search menu icon-carat-right cmu-wordmark

Subject: Best Practices in Network Security

Situational Awareness for Cybersecurity: An Introduction

Situational Awareness for Cybersecurity: An Introduction

• SEI Blog
Angela Horneman

Situational awareness (SA) helps decision makers throughout an organization have the information and understanding available to make good decisions in the course of their work. It can be focused specifically on helping people and organizations protect their assets in the cyber realm or it can be more far reaching. SA makes it possible to get relevant information from across an organization, to integrate that information, and to disseminate it to help people make better decisions....

Read More
Six Free Tools for Creating a Cyber Simulator

Six Free Tools for Creating a Cyber Simulator

• SEI Blog
Joseph Mayes

It can be hard for developers of cybersecurity training to create realistic simulations and training exercises when trainees are operating in closed (often classified) environments with no ability to connect to the Internet. To address this challenge, the CERT Workforce Development (CWD) Team recently released a suite of open-source and freely available tools for use in creating realistic Internet simulations for cybersecurity training and other purposes. The tools improve the realism, efficiency, and cost effectiveness...

Read More
Business Email Compromise: Operation Wire Wire and New Attack Vectors

Business Email Compromise: Operation Wire Wire and New Attack Vectors

• SEI Blog
Anne Connell

In June 2018, Federal authorities announced a significant coordinated effort to disrupt business email compromise (BEC) schemes that are designed to intercept and hijack wire transfers from businesses and individuals. Operation Wire Wire, a coordinated law enforcement effort by the U.S. Department of Justice, U.S. Department of Homeland Security, U.S. Department of the Treasury, and the U.S. Postal Inspection Service, was conducted over a six-month period and resulted in 74 arrests in the United States...

Read More
How to Use Static Analysis to Enforce SEI CERT Coding Standards for IoT Applications

How to Use Static Analysis to Enforce SEI CERT Coding Standards for IoT Applications

• SEI Blog
David Svoboda

The Jeep hack, methods to hack ATMs, and even hacks to a casino's fish tank provide stark evidence of the risks associated with the Internet of Things (IoT). High-end automobiles today have more than 100 million lines of code, and connectivity between cars and the outside world through, for example, infotainment systems and the Global Positioning System (GPS) expose a number of interfaces that can be attacked to communicate with an automobile in unintended...

Read More
Evaluating Threat-Modeling Methods for Cyber-Physical Systems

Evaluating Threat-Modeling Methods for Cyber-Physical Systems

• SEI Blog
Nataliya Shevchenko

Addressing cybersecurity for а complex system, especially for а cyber-physical system of systems (CPSoS), requires a strategic approach during the entire lifecycle of the system. Examples of CPSoS include rail transport systems, power plants, and integrated air-defense capability. All these systems consist of large physical, cyber-physical, and cyber-only subsystems with complex dynamics. In the first blog post in this series, I summarized 12 available threat-modeling methods (TMMs). In this post, I will identify criteria for...

Read More
Threat Modeling: 12 Available Methods

Threat Modeling: 12 Available Methods

• SEI Blog
Nataliya Shevchenko

Almost all software systems today face a variety of threats, and the number of threats grows as technology changes. Malware that exploits software vulnerabilities grew 151 percent in the second quarter of 2018, and cyber-crime damage costs are estimated to reach $6 trillion annually by 2021. Threats can come from outside or within organizations, and they can have devastating consequences. Attacks can disable systems entirely or lead to the leaking of sensitive information, which would...

Read More
IPV6 Adoption:  Is your ISP ready to support IPv6?

IPV6 Adoption: Is your ISP ready to support IPv6?

• SEI Blog
Joseph Mayes

If you're considering migrating to IPv6, you may be asking, Am I ready? That's a good question to ask, but you also have to ask, Is my ISP ready? If your Internet service provider (ISP) isn't ready for an IPv6 migration, you may have external web sites that won't load, problems receiving email, and many other issues. This post is the latest in a series examining issues, challenges, and best practices when transitioning from IPv4...

Read More
Best Practices in Network Traffic Analysis: Three Perspectives

Best Practices in Network Traffic Analysis: Three Perspectives

• SEI Blog
Angela Horneman

This post is also authored by Tim Shimeall and Timur Snoke. In July of this year, a major overseas shipping company had its U.S. operations disrupted by a ransomware attack, one of the latest attacks to disrupt the daily operation of a major, multi-national organization. Computer networks are complex, often tightly coupled systems; operators of such systems need to maintain awareness of the system status or disruptions will occur. In today's operational climate, threats and...

Read More
IPv6 Adoption: 4 Questions and Answers

IPv6 Adoption: 4 Questions and Answers

• SEI Blog
Joseph Mayes

IPv6 deployment is on the rise. Google reported that as of July 14 2018, 23.94 percent of users accessed its site via IPv6, up 6.16 percent from that same date in 2017. Drafted in 1998 and an Internet Standard as of July 2017, Internet Protocol 6 (IPv6) is intended to replace IPv4 in assigning devices on the internet a unique identity. Plans for IPv6 got underway after it was realized that IPv4's cap of 4.3...

