Perimeter
7/17/2009
03:06 PM
John H. Sawyer
John H. Sawyer
Commentary
Connect Directly
RSS
E-Mail
50%
50%

Defensible Network Architecture Ideal For Incident Response

In my last blog, I talked about how incident response is more than just preparing your first responders by training them and providing them with the tools. Your network and systems need to set up in preparation, too, so that you have the information you need when handling an incident. It wasn't until yesterday that I remembered what I think is one of the best models of network design that fits the mold of what I mean by having your environment ready for an incident.

In my last blog, I talked about how incident response is more than just preparing your first responders by training them and providing them with the tools. Your network and systems need to set up in preparation, too, so that you have the information you need when handling an incident. It wasn't until yesterday that I remembered what I think is one of the best models of network design that fits the mold of what I mean by having your environment ready for an incident.Richard Bejtlich's Defensible Network Architecture 2.0, an updated model of the defensible network architecture (DNA) he defined in his books, describes an environment that is monitored, inventoried, controlled, claimed, minimized, assessed, and current. If only we could all be so lucky to achieve that type of environment one day -- then we'd be in great shape to handle nearly any incident that comes at us.

I'll leave you to go and read Richard's blog entry, but to hit some highlights: Monitoring is an absolute must if you want to know what's going on in your network. The more content you can capture for looking back on when an incident occurs, the better. Just keep in mind that some of the content you capture could be sensitive, so take the necessary precautions to protect your monitoring systems. I know that sounds like a no-brainer, but I saw a group have nearly every one of the IDS hosts owned by a worm because they weren't fully patched and were accessible from the workstation network.

Inventorying and claiming systems go hand in hand. If you can inventory all of your systems and find out their purpose and what they store, you can respond more effectively to incidents. Likewise, knowing who they belong to is huge, yet not always an easy task in a large, diverse enterprise.

I could go on and on about Richard's DNA model and how important trying to achieve it is when preparing to handle incidents, but I think as you read through the different sections, you'll realize it yourself. When you're done, ask yourself how your current environment stacks up and what would it take to get you there.

John H. Sawyer is a senior security engineer on the IT Security Team at the University of Florida. The views and opinions expressed in this blog are his own and do not represent the views and opinions of the UF IT Security Team or the University of Florida. When John's not fighting flaming, malware-infested machines or performing autopsies on blitzed boxes, he can usually be found hanging with his family, bouncing a baby on one knee and balancing a laptop on the other. Special to Dark Reading.

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
Partner Perspectives
What's This?
In a digital world inundated with advanced security threats, Intel Security seeks to transform how we live and work to keep our information secure. Through hardware and software development, Intel Security delivers robust solutions that integrate security into every layer of every digital device. In combining the security expertise of McAfee with the innovation, performance, and trust of Intel, this vision becomes a reality.

As we rely on technology to enhance our everyday and business life, we must too consider the security of the intellectual property and confidential data that is housed on these devices. As we increase the number of devices we use, we increase the number of gateways and opportunity for security threats. Intel Security takes the “security connected” approach to ensure that every device is secure, and that all security solutions are seamlessly integrated.
Featured Writers
White Papers
Cartoon
Current Issue
Dark Reading's October Tech Digest
Fast data analysis can stymie attacks and strengthen enterprise security. Does your team have the data smarts?
Flash Poll
Title Partner’s Role in Perimeter Security
Title Partner’s Role in Perimeter Security
Considering how prevalent third-party attacks are, we need to ask hard questions about how partners and suppliers are safeguarding systems and data.
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2013-7407
Published: 2014-10-22
Cross-site request forgery (CSRF) vulnerability in the MRBS module for Drupal allows remote attackers to hijack the authentication of unspecified victims via unknown vectors.

CVE-2014-3675
Published: 2014-10-22
Shim allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted DHCPv6 packet.

CVE-2014-3676
Published: 2014-10-22
Heap-based buffer overflow in Shim allows remote attackers to execute arbitrary code via a crafted IPv6 address, related to the "tftp:// DHCPv6 boot option."

CVE-2014-3677
Published: 2014-10-22
Unspecified vulnerability in Shim might allow attackers to execute arbitrary code via a crafted MOK list, which triggers memory corruption.

CVE-2014-3828
Published: 2014-10-22
Multiple SQL injection vulnerabilities in Centreon 2.5.1 and Centreon Enterprise Server 2.2 allow remote attackers to execute arbitrary SQL commands via (1) the index_id parameter to views/graphs/common/makeXML_ListMetrics.php, (2) the sid parameter to views/graphs/GetXmlTree.php, (3) the session_id...

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Follow Dark Reading editors into the field as they talk with noted experts from the security world.