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How To: Buy Used Phones Without Getting Screwed

I've seen my fair share of heartbreaks when it comes to used phones. As a repair tech, I often had to try and help out customers who bought used handsets which turned out to be useless, either because it was stolen or not working on their carrier's network. More often than not, there was very little I could do. To help you from being stuck in the same situation, here are some tips to prevent you from getting scammed out of your hard earned money when buying a used handset.

How To: Use UFONet

With the release of the Mirai source code, botnets are back in a big way. In the early days of botnets, zombies (infected hosts) would report to IRC (Internet Relay Chat) channels for CNC (command and control) instructions. Modern botnets have evolved, but they continue to use the same concepts as their predecessors.

How To: Build a Directory Brute Forcing Tool in Python

While attempting to hack a web app, there may come a point where the attacker may have to escape the default directory in order to access unauthorized files. This is known as a directory traversal attack. Much as the name implies, this attack involved traversing the servers directories. But in order to move to an unauthorized directory, we need to know where those directories are. Today we'll be building a tool to brute force these directory locations based on HTTP response codes. Before we g...

How To: Security-Oriented C Tutorial 0x08 - A Trip Down Memory Lane

Before I continue with a topic on strings, we first require some fundamental understanding of how memory works, i.e. what it is, how data looks in memory, etc. as this is crucial when we are analyzing vulnerabilities and exploitation. I highly suggest that your mind is clear and focused when reading the following article because it may prove to be confusing. Also, if you do not understand something, please verify all of your doubts, otherwise you may not completely understand when we touch on...

News: Here's Everything You Should Know About Samsung Pay

Mobile payment systems have been around for almost 5 years now, starting with Google Wallet. But when Apple got into the game last year with their new Apple Pay service, things really started to take off. Around this time, Samsung responded by acquiring an up-and-coming mobile payments company that owned the rights to an incredibly innovative technology called Magnetic Secure Transmission (MST).

How To: Linux Basics Tips

Hi nullbytes! I've been recently reading the whole Linux Basics for the Aspiring Hacker series and felt like it was missing some stuff I know, so I felt like sharing it with anyone who might find it useful too.

How To: Use Social Engineering to Hack Computers

Today I am going to teach the various ways that you can use social engineering to hack a system. For those of you that have followed my past tutorials, you know that social engineering can unlock a world of possibilities. This is because no matter how many firewalls, no matter how many patches there are on a server, the password is kept in the minds of people...and people, are not as smart as computers.

How To: Root the Nexus Player

UPDATE NOVEMBER 2015: The root process has changed for the Nexus Player now that the device is running Android 6.0 Marhsmallow. I've updated this article with detailed instructions on the new root process, but the video below still depicts the old process for Android Lollipop.

How To: Install TWRP Recovery on Your Samsung Galaxy Note 3 (Sprint or T-Mobile)

As we near the one-year anniversary of its release (and the inevitable unveiling of its successor), the Samsung Galaxy Note 3 remains a device that packs quite a punch when it comes to hardware. It boasts a 2.3Ghz CPU and was the first mobile phone ever to house 3GBs of RAM. Suffice it to say, it can handle any software you throw at it with no discernible lag. Even Samsung's notoriously bloated TouchWiz ROM seems lightning fast.

Hack Like a Pro: How to Hijack Software Updates to Install a Rootkit for Backdoor Access

Welcome back, my neophyte hackers! There are innumerable ways to hack a system. We must not overlook any of the possibilities if we want to "own" the system. As systems become more and more secