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The Practitioner's Guide to Deploying, Optimizing and Managing Next-Generation Firewalls

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The Practitioner's Guide to Deploying, Optimizing and Managing Next-Generation Firewalls THE PRACTITIONER’S GUIDE TO DEPLOYING, OPTIMIZING AND MANAGING NEXT-GENERATION FIREWALLS An AlgoSec Whitepaper MANAGE SECURITY AT THE SPEED OF BUSINESS AlgoSec Whitepaper The Firewall Evolves Ever since “Stateful Inspection” was introduced in the late 1990’s, firewall administrators and information security officers have been defining security policies based primarily on a connection’s source IP address, destination IP address, and service. However, today we live in an application-centric business environment (“there’s an app for that”) and applications are intertwined with our professional and personal lives. But along with their associated benefits come risks. Increased use of applications, mobility, virtualization, and network security consolidation as well as the evolution of sophisticated threats has driven requirements for new features and capabilities all built into one firewall. Enter Next Generation Firewalls (NGFWs). While NGFWs provide newfound levels of policy granularity and controls - Application Control, IPS, antimalware, email security and more - they also introduce more complexity that can cause more harm than good. Without proper sizing of capabilities for the environment, firewall performance can drop off significantly. And without careful design and maintenance, a poorly optimized NGFW policy could take what was a single rule allowing http, and become a policy that includes 10,000 new rules, one per application – creating more opportunity for error and risk. This paper will highlight tips to effectively implement next-generation firewalls and optimize policies so that you can enjoy the clear benefits without falling into overly complex, unmanageable and risky policy traps. Next-Generation Firewalls Exposed – Improved Security at a Cost if Not Managed Properly In a recent survey, 68% of respondents reported to have adopted NGFWs to improve protection from cyber-attacks. 31.2% of those who adopted NGFWs stated that they faced challenges when defining NGFW policies. Therefore, organizations considering adopting NGFWs would be well advised to focus their efforts on centralizing and automating their firewall policy management processes across their entire estate. Automating these processes can help organizations reap the full benefits that next-generation firewalls provide - without increasing the operational workload, decreasing firewall performance, introducing risk and/or slowing down the business. Source: The State of Network Security 2014 THE PRACTITIONER’S GUIDE TO DEPLOYING, OPTIMIZING AND MANAGING NGFWs | 2 Getting the Value of NGFWs Policy is NOT a Black or without the Risk and Overhead White Decision Security policy typically falls into a Before you can address these challenges, you must keep whitelisting or blacklisting bucket. in mind that your organization’s network almost Whitelisting provides more security, but certainly has other devices (and in turn other policies) more operational burden, while that must be managed as well, including traditional blacklisting is easier to manage, but firewalls, routers, Secure Web Gateways and more. inherently less secure. Additionally there are more specific questions you must answer first in order to address the bigger picture Firewalls have traditionally used a question, such as: whitelisting strategy which puts a significant workload on firewall What NGFW features do you want to size for your administrators as every new connection environment (i.e. IPS, Application Control, Identity potentially requires another firewall rule Awareness, URL Filtering, Email Security, etc.)? – which has to be planned, approved, If you decide to whitelist at the application level implemented, and validated. Some (i.e. block outbound TCP/80 and only allow those organizations process 100s of rule web applications you know about)… change requests every week - and suffer How many more change requests per week will turnaround times of several weeks you be processing? between change request and Can your existing team handle the extra load implementation. without degradation to turnaround time? Additionally, the more rules in the Does your existing team need any new training firewall, especially if not optimally to properly define/enforce this type of policy? ordered, the more processing power Will you require additional headcount? needed. A firewall with 100 rules What is the impact if you define policy via a processes traffic requests more quickly blacklisting approach, via rules like “block social than a firewall with 1,000 rules because networks, file sharing and video streaming, and it must parse through the list of rules to allow all other web traffic”? get to the one that allows or denies a What about the challenges of managing such specific route. Oftentimes, this leads policies alongside traditional firewall policies organizations to invest in more that are based on Source, Destination and hardware, which isn’t always necessary. Service? Next-Generation Firewalls exacerbate this challenge but what NGFWs also IT must clearly define the NGFW capabilities that are allow you to do is to leverage a hybrid required and properly size the deployment for their policy approach. environment. Additionally, IT must understand which Watch the video applications are needed by which users and provide below to learn more.