Azure Storage Cross-Tenant Replication Disabled

ID: azure-storage-cross-tenant-replication-disabled

Severity: high

Author: princechaddha

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

Description

Ensure that the Cross-Tenant Replication feature is disabled for your Azure Storage accounts in order to prevent object replication across Microsoft Entra tenants. Cross-Tenant Replication enables replication of data across different Microsoft Entra tenants, allowing for redundancy and disaster recovery across organizational boundaries. Although advantageous for data accessibility and sharing, this feature also poses a significant security risk if not properly managed. Potential risks include unauthorized data access, data leakage, and compliance breaches.

YAML Source

id: azure-storage-cross-tenant-replication-disabled
info:
  name: Azure Storage Cross-Tenant Replication Disabled
  author: princechaddha
  severity: high
  description: |
    Ensure that the Cross-Tenant Replication feature is disabled for your Azure Storage accounts in order to prevent object replication across Microsoft Entra tenants. Cross-Tenant Replication enables replication of data across different Microsoft Entra tenants, allowing for redundancy and disaster recovery across organizational boundaries. Although advantageous for data accessibility and sharing, this feature also poses a significant security risk if not properly managed. Potential risks include unauthorized data access, data leakage, and compliance breaches.
  impact: |
    Enabled Cross-Tenant Replication can lead to unauthorized data access and data leakage, posing significant security and compliance risks.
  remediation: |
    Disable the Cross-Tenant Replication feature for Azure Storage accounts to ensure data is not replicated across different Microsoft Entra tenants without authorization.
  reference:
    - https://docs.microsoft.com/en-us/azure/storage/common/storage-redundancy
  tags: cloud,devops,azure,microsoft,storage,azure-cloud-config

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

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az storage account list --query '[*].{"Name":name}'

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

  - engine:
      - sh
      - bash
    source: |
      az storage account show --name "$name" --query 'allowCrossTenantReplication'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'false'

    extractors:
      - type: dsl
        dsl:
          - '"Cross-Tenant Replication is enabled for " + name + ", posing a security risk"'
# digest: 490a00463044022000ae1a04ecda351a200bbc28099b9ddca8bbaa6f20579cde6d31ae404b97227d02206c5b1363ed1c0f656c4a4d219af389035dbfe84597b4a1d3842a4f076a5e49ff:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "cloud/azure/storageaccounts/azure-storage-cross-tenant-replication-disabled.yaml"

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