Security Tools And Technology Archives

DNS Firewall to Enhance Your Networks Security | CleanBrowsing

Published in Security on October 7, 2019

DNS is the internets lookup table, it builds a bridge between the domain name (e.g., perezbox.com) and the IP address (e.g., 184.24.56.17). The IP address being where you can find the server that hosts the domain. In addition to its job as a lookup table, it can also serve as an effective security control.

DNS is light weight, doesn’t require an installation, highly effective, conforms to the TTP’s employed by attackers, and, more importantly, affordable.

This article will introduce the concept of a DNS Firewall (Protective DNS) and encourage you to think of it as an additional layer in your security governance program.

Mitigating Attack Tactics

Understanding how attackers leverage domains in their attacks allows us to appreciate how effective DNS can be. Here are few tactics, techniques and procedures (TTP) leveraged by attackers that helps illustrate the point:

Benign Websites	An attacker compromises a benign site (domain), it’s used to distribute malware, or perform other nefarious activity (e.g., Phishing, SEO Spam, etc…)
Malicious Site	An attacker creates a malicious site (domain), it’s sole purpose is to distribute malware, or perform other nefarious activity (e.g., Phishing, SEO Spam, Dropper, etc…)
Command & Control (C&C)	Command and Controls (C&C) is what an attacker uses to facilitate their orchestration. Payloads will phone home to C&C’s for instructions on what to do next.

The scenarios above both leverage Fully Qualified Domain Names (FQDN) for the site to render.

Example 1: The 2019 Mailgun Hack

In 2019 there were number of WordPress hacks that exploited a vulnerability in a well known plugin. This exploit affected thousands of sites, including the popular Mailgun service.

Attackers used their access to embed JS code on the sites that would initiate calls to a number of different domains: hellofromhony[.]org, jqueryextd[.]at, adwordstraffic[.]link. These domains would then initiate different actions (including stealing credit card information) depending on the request.

The embedded JS payload initiates a DNS request.

Example 2: Managing Multiple Servers

Assume you are an organization responsible for 100’s, if not 1,000’s, of servers. An attacker bypasses your defenses and moves laterally through the network. In the process, the attacker sprinkles droppers across the network designed to phone home to their C&C.

The phone home initiates a DNS request.

Example 3: – Mitigating User Behavior (Phishing)

If there is something we can always count on is curiosity always kills the cat. Users always click.

Clicking the link initiates a DNS request.

The Effectiveness of DNS

The examples above are only a few that quickly illustrate how DNS can be leveraged to mitigate attacks. To help support the case, we can look at the Verizon Data Breach Investigations Report (DBIR).

Analyzing a five year period, 2012 through 2017, you find that close to a third of the 11,079 confirmed data breaches were identified to be threat actions that DNS could have mitigated (source: Global Cyber Alliance 2018). Having a security control with 1/3 control relevance is pretty impactful for any organization.

With DNS as the backbone of how the internet works, any time a domain is queried DNS is, by design, triggered. Consider the different scenarios above, and you quickly realize that DNS is the gateway that all requests have to pass through.

DNS Firewall (Protective DNS) as a Security Control

The illustration above shows how and where a DNS Firewall might fit in your networks architecture.

The DNS firewall will inspect the initial query, verifying that it’s safe, before allowing it to proceed with the rest of the DNS communication chain. There are a number of great DNS Firewall services; I personally leverage the CleanBrowsing Security Filter (it’s Free and highly effective).

IPv4 address: 185.228.168.9 and 185.228.169.9
IPv6 address: 2a0d:2a00:1::2 and 2a0d:2a00:2::2

If you run your own internal DNS you want to look into leveraging Response Policy Zones (RPZ). RPZ is a security specification and protocol to enhance DNS resolvers with security intelligence about the domains it is handling. It allows a local DNS resolver to restrict access to content that is malicious or unwanted. It allows you to create your own DNS Firewall.

This deployment is applicable to large organizations and homes alike. :)

Rethinking the Value of Premium SSL Certificates

Published in Security on August 12, 2019

There is an active campaign to reshape how online consumers see SSL certificates, with special interest in shutting down premium certificates by the browsers and security practitioners. This article will shed some light into what is going on, provide some context as to why it’s happening; and it will also offer my own personal opinions and recommendations for the future.

