- Introduction to the Cisco ASA FirePOWER Module
- Managing Device Configuration
- Managing Reusable Objects
- Getting Started with Access Control Policies
- Blacklisting Using Security Intelligence IP Address Reputation
- Tuning Traffic Flow Using Access Control Rules
- Controlling Traffic with Network-Based Rules
- Controlling Traffic with Reputation-Based Rules
- Access Control Rules: Realms and Users
- Access Control Rules: Custom Security Group Tags
- Controlling Traffic Using Intrusion and File Policies
- Intelligent Application Bypass
- Access Control Using Content Restriction
- Understanding Traffic Decryption
- Getting Started with SSL Policies
- Getting Started with SSL Rules
- Tuning Traffic Decryption Using SSL Rules
- Understanding Network Analysis and Intrusion Policies
- Using Layers in a Network Analysis or Intrusion Policy
- Customizing Traffic Preprocessing
- Getting Started with Network Analysis Policies
- Using Application Layer Preprocessors
- Configuring SCADA Preprocessing
- Configuring Transport & Network Layer Preprocessing
- Tuning Preprocessing in Passive Deployments
- Getting Started with Intrusion Policies
- Tuning Intrusion Policies Using Rules
- Detecting Specific Threats
- Globally Limiting Intrusion Event Logging
- Understanding and Writing Intrusion Rules
- Introduction to Identity Data
- Realms and Identity Policies
- User Identity Sources
- DNS Policies
- Blocking Malware and Prohibited Files
- Logging Connections in Network Traffic
- Viewing Events
- Configuring External Alerting
- Configuring External Alerting for Intrusion Rules
- Using the ASA FirePOWER Dashboard
- Using ASA FirePOWER Reporting
- Scheduling Tasks
- Managing System Policies
- Configuring ASA FirePOWER Module Settings
- Licensing the ASA FirePOWER Module
- Updating ASA FirePOWER Module Software
- Monitoring the System
- Using Backup and Restore
- Generating Troubleshooting Files
- Importing and Exporting Configurations
- Viewing the Status of Long-Running Tasks
- Security, Internet Access, and Communication Ports
Configuring SCADA Preprocessing
You configure Supervisory Control and Data Acquisition (SCADA) preprocessors in a network analysis policy, which prepares traffic for inspection using the rules enabled in an intrusion policy. See Understanding Network Analysis and Intrusion Policies for more information.
SCADA protocols monitor, control, and acquire data from industrial, infrastructure, and facility processes such as manufacturing, production, water treatment, electric power distribution, airport and shipping systems, and so on. The ASA FirePOWER module provides preprocessors for the Modbus and DNP3 SCADA protocols that you can configure as part of your network analysis policy.
If you enable a rule containing Modbus or DNP3 keywords in the corresponding intrusion policy, the system automatically uses the Modbus or DNP3 processor, respectively, with its current settings, although the preprocessor remains disabled in the network analysis policy module interface. For more information, see Modbus Keywords and DNP3 Keywords.
Configuring the Modbus Preprocessor
The Modbus protocol, which was first published in 1979 by Modicon, is a widely used SCADA protocol. The Modbus preprocessor detects anomalies in Modbus traffic and decodes the Modbus protocol for processing by the rules engine, which uses Modbus keywords to access certain protocol fields. See Modbus Keywords for more information.
A single configuration option allows you to modify the default setting for the port that the preprocessor inspects for Modbus traffic.
You must enable the Modbus preprocessor rules in the following table if you want these rules to generate events. See Setting Rule States for information on enabling rules.
Note regarding the use of the Modbus preprocessor that if your network does not contain any Modbus-enabled devices, you should not enable this preprocessor in a network analysis policy that you apply to traffic.
You can use the following procedure to modify the ports the Modbus preprocessor monitors.
To configure the Modbus preprocessor:
Step 1 Select Configuration > ASA FirePOWER Configuration > Policies > Access Control Policy .
The Access Control Policy page appears.
Step 2 Click the edit icon (
) next to the access control policy you want to edit.
The access control policy editor appears.
Step 3 Select the Advanced tab.
The access control policy advanced settings page appears.
