Sending pfSense logs to the DShield project

Sending pfSense logs to the DShield project

Changelog 02June2017 – Originally posted 28Nov2017  – Updated due to script changes What is DShield and why would I send them my logs? According to the SANS Internet Storm Center (ISC), “DShield provides a platform for users of firewalls to share intrusion information. DShield is a free and open service.” While DShield is often referred to generically as a “collaborative firewall log correlation system,” for all practical purposes, it is a bit of threat intelligence well before threat intelligence was…

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Testing SPF, DKIM, and DMARC

Testing SPF, DKIM, and DMARC

If you are interested in a step-by-step implementation of SPF, DKIM, and DMARC, there’s a post for that! It’s on this site as well and it will walk you through the entire process. https://www.linuxincluded.com/implementing-spf-dkim-and-dmarc/ Changelog 17Nov2017 – Originally posted 25Mar2018 – Added more SPF tests specifically for lookups Before you jump into testing SPF, DKIM, or DMARC, you need to verify where your authoritative DNS nameservers are. The easiest way to do this is by going to a Linux command…

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Implementing SPF, DKIM, and DMARC

Implementing SPF, DKIM, and DMARC

If you made it here, you might not be interested in the why’s of implementing the holy trinity – SPF, DKIM, and DMARC – of anti-email spoofing. However, if you’re still uncertain whether you should or shouldn’t, just do it! With the guide below, you’ll see it isn’t all that difficult and when used together, they provide great benefits like brand protection, reducing a phishing attack vector, less chance of your legitimate marketing emails ending up in spam, etc. It also…

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Securing Open RDP Ports

Securing Open RDP Ports

Mr. Mackey says it best — Open RDP ports on the internet are bad… mmmmkay. When you are architecting an environment, you should avoid them like the plague. Even on an internal network, you should avoid them. Otherwise, you are just asking for problems at some point whether it is someone pounding away looking for a username/password combination or a remote vulnerability in the service. Compromised servers (via RDP) are mainstays for criminal jump points and some are even monetizing…

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Installing Nagios XI on CentOS 7

Installing Nagios XI on CentOS 7

First things first, why CentOS 7 instead of 6? Well, CentOS 6 has issues with Python updating because of yum. Yes, you can install a separate instance, but it’s not fun and it can break down the road. Second, why not use the OVA provided by Nagios? As of September 2017, the version of Python on the OVA is ancient — 2.6.6. And because yum is tied to it, you can’t update it or you need to install a separate…

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Hacking HL7 Data Interfaces in Medical Environments: Attacking and Defending the Achille’s Heel of Healthcare

Hacking HL7 Data Interfaces in Medical Environments: Attacking and Defending the Achille’s Heel of Healthcare

This security research paper is the second of two examining the HL7 messaging standard, which is arguably the most fundamental flaw in healthcare IT. HL7 is used extensively for system-to-system communications and is in nearly every healthcare facility worldwide. The first paper is an overview of what can be done with stolen medical data, what HL7 is, as well as potential dangers inherent to HL7. The second paper moves beyond theory and is an in-depth, technical discussion on ways to…

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HL7 Data Interfaces in Medical Environments: Understanding the Fundamental Flaw in Healthcare

HL7 Data Interfaces in Medical Environments: Understanding the Fundamental Flaw in Healthcare

This security research paper is the first of two examining the HL7 messaging standard, which is arguably the most fundamental flaw in healthcare IT. HL7 is used extensively for system-to-system communications and is in nearly every healthcare facility worldwide. The first paper is an overview of what can be done with stolen medical data, what HL7 is, as well as potential dangers inherent to HL7. The second paper moves beyond theory and is an in-depth, technical discussion on ways to…

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Shadow Brokers Dump And Best Practices

Shadow Brokers Dump And Best Practices

Well that’s a weird title, right? Now that the dust has settled to some degree, let’s look at a not-so-obvious takeaway from the latest security news that simultaneously set everyone’s hair on fire? The latest Shadow Brokers dump is bad on so many different levels. Let’s not concentrate on the potential levels of government and private industry collusion our guts told us existed, but we weren’t sure of. Even now, Microsoft is claiming the vulnerabilities were fixed as part of a…

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Why Phone Numbers Make Horrible WiFi Passwords

Why Phone Numbers Make Horrible WiFi Passwords

Aside from discussing the most obvious item (in the title), you also have the issue of why your average ISP isn’t helping out the security of the average consumer. In addition, the underlying theme here is that installation and implementation matters. You can have the best security/encryption on the planet and someone else can trash it in short order simply because they implement it wrong. Also note that while I won’t be publicly naming them, I will instead provide my emails…

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Using pfBlockerNG (And Block Lists) On pfSense

Using pfBlockerNG (And Block Lists) On pfSense

If you are also interested in pfBlockerNG (DNSBL) for ad and malvertising blocking, I have a walk-through on it here!  –> Blocking Ads & Malvertising on pfSense Using pfBlockerNG (DNSBL) <– In a previous post, I talked about implementing blocklists (aka IP reputation lists, ban lists, blacklists, etc.) generically on nearly any firewall to improve your security. The examples I used were on pfSense and OPNsense. I also discussed the methodology and some background as well so if you’re just coming into…

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