Read More
Best Practices and Considerations in Egress Filtering

Best Practices and Considerations in Egress Filtering

• SEI Blog
Rachel Kartch

When considering best practices in egress filtering, it is important to remember that egress filtering is not focused on protecting your network, but rather on protecting other organizations' networks. For example, the May 2017 Wannacry Ransomware attack is believed to have exploited an exposed vulnerability in the server message block (SMB) protocol and was rapidly spread via communications over port 445. Egress and ingress filtering of port 445 would have helped limit the spread of...

Read More
Implications and Mitigation Strategies for the Loss of End-Entity Private Keys

Implications and Mitigation Strategies for the Loss of End-Entity Private Keys

• SEI Blog
Aaron Reffett

This post is co-authored by Thomas Scanlon. When a private key in a public-key infrastructure (PKI) environment is lost or stolen, compromised end-entity certificates can be used to impersonate a principal (a singular and identifiable logical or physical entity, person, machine, server, or device) that is associated with it. An end-entity certificate is one that does not have certification authority to authorize other certificates. Consequently, the scope of a compromise or loss of an end-entity...

Read More
Best Practices for Cloud Security

Best Practices for Cloud Security

• SEI Blog
Donald Faatz

As detailed in last week's post, SEI researchers recently identified a collection of vulnerabilities and risks faced by organizations moving data and applications to the cloud. In this blog post, we outline best practices that organizations should use to address the vulnerabilities and risks in moving applications and data to cloud services. These practices are geared toward small and medium-sized organizations; however, all organizations, independent of size, can use these practices to improve the security...

Read More
12 Risks, Threats, & Vulnerabilities in Moving to the Cloud

12 Risks, Threats, & Vulnerabilities in Moving to the Cloud

• SEI Blog
Timothy Morrow

Organizations continue to develop new applications in or migrate existing applications to cloud-based services. The federal government recently made cloud-adoption a central tenet of its IT modernization strategy. An organization that adopts cloud technologies and/or chooses cloud service providers (CSP)s and services or applications without becoming fully informed of the risks involved exposes itself to a myriad of commercial, financial, technical, legal, and compliance risks. In this blog post, we outline 12 risks, threats, and...

Read More
5 Best Practices to Prevent Insider Threat

5 Best Practices to Prevent Insider Threat

• SEI Blog
Randy Trzeciak

Insider threat continues to be a problem with approximately 50 percent of organizations experiencing at least one malicious insider incident per year, according to the 2017 U.S. State of Cybercrime Survey. Although the attack methods vary depending on the industry, the primary types of attacks identified by researchers at the CERT Insider Threat Center--theft of intellectual property, sabotage, fraud, and espionage--continue to hold true. In our work with public and private industry, we continue to...

Read More
Ransomware: Best Practices for Prevention and Response

Ransomware: Best Practices for Prevention and Response

• SEI Blog
Alexander Volynkin

This blog post is coauthored by Jose Morales and Angela Horneman. On May 12, 2017, in the course of a day, the WannaCry ransomware attack infected nearly a quarter million computers. WannaCry is the latest in a growing number of ransomware attacks where, instead of stealing data, cyber criminals hold data hostage and demand a ransom payment. WannaCry was perhaps the largest ransomware attack to date, taking over a wide swath of global computers from...

Read More
Best Practices for Network Border Protection

Best Practices for Network Border Protection

• SEI Blog
Rachel Kartch

When it comes to network traffic, it's important to establish a filtering process that identifies and blocks potential cyberattacks, such as worms spreading ransomware and intruders exploiting vulnerabilities, while permitting the flow of legitimate traffic. In this post, the latest in a series on best practices for network security, I explore best practices for network border protection at the Internet router and firewall....

Read More
Best Practices for NTP Services

Best Practices for NTP Services

• SEI Blog
Timur Snoke

The network time protocol (NTP) synchronizes the time of a computer client or server to another server or within a few milliseconds of Coordinated Universal Time (UTC). NTP servers, long considered a foundational service of the Internet, have more recently been used to amplify large-scale Distributed Denial of Service (DDoS) attacks. While 2016 did not see a noticeable uptick in the frequency of DDoS attacks, the last 12 months have witnessed some of the largest...

Read More
Six Best Practices for Securing a Robust Domain Name System (DNS) Infrastructure

Six Best Practices for Securing a Robust Domain Name System (DNS) Infrastructure

• SEI Blog
Mark Langston

The Domain Name System (DNS) is an essential component of the Internet, a virtual phone book of names and numbers, but we rarely think about it until something goes wrong. As evidenced by the recent distributed denial of service (DDoS) attack against Internet performance management company Dyn, which temporarily wiped out access to websites including Amazon, Paypal, Reddit, and the New York Times for millions of users down the Eastern Seaboard and Europe, DNS serves...

Read More
Distributed Denial of Service Attacks: Four Best Practices for Prevention and Response

Distributed Denial of Service Attacks: Four Best Practices for Prevention and Response

• SEI Blog
Rachel Kartch

Late last month, Internet users across the eastern seaboard of the United States had trouble accessing popular websites, such as Reddit, Netflix, and the New York Times. As reported in Wired Magazine, the disruption was the result of multiple distributed denial of service (DDoS) attacks against a single organization: Dyn, a New Hampshire-based Internet infrastructure company. DDoS attacks can be extremely disruptive, and they are on the rise. The Verisign Distributed Denial of Service Trends...

Read More