Step 4 Click the edit icon (
) next to
Network Analysis and Intrusion Policies
.
The Network Analysis and Intrusion Policies pop-up window appears.
Step 5 Click Network Analysis Policy List .
The Network Analysis Policy List pop-up window appears.
Step 6 Click the edit icon (
) next to the policy you want to edit.
If you have unsaved changes in another policy, click OK to discard those changes and continue. See Resolving Conflicts and Committing Policy Changes for information on saving unsaved changes in another policy.
The Policy Information page appears.
Step 7 Click Settings in the navigation panel on the left.
Step 8 You have two choices, depending on whether Modbus Configuration under SCADA Preprocessors is enabled:
The Modbus Configuration page appears. A message at the bottom of the page identifies the network analysis policy layer that contains the configuration. See Using Layers in a Network Analysis or Intrusion Policy for more information.
Step 9 Optionally, modify the Ports that the preprocessor inspects for Modbus traffic. You can specify an integer from 0 to 65535. Use commas to separate multiple ports.
Step 10 Save your policy, continue editing, discard your changes, revert to the default configuration settings in the base policy, or exit while leaving your changes in the system cache. See Resolving Conflicts and Committing Policy Changes for more information.
Configuring the DNP3 Preprocessor
The Distributed Network Protocol (DNP3) is a SCADA protocol that was originally developed to provide consistent communication between electrical stations. DNP3 has also become widely used in the water, waste, transportation, and many other industries.
The DNP3 preprocessor detects anomalies in DNP3 traffic and decodes the DNP3 protocol for processing by the rules engine, which uses DNP3 keywords to access certain protocol fields. See DNP3 Keywords for more information.
You must enable the DNP3 preprocessor rules in the following table if you want these rules to generate events. See Setting Rule States for information on enabling rules.
Note regarding the use of the DNP3 preprocessor that, if your network does not contain any DNP3-enabled devices, you should not enable this preprocessor in a network analysis policy that you apply to traffic. See Configuring TCP Stream Preprocessing for more information.
The following list describes the DNP3 preprocessor options you can configure.
Enables inspection of DNP3 traffic on each specified port. You can specify a single port or a comma-separated list of ports. You can specify a value from 0 to 65535 for each port.
When enabled, validates the checksums contained in DNP3 link layer frames. Frames with invalid checksums are ignored.
You can enable rule 145:1 to generate events when invalid checksums are detected.
To configure the DNP3 preprocessor:
Step 1 Select Configuration > ASA FirePOWER Configuration > Policies > Access Control Policy .
The Access Control Policy page appears.
Step 2 Click the edit icon (
) next to the access control policy you want to edit.
The access control policy editor appears.
Step 3 Select the Advanced tab.
The access control policy advanced settings page appears.
Step 4 Click the edit icon (
) next to
Network Analysis and Intrusion Policies
.
The Network Analysis and Intrusion Policies pop-up window appears.
Step 5 Click Network Analysis Policy List .
The Network Analysis Policy List pop-up window appears.
Step 6 Click the edit icon (
) next to the policy you want to edit.
If you have unsaved changes in another policy, click OK to discard those changes and continue. See Resolving Conflicts and Committing Policy Changes for information on saving unsaved changes in another policy.
The Policy Information page appears.
Step 7 Click Settings in the navigation panel on the left.
Step 8 You have two choices, depending on whether DNP3 Configuration under SCADA Preprocessors is enabled:
The DNP3 Configuration page appears. A message at the bottom of the page identifies the network analysis policy layer that contains the configuration. See Using Layers in a Network Analysis or Intrusion Policy for more information.
Step 9 Optionally, modify the Ports that the preprocessor inspects for DNP3 traffic. You can specify an integer from 0 to 65535. Use commas to separate multiple ports.
Step 10 Optionally, select or clear the Log bad CRCs check box to specify whether to validate the checksums contained in DNP3 link layer frames and ignore frames with invalid checksums.
Step 11 Save your policy, continue editing, discard your changes, revert to the default configuration settings in the base policy, or exit while leaving your changes in the system cache. See the Network Analysis Policy Editing Actions table for more information.
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