​
Event Information

  • The Microsoft.Network.publicIPAddresses.write event in Azure for AzureNetwork refers to the action of creating or updating a public IP address resource within the Azure Network.
  • This event indicates that a change has been made to the public IP address configuration, such as assigning a new IP address or modifying the settings of an existing IP address.
  • It is important to monitor this event as it can help track any changes made to the public IP addresses associated with the Azure Network, ensuring proper management and security of network resources.

​
Examples

  1. Unauthorized modification of public IP addresses: If security is impacted with Microsoft.Network.publicIPAddresses.write in Azure for AzureNetwork, it could potentially allow unauthorized users to modify the public IP addresses associated with the Azure Network. This could lead to unauthorized access to resources or services hosted on the network.

  2. IP address spoofing: Another security impact could be IP address spoofing, where an attacker could use the Microsoft.Network.publicIPAddresses.write permission to modify the public IP addresses associated with the Azure Network. This could allow them to impersonate legitimate IP addresses and potentially bypass security controls or gain unauthorized access to resources.

  3. Denial of Service (DoS) attacks: By modifying the public IP addresses using the Microsoft.Network.publicIPAddresses.write permission, an attacker could potentially launch DoS attacks against the Azure Network. They could change the IP addresses associated with critical resources, causing disruption or rendering them inaccessible to legitimate users.

It is important to closely monitor and restrict the permissions granted for managing public IP addresses in Azure to mitigate these security risks. Regularly reviewing and auditing the permissions assigned to users or roles is crucial to maintaining a secure Azure environment.

​
Remediation

​
Using Console

To remediate the issues mentioned in the previous response for Azure Network using the Azure console, you can follow these step-by-step instructions:

  1. Enable Network Security Groups (NSGs):

    • Go to the Azure portal and navigate to the desired Azure Network.
    • Select the “Network security groups” option from the left-hand menu.
    • Click on the “Add” button to create a new NSG or select an existing NSG.
    • Configure the NSG rules to allow only necessary inbound and outbound traffic.
    • Apply the NSG to the desired subnets or network interfaces.

  2. Implement Azure DDoS Protection Standard:

    • Go to the Azure portal and navigate to the desired Azure Network.
    • Select the “Distributed denial of service (DDoS) protection” option from the left-hand menu.
    • Click on the “Enable DDoS protection” button.
    • Choose the “Standard” tier for enhanced protection.
    • Configure the DDoS protection settings based on your requirements.
    • Apply the DDoS protection to the desired resources within the network.

  3. Implement Azure Firewall:

    • Go to the Azure portal and navigate to the desired Azure Network.
    • Select the “Azure Firewall” option from the left-hand menu.
    • Click on the “Add” button to create a new Azure Firewall or select an existing one.
    • Configure the firewall rules to allow or deny traffic based on your network security policies.
    • Associate the Azure Firewall with the desired subnets or network interfaces.
    • Monitor and manage the Azure Firewall to ensure effective network security.

Note: The above instructions provide a general guideline for remediating the mentioned issues in Azure Network using the Azure console. The specific steps may vary depending on your Azure subscription, network configuration, and security requirements. It is recommended to refer to the official Azure documentation for detailed instructions and best practices.

​
Using CLI

To remediate issues related to Azure Network using Azure CLI, you can use the following commands:

  1. Example 1: Enable Network Security Group (NSG) Flow Logs

    • Command: az network watcher flow-log configure
    • Description: This command enables flow logs for a specific NSG, allowing you to capture and analyze network traffic.
    • Parameters: You need to provide the resource group name, NSG name, storage account ID, and storage account key.

  2. Example 2: Restrict Network Access using Network Security Groups (NSGs)

    • Command: az network nsg rule create
    • Description: This command creates a new rule in an NSG to restrict network access based on specific criteria.
    • Parameters: You need to provide the resource group name, NSG name, rule name, priority, source/destination IP addresses, ports, and action.

  3. Example 3: Enable Azure DDoS Protection Standard

    • Command: az network ddos-protection update
    • Description: This command enables Azure DDoS Protection Standard for a specific virtual network, providing protection against DDoS attacks.
    • Parameters: You need to provide the resource group name and virtual network name.

Note: The provided commands are examples and may require additional parameters based on your specific requirements. Make sure to refer to the official Azure CLI documentation for detailed usage and options.

​
Using Python

To remediate issues related to AzureNetwork using Python, you can use the Azure SDK for Python. Here are three examples of how you can remediate common issues:

  1. Example 1: Enable Network Security Group (NSG) Flow Logs

    • Use the azure.mgmt.network package to retrieve the NSG resource.
    • Enable flow logs for the NSG by setting the enable_flow_logs property to True.
    • Update the NSG resource using the network_client.network_security_groups.create_or_update method.
    from azure.identity import DefaultAzureCredential
from azure.mgmt.network import NetworkManagementClient

# Authenticate using default credentials
credential = DefaultAzureCredential()
network_client = NetworkManagementClient(credential, subscription_id)

# Retrieve the NSG resource
nsg = network_client.network_security_groups.get(resource_group_name, nsg_name)

# Enable flow logs for the NSG
nsg.enable_flow_logs = True

# Update the NSG resource
network_client.network_security_groups.create_or_update(resource_group_name, nsg_name, nsg)

  2. Example 2: Add a Network Security Rule to an NSG

    • Use the azure.mgmt.network package to retrieve the NSG resource.
    • Add a new security rule to the NSG by appending it to the security_rules list.
    • Update the NSG resource using the network_client.network_security_groups.create_or_update method.
    from azure.identity import DefaultAzureCredential
from azure.mgmt.network import NetworkManagementClient
from azure.mgmt.network.models import SecurityRule

# Authenticate using default credentials
credential = DefaultAzureCredential()
network_client = NetworkManagementClient(credential, subscription_id)

# Retrieve the NSG resource
nsg = network_client.network_security_groups.get(resource_group_name, nsg_name)

# Add a new security rule to the NSG
new_rule = SecurityRule(name="Allow-SSH", protocol="Tcp", source_port_range="*", destination_port_range="22", access="Allow", direction="Inbound")
nsg.security_rules.append(new_rule)

# Update the NSG resource
network_client.network_security_groups.create_or_update(resource_group_name, nsg_name, nsg)

  3. Example 3: Update Network Security Group Rules

    • Use the azure.mgmt.network package to retrieve the NSG resource.
    • Modify the existing security rules in the NSG as required.
    • Update the NSG resource using the network_client.network_security_groups.create_or_update method.
    from azure.identity import DefaultAzureCredential
from azure.mgmt.network import NetworkManagementClient

# Authenticate using default credentials
credential = DefaultAzureCredential()
network_client = NetworkManagementClient(credential, subscription_id)

# Retrieve the NSG resource
nsg = network_client.network_security_groups.get(resource_group_name, nsg_name)

# Modify the existing security rules in the NSG
for rule in nsg.security_rules:
    if rule.name == "Allow-SSH":
        rule.access = "Deny"

# Update the NSG resource
network_client.network_security_groups.create_or_update(resource_group_name, nsg_name, nsg)