In summary, premium certificates – specifically EV’s – offer more value than we’re letting on because we’re allowing the wrong things cloud the conversation.

Making Sense of the SSL Ecosystem

I recommend reading my primer on SSL, specifically how HTTPS works.

An SSL Certificate is a digital file that binds an identity with a public key and a cryptographic private key. This file is used to verify and authenticate the owner (an identity) of the certificate during a communication exchange between two systems. This SSL Certificate is also what allows you to make use of the HTTPS / TLS protocols on your website.

A site that is leveraging HTTPS/TLS makes use of an SSL certificate to accomplish two goals:

Authenticates the identity of the website to the site visitor;
Protects, via Encryption, information as it’s transmitted from the web browser to the web server. It ensures that data in transit cannot be intercepted (e.g., MiTM attack) by a bad actor;

Here is a great example:

What you see in this example is that this certificate was issued to the godaddy.com domain by the GoDaddy Certificate Authority (CA). These CA’s are responsible for the creation, issuance, revocation, and management of SSL certificates.

How SSL Certificates Are Created

How they go about performing these duties are defined by a voluntary organization known as the Certificate Authority / Browser (CA/B) forum. The output of this forum is something known as the Baseline Requirements (BR), and these BR’s are the rules by which CA’s must abide by if they want their certificates to be recognized by something known as the browsers root store.

Being in the browsers root store is critical for a CA. To appreciate the importance of the browsers root store simply go to September 2017 when Chrome distrusted Symantec’s root certificate. The impact of being distrusted results in every certificate issued by the CA rendering a page like this:

So yes, having a publicly trusted root is the bloodline of every CA. These root certificates are used in the issuance of certificates, and as long as the CA follows the rules defined by the BR’s then root stores will “Trust” the CA’s root certificate in their root store.

Type of SSL Certificates

Under the rules set forth by the BR, CA’s have the ability to issue a number of different certificate types.

For the purposes of this article I’ll focus only on three:

Domain Validation (DV)	Validating the Applicant’s ownership or control of the domain.
Organization Validation (OV)	Validating the Applicant’s identity as a company or individual and the domain.
Extended Validation (EV)	Validates the legal entity that controls the website. this is the most stringent validation process available.

A couple things to clarify:

All certificates function the same in protecting information in transit, you’re not getting a higher or lower degree of encryption with either certificate, the encryption ciphers are set by the web servers and the minimum values are defined by the BR’s;
The thing that has always differentiated these certificates to the public has been their treatment on browsers;
The treatment for DV / OV certificate are the same on browsers, and EV’s have always been that special option;

Treatment of SSL Certificate Types

The thing that has always set the certificate types apart has been their treatment on the browser User Interface (UI). The original premise of the treatment was to enable the web users, like you, to quickly delineate those sites that had gone through additional scrutiny in their validation process.

For these examples I’m going to focus on Chrome because it’s the most widely adopted browser in the market (55% market share as of July 2019). They are also the ones leading the fight against premium certificates and the changes I’ll highlight below.

Here is an example of what an DV / OV certificate might look like in the URL inside the Chrome browser today (in 2019):

Here is an example of what an EV certificate might look like in the URL inside the Chrome browser today (in 2019):

Here is an example of what the certificates used to look like:

As you look through the examples above you can quickly see what is happening. The treatment of EV certificates is changing dramatically. In earlier versions it was easy to point out those sites that had gone through higher scrutiny in their validation process, and in theory it should have given web users a higher degree of confidence in the legitimacy of the site.

Here is an example of what you can expect in future releases of the Chrome browser:

What you see above is work being done by Google to remove the indicator all together. You can expect the final iteration to potentially look very different than the proposal above.

The genesis of why can be found in Google’s release of a research paper titled The Web’s Identity Crisis: Understanding the Effectiveness of Website Identity Indicators.

The entire paper boils down to this:

In 14 iterations on browsers’ EV and URL formats, no intervention significantly impacted users’ understanding of the security or identity of login pages.
Authors: Christopher Thompson, Martin Shelton, Emily Stark,Maximilian Walker, Emily Schechter, Adrienne Porter Felt – Google

In other words, there was no perceived value of the UI indicators. Because there is no value, Google will proceed with removing them (in the form of burying them deep into secondary panels). You can expect that the next analysis will show that users do not click on the secondary panels, as such their value is further diminished.

