A zero-day vulnerability is a weakness that is unknown or unfixed as of today. When a hacker decides to attack this weakness, it’s called zero-day exploit.
After it becomes known, you can think of it as a one-day or 20-day exploit based on the time since initial discovery.
In 2017, the Equifax Data Breach exposed more than 140MM customer records and has cost the company over $1 billion. It was caused by a known exploit over two months old that could have been prevented with a simple update to Apache Struts.
Using packages with known vulnerabilities is the most common way hackers exploit web apps.
Audit your current NPM project using the audit command. Then update your dependencies as needed.
npm audit npm audit fix
A diagram of a typical Cross Site Scripting attack
<script>alert('you got got')</script>by submitting a comment via the web app.
In 2008, Heartland Payment Systems exposed the data encoded on credit cards via a SQL injection attack. The hackers used this data to make physical counterfeit credit cards. The ringleader, Albert Gonzalez, was caught and sentenced to 20 years in prison.
SQL injection is similar conceptually to XSS, but instead it runs malicious code on the database.
Notice how the code below relies on an external parameter to construct the query. If not not sanitized, an attacker can submit raw SQL code and the database will execute it.
"SELECT * FROM users WHERE uid='" + request.getParameter("uid") + "'";
Most ORMs will prevent SQL injection attacks because you do not construct the queries on your own. However, there have been hacks on ORMs directly, so again, nothing is 100% secure.
Many APIs and Cloud Providers provide API keys that allow you to interact with paid services. If a hacker discovers a secret API key it can be used to take destructive action on your behalf. There are a few ways credentials are leaked.
You can prevent credential leaks by NOT putting them in your source code. Instead, use environment variables or a service like Secret Manager.
In the event that your credentials are compromised, you can mitigate the damage by following the Principle of Least Privledge. Basically, this means grant access only when it is absolutely required.
A good example is Firestore Database Rules, which allow you to customize the permissions of an API key. When defining rules, you should always start by locking down everything, then selectively allow access as needed.
In 2018, Github survived the largest DDoS attack in history after it was bombarded with 1.35 terabits of data per second. It only took the site down for about ten minutes thanks to a backup service, Akamai, which re-routed traffic and blocked the spoofed requests.
A DDoS attack attempts to flood the a service with so much traffic that it simply shuts down. The attack is typically distributed via many spoofed sources, making it impossible to just block a single IP address.
For most developers, the best mitigation strategy is to use a large Cloud provider that has the bandwidth and monitoring capabilities to deal with such attacks.
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