Review Network Interfaces with IP Forwarding Enabled

ID: azure-nic-ip-forwarding-check

Severity: medium

Author: princechaddha

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

Description

Ensure that all Microsoft Azure network interfaces (NICs) with IP forwarding enabled are regularly reviewed for security and compliance reasons. IP forwarding allows a virtual machine (VM) to receive and send network traffic not intended for its own IP, used primarily by network virtual appliances.

YAML Source

id: azure-nic-ip-forwarding-check
info:
  name: Review Network Interfaces with IP Forwarding Enabled
  author: princechaddha
  severity: medium
  description: |
    Ensure that all Microsoft Azure network interfaces (NICs) with IP forwarding enabled are regularly reviewed for security and compliance reasons. IP forwarding allows a virtual machine (VM) to receive and send network traffic not intended for its own IP, used primarily by network virtual appliances.
  impact: |
    If improperly managed, IP forwarding can expose Azure environments to security risks, potentially allowing traffic redirection or eavesdropping.
  remediation: |
    Regularly review and validate the necessity of IP forwarding settings on Azure NICs. Ensure that only authorized and secure virtual appliances use this feature.
  reference:
    - https://docs.microsoft.com/en-us/azure/virtual-network/ip-forwarding
  tags: cloud,devops,azure,microsoft,nic,azure-cloud-config

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

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

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

  - engine:
      - sh
      - bash
    source: |
      az network nic show --name $name --resource-group $resourcegroup --query 'enableIpForwarding'

    matchers:
      - type: word
        words:
          - "true"

    extractors:
      - type: dsl
        dsl:
          - 'nsg + " has IP forwarding enabled"'
# digest: 4a0a00473045022021768b135f06b2e0d87a21813b342d9810fcaff64413d343ca0b87eb526431be022100e9d988d5904aac0d77876658244eb44191ed5946e1dba3e4e59d4ba36fd72ca1:922c64590222798bb761d5b6d8e72950

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/network/azure-nic-ip-forwarding-check.yaml"

View on Github