Discourse Makes a Solution Difficult

Here are some of my personal observations, points of contention and positions across both sides of the aisle as to why premium certificates are ineffective:

Even amongst security professional few truly understand the difference between certificate types;
We never really brought about good awareness to what these indicators were meant to signify;
The CA/B forum is comprised of a lot of attorneys, this creates a very CYA like approach to development of BR’s – in other words, we avoid anything that might imply liability. This framing makes it difficult, we shy away from things like “assurance” and “trust” and creates an environment of extreme interpretations;
Massive commercial entities were built around these SSL certificates, such that any perspective from a CA is immediately dismissed because it’s believed to be impartial and beholden purely to commercial interests;
There are real challenges like collisions in the systems, where two entities could exist with the same name, established under different jurisdictions. Which technically, isn’t really a problem if it’s a legitimate entity;
We inaccurately try to place value on premium certificates on things like security (e.g., premium certificates curtail phishing). This narrative derails and distracts the conversation;
Perception of issues exist with the fact that you can have a validated entity that is not the same as the domain (e.g., domains owned by franchises). Which technically isn’t a problem if we refine the meaning of the value of the premium certificate and the assurances it provides;
As a community there is an “us” vs “them” mentality, where the browsers are good and the CA’s are bad. This has led to a contentious, toxic, relationship between both parties, which does little for the web;
We lean on security whenever there is no valid answer, never differentiating between practical and theoretical security;
We claim to be considerate of the greater web, but share very little empathy for the challenges we’re introducing to the consumers (both micro-businesses, large organizations, and passive consumers) of the web;
The advent of social platforms has given a platform to pundits all around the world, experts and influencers alike, that amplify and convolute the conversation in the interest of goodness, fairness and security while simultaneously adding emotion and unreasonable candor making it impossible to collaborate for a better outcome – then again, this affects almost every industry these days;
The validation process requires humans, humans are fallible, and it precludes us from automating and making it available to the masses in scalable manner;
Traditionally, CA’s have been perceived to be stuck in their ways, my own organization included, incapable of keeping up with the evolution of the web – we are probably our own worst enemy;

The Unrecognized Value

Studies have been conducted on both sides of the aisle. On the browsers’ side, a study by Google (The Web’s Identity Crisis: Understanding the Effectiveness of Website Identity Indicators) showed that web users don’t recognize value in UI indicators. On the CA side, you have a study by Georgia Tech (funded by Sectigo) (Understanding the Role of Extended Validation Certificates in Internet Abuse) which tries to show a low propensity for validated domains to be used for malicious purposes. Whether you agree with the methodologies leveraged or the outcomes they offer, I believe the unrecognized value is somewhere in between.

I believe that Google is right, in today’s incarnation of the UI indicators it is absolutely realistic to believe that web users have no understanding of what they mean. I also believe, to an extent, that Georgia Tech’s study (while a bit limiting) speaks to a truth in the low propensity of a validated organization to be used for malicious purposes.

I believe we are missing some really interesting opportunities to help bridge the trust gap online through a structure that is already in place:

The validations being done for certificates like EV’s, whether we like it or not, and regardless of what the BR’s state, should facilitate a level of assurance of legitimacy to web users.
While not perfect, the public Web Trust ecosystem built between browsers and CA’s can be the building blocks for something that has a dramatic impact on the great problem of identity assurance and trust on the web.
There is some validity to the idea that a site that has a premium certificate, specifically EV, has a lower propensity to be used for malicious purposes. It’s not so much the cost, but more the level of effort required to forge all the required documents and forms of proof (which sometimes requires updating gov’t systems).
Validating an entity is valuable, whether they are doing something malicious or not. The process of validating helps collect real information that can be used later if required.
Another anecdotal insight comes in what the idea of “validating” actually means to a domain holder. It’s arguable that an organization that is going through the process of validating their domain cares enough about their identity, their security, to have more controls than the average Joe to ensure the integrity of their site. This is especially important when you think how most Phishing attacks happen today (i.e., benign sites being hacked and being used maliciously).

Where I disagree is in the statements that removing the UI indicator is the solution or that EV’s deter phishing attacks.