\ access - without slowing down business productivity and without opening security gaps for data leakage or malware. THE PRACTITIONER’S GUIDE TO DEPLOYING, OPTIMIZING AND MANAGING NGFWs | 3 Next Generation Firewall Deployment Scenarios There are certain places within the network where it NGFW Do’s & Don’ts may be particularly beneficial to deploy NGFWs. Some Here are some things to keep in mind options and examples (depending on your needs and when deploying next-generation environment) include: firewalls: Filtering Web-based Traffic at the Edge. The first Do: and primary point to consider when deploying a • Size your implementation for all of NGFW is filtering external internet traffic. This is the capabilities you will be using. where NGFWs can significantly improve your • Assess the quality of your Active security if the right policies are applied. Directory (AD). A poorly configured Dedicated Segments of the Network. Deploy AD will impact the NGFW’s identity NGFWs where you have separate and dedicated awareness capability. locations for servers and gateways. Examples • Keep your current IPS configuration include: information – regardless of if your PCI DSS Segmentation. For organizations that IPS is standalone or integrated with must comply with PCI DSS, you may want to your NGFW. segment your PCI environment from the rest of • Educate your users about application your network. NGFWs can help here because control and what is allowed/not they provide deeper policy granularity at an allowed per policy. application and user level. Don’t: Remote/mobile User Segmentation. With increased user mobility (i.e. the same person • Turn on every NGFW capability appearing in different places with different IP unless you’ve properly sized the addresses, and policy needs to be applied to a firewall capabilities - unless you’re ok device tied to a person as opposed to IP with performance dropping off a address), routing this traffic through a NGFW cliff! may make sense. One example would be to • Recreate the wheel by starting from conduct user-based filtering where mobile scratch with your IPS configuration. users are connecting through VPN, or for WiFi • Enforce application control without traffic. starting out in a monitoring mode. THE PRACTITIONER’S GUIDE TO DEPLOYING, OPTIMIZING AND MANAGING NGFWs | 4 Considerations for Building NGFW Policies Typically a next-generation firewall is implemented into a defense-in-depth architecture (i.e. an environment that also has traditional firewalls, Secure Web Gateways, IPS, etc.), and the policy enforcement capabilities within each device type are not equal. When replacing a traditional firewall with a NGFW there are two approaches you can take: 1. Migrate the stateful firewall policy into the NGFW. This commonly used approach is where the original policy is converted into a NGFW policy. While different vendors have their own homegrown tools for conversion, you want to also leverage a firewall policy management solution which can compare the policies between the two different firewalls to ensure that the NGFW is properly configured. Once this is done, you can remove the original stateful firewall from the network and rely upon the NGFW which will be working as if it were a stateful firewall (at this point the NGFW isn’t leveraging application or identity awareness). Or you can leave the original firewall in place, as many organizations prefer a defense-in-depth approach where the next-generation firewall runs behind the traditional firewall to provide an additional layer of security. Once running, the NGFW will pull in application, user and group information that can be analyzed to build out more granular NGFW policies. For example, if the old rule number 14 is frequently used, but it only supports the Sharepoint application, you can fine-tune the rule to allow only this application. This limits the exposure without impacting the business. 2. Build the rule base from scratch. This approach is not as commonly used, but depending on your environment it may make sense. In this case, the original stateful firewall should remain in place while the NGFW runs essentially in a “learning mode” to gain visibility of applications, users
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