To protect your home from thieves, the easiest thing you can do is lock your windows and doors every time you leave the house. Similarly, in cybersecurity, the easiest way to protect your network is to keep your hardware and applications up to date with the latest security patches.
But how do you defend against a vulnerability you don’t know is a vulnerability in the first place? Welcome to the conundrum of zero-day exploits.
A zero-day exploit is like a burglar who finds where you hide your spare key—they can now access your house at any time. It’s only after you find all your stuff missing that you realize what happened and change the locks.
What Is a Zero-Day Exploit?
A zero-day exploit is an undisclosed vulnerability in your hardware, software, or network that has been exposed with no current remedy. Sometimes, cybercriminals launch an attack on a security vulnerability on the same day it’s been publicized; other times, the vulnerability itself isn’t exposed until the first attack takes place.
While developers are working on a patch, hackers enjoy free reign to exploit the vulnerability at will. You can see why they call it a zero-day exploit because “zero days” is about the amount of time the developer has to fix the problem before a complete catastrophe.
To start, a developer has to develop and release a patch. The patch then has to be downloaded and installed on vulnerable devices. For an exploit targeting a commonly-used application—or for an organization with thousands of devices—it can take hours, days, or even weeks to become fully protected.
In the meantime, hackers are stealing data and exploiting additional malware without your knowledge.
Zero-day exploits can take any form, such as a virus, ransomware, or Trojan. They can be found and exploited by a lone hacker or used by criminal organizations as part of a widespread attack. Because it can infect devices through normal activities like web browsing, opening an email, or launching a file, users often don’t even realize they’ve been attacked.
Zero-Day Exploits in the News
In 2017 hackers used a zero-day exploit to attack a flaw in Microsoft Word to deploy a remote access Trojan that could secretly collect information like emails and login information.
In 2014 hackers exploited a previously undisclosed vulnerability during a spear-phishing email campaign to unleash a devastating attack on Sony Picture Entertainment’s computer network. The attack crippled the network while releasing the personal emails of top executives, business information, and even copies of unreleased films.
How to Defend Against Zero-Day Exploits
While the best protective measures and most sophisticated AI/machine-learning solutions can’t protect your business completely from a zero-day attack, many of the same cybersecurity best practices are useful for protecting against zero-day exploits. This includes:
LEARN MORE: A SOC-as-a-service can help you stay protected against known vulnerabilities and the unknown risks of zero-day exploits by providing the dedicated services and security experts you need to prevent, protect, and respond to threats in your environment. Learn how a SOC-as-a-service can help protect your organization.