A failure to understand the indicator doesn’t mean the indicator isn’t valuable, but rather that we should work harder to pull the value forward.

Ironically, there is probably no greater example of the power of awareness and education than Google’s very own #httpseveryhwere campaign. A campaign in which Google drove home the importance of a HTTPS/SSL indicator by leveraging their greatest asset – SERP rankings. This initiative worked to educate consumers to look for the “lock” and the “secure” indicators, which makes me believe we can educate web consumers.

We live in a world where trust online is growing in importance. As such, we should be leaning into solutions that help pull forward that value. There are over a billion websites live on the web, and growing. Web consumers struggle every day with understanding what websites they can / should interact with.

As a community we should revisit the value and purpose of the premium certificates, specifically EV’s, and place emphasis around things like “trust” and “assurance.” We should work to pull that value forward in a way that we can help consumers differentiate and recognize easily.

Disclaimer

In full disclosure, I’m GoDaddy’s General Manager (GM) for the Security product group. This business line includes GoDaddy’s Certificate Authority (CA), which means we sell SSL certificates. The portfolio has considerable depth in the presence domain; features like a Web Application Firewall (WAF), Content Delivery Network (CDN), Security Scanning, Brand Monitoring, Incident Response, Premium DNS, Website Backups and the Sucuri brand.

The Evolving World of DNS Security

Published in Security on March 2, 2019

I was recently at an event listening to representatives of ICANN and CloudFlare speak on security with DNS and it occurred to me that very few of us really understand or appreciate its nuances. It also so happens that the past 5 years have brought forward a lot of curious, and interesting, developments in one of the last untouched founding components of the internet.

DNS Primer

The Domain Name System (DNS) is comprised of a number of different Domain Name Servers (DNS). I wrote an article that offers an illustration and better understanding of how the entire DNS ecosystem works together. There is an even cooler illustration explaining how DNS works.

Installing OSSEC on Linux Distributions

Published in Security on January 3, 2019

The last few posts have been about deploying and configuring OSSEC as an important tool in your security suite. In this article I will provide you a script I wrote to help you quickly deploy OSSEC.

This script assumes you are deploying on a Linux distribution (e.g., Fedora, Ubuntu, CentOS, or Debian). It will force you to choose a distribution OS before it runs, this ensures it installs the appropriate dependencies based on the distribution type.

OSSEC FOR WEBSITE SECURITY: PART III – Optimizing for WordPress

Published in Security on December 13, 2018

The previous OSSEC articles went through through the process of installing OSSEC and deploying a distributed architecture. This article will focus on configuring OSSEC to make better sense of WordPress activity.

WordPress is a powerful open-source Content Management System (CMS). Its biggest security weakness has always been its biggest blessing – its extensibility (e.g., plugin, themes, etc…). The years at Sucuri have taught me that post-compromise there is nothing more important than have good logs. They are the key to understanding what happened. They are also the key to identifying a bad actors intent before their actions materialize into something nefarious.

Fun fact: The premise of the Sucuri Security plugin was almost exclusively for this visibility. Over the years we added more features to accommodate a more robust application security toolset, but that was always a secondary objective. In fact, the premise of the Sucuri plugin was actually built based on the lessons Daniel learned with OSSEC.

How to enable 2FA on Twitter with Authy, Google Authenticator or another Mobile Application

Published in Security on November 29, 2018

It’s been a long time since I have had to enable 2FA on Twitter and found the process completely infuriating. Twitter’s 2FA configuration uses SMS as the default option, this is no longer advised by NIST.

We don’t have to look far to understand why; in the TTP’s leveraged to hijack a customers domain portfolio the weakest link was the attackers ability to hijack a users SIM card (i.e., which would lead to SMS hijacking).

It is recommended you leverage Time-based One-Time Password applications (e.g., Authy, Google Authenticator) for your 2FA needs. Unfortunately, doing this on the Twitter application requires multiple steps. This guide will walk you through the process.

Tips to Protect Your Domain[s] Investments

Published in Security on November 20, 2018

A few months back I was working with a customer that was having the worst day of their lives. Attackers had taken full control of their most critical digital asset – their domains and the domains of their customers.

The organization affected was an agency. They built and managed sites for their customers and in a relatively short period they lost access to their site and their emails. In this article I’ll share what happened, and offer tips that would have made things a lot harder for the attackers to hijack their domains.

