifications enabled."'
# digest: 4b0a00483046022100927c281002aa7b9e2c00d00e63c8e074deddad50548b0ae15b7a46203529703f022100bc9c7a7b81bb4f84c5d3a802f02c72464998d77fd45e804c99cfa118a5733f23:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "cloud/azure/virtualmachines/azure-vmss-termination-notif-disabled.yaml"

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