A Primer on DNS and Security

Published in Security on November 4, 2018

If you’re reading this article you’ve interacted with DNS. In fact, you’d be hard pressed to spend any time online and not interact with DNS.

Many of us spend very little time thinking about it. By design, it’s a “set-it and forget-it” tool that is often set up on our behalf (e.g., our home network, local ISP, office network). Ironically, it’s a critical piece of our security landscape.

This post will explain what DNS is and highlight some of it’s key security considerations.

How HTTPS Works – Let’s Establish a Secure Connection

Published in Security on October 28, 2018

The need to use HTTPS on your website has been spearheaded by Google for years (since 2014), and in 2018 we saw massive improvements as more of the web became encrypted by default. Google now reports that 94% of its traffic on the web is now encrypted.

What exactly does HTTPS mean though? And how does that relate to SSL or TLS? These are the more common questions I get when working with customers and in this article I hope to break it down for the every day website owner.

Creating a Safe Online Experience At Home with Content Filtering

Published in Security on October 13, 2018

As a parent, and a technologist, I struggle with creating a safe online experience at home. I’m constantly playing with different technologies – hardware and software – trying to find a healthy configuration that will give me a higher degree of confidence inside my trust zone.

I am specifically thoughtful about what my kids will see as they traverse the web. I want them to explore, but I’m also very concerned about what the web will throw at them. As a technologist that specializes in web security, I’m specifically concerned about the threats that web-based malware pose – specifically things like drive-by-downloads delivered via malvertising or malicious injections inside otherwise benign sites (i.e., hacked sites). There are a number of different tools I’ve played with over the past year and a half, things like OpenDNS, Disney’s Circle, CloudFlare’s 1.1.1.1., and CleanBrowsing.

Good Password Hygiene Requires Behavior Changes and Password Managers

Published in Security on October 6, 2018

For years I advocated the importance of good hygiene. The importance of using complex, long and unique passwords. But where this approach falls short is that it’s dependent on one very important element – you, the user.

Today, I draw all my energy trying to impress upon users like you the importance of a password manager. I personally use LastPass, but I don’t personally care which one you use.

Google Begins Campaign Warning Forms Not Using HTTPS Protocol

Published in Security on August 17, 2017

August 2014, Google released an article sharing their thoughts on how they planned to focus on their “HTTPS everywhere” campaign (originally initiated at their Google I/O event).

The premise of the idea was that every website, regardless of what it was doing, should be communicating securely between point A and point B. To help motivate users, it went right for the carotid artery by making it a ranking factor in search.

December 2015, Google adjusted their crawlers to start start prioritizing and indexing HTTPS pages by default. If you had HTTP / HTTPS, they would start giving more weight to your HTTPS pages.

Defense in Depth And Website Security

Published in Security on October 23, 2016

The concept of Defense in Depth is not new. It’s been leveraged in the InfoSec domain for a long time, and has it’s roots deeply embedded in military strategy and tactics. That however doesn’t mean that even those in the InfoSec domain explain or implement it correctly. To fully appreciate the idea of Defense in Depth you have to subscribe to a very simple idea:

There is no single solution capable of providing 100% protection against any environment.

I recently wrote an article on the Sucuri blog sharing some thoughts on how I feel we should think about the concept, and how we should go about deploying it within our technology stacks and organizations. I expanded my thoughts this past weekend at the BadCamp Hack The Planet summit in Berkeley where I shared some of the challenges we face in the website security domain pertaining to the subject.

The idea of Defense in Depth is simple: employ as many complementary defensive controls as makes sense for you and your organization. The optimal word being “complementary”. It’s based on the idea that every tool has a weakness, so find tools that help address them and that work in unison with one another. This does not mean you deploy every tool available, instead you must strategically map out the threats that you are most concerned with, that pose the biggest impact to your organization, and prioritize your defensive posture.

Today’s threats are evolving at a faster clip than any one solution or team can account for. It’s not a matter of finding the 100% solution, but about deploying the things we need to help reduce the growing risk. This has never been truer than in the website security domain. If employed correctly we should be better prepared to quickly identify issues, mitigate the threats and respond to incidents if so required. Attackers only need to win once. As defenders, we have to win every time.

How To Protect Your Business Data

Published in Security on September 17, 2016

It’s impossible to go a week without seeing some reference to a data breach, whether it’s a write up on what happened years ago, or updates on breaches that are still happening. The two breaches I found most interesting where a treasure trove of business data (not credit card data) was exfiltrated, and subsequently released would have to be the 2014 Sony Hack and more recently the Panama Papers hack. With this in mind, there has never been a better time for more discussion around how we think about data protection in our businesses than now.

I am partial to these hacks because as a business owner, especially one in the website security industry, the threat of a compromise is very real. We work under the guise that someone is always watching and the fact that a compromise is inevitable. As such, a lot of what we do is about minimizing the exposure and impact when it happens. There are many ways to do this as well as many areas to focus on, but one particular domain for us is the protection of the data that keeps our company going.

Impacts of a Website Compromise

Published in Security on April 15, 2016

The threats of a compromise are real, and are not specific to operating an online store. Attackers find value in a number of things, some of which include your audience and resources. In this webinar I spend some time exploring a number of the impacts we should all be aware of as website owners.

I recently gave a webinar at Sucuri in which I discuss the impacts hacks have on you as website owners. In this session I dive into three core areas:

Psychology of the Attackers.
Things they can do if successful.
Impacts to you as a website owner.

If you are currently infected, or know of someone that is, I encourage you to learn more about Sucuri and how they can help!

WordCamp US 2015: Navigating Today’s Website Threats!!

Published in Security on February 17, 2016

Recently I spoke at WordCamp US 2015 on the topic WordPress Security — Navigating Today’s Website Threats!!

WordPress is one of the most recognized website CMS platform available in the market. Dominating over 25% of the websites on the web, and over 50% of the CMS-based websites, it’s no surprise that it’s the preferred technology by marketers, sales professionals, small and large business alike, and those intent on nefarious actions.

Security In Open-Source CMS Applications

Published in Security on February 12, 2016

Open-source CMS applications are no stranger to the battle they face with security. The size of the organizations adopting the platform also has little to do with it – from bloggers to mom and pop shops to Fortune 500 companies; the concern is the same. Can open-source CMS applications be deployed securely within their respective stacks?

There are those that look at open-source and have a general distrust for it. The idea that people can see the code and submit patches makes them uneasy. There are also those who can’t get their head around the general ambiguity of open-source, in which the code belongs to no-one and everyone. What they don’t realize is that most open-source projects have a stringent commit process.

The security perception is still a very real problem for the open-source CMS industry, and many feel it’s unattainble.

How To Encrypt Gmail Emails Using Mailvelope

Published in Security on January 2, 2016

Over the past couple of years we’ve been reminded time and time again of how susceptible our communication mediums are to prying eyes. Classic examples of its susceptibility can be seen in the very public disclosure of General Petraeus affair in 2012, the release of over 170,000 emails after the Sony compromise in 2014, to the recent Ashley Madison compromise in which the CEO’s emails were shared publicly in 2015.

In either case, the information gleaned from these emails were damaging at best, and destructive at worst. In either case, what we should take away from it is that how and what we say, even if in what we perceive to be secure, is not necessarily the case.

Emails are a treasure trove of information, and as such we should all be spending a bit more time thinking of not only what we say, but how we keep what we say safe from prying eyes.

Website Security is Not an Absolute

Published in Security on October 31, 2015

I work in the field of Information Security (InfoSec), specifically website security. With that in mind, it’s but one very small piece of a very large pie. Security is complex, even at the 50,000 foot level; within each specific area of the industry, it can get even more complex. It’s no wonder it can feel overwhelming.

I have to remind myself that Security, regardless of which domain you’re focused on, always comes down to three basic elements working in conjunction with one another:

People
Process
Technology

Updating Permalinks in Ghost

Published in Security on December 8, 2014

When I think about blogging, there is perhaps no more important feature or concern than impacts to SEO. It’s perhaps one of the biggest concerns many will likely experience when performing a migration to the Ghost blogging platform.

I recently migrated my personal blogs to this platform and share some insights into the installation process in case you want to give it a go.

As you might expect, it’s had it’s up’s and down’s, much like when I first got started with WordPress. Needless to say, I’ve been making my way through it over the past few days. I’ve learned a number of things, and one such thing pertains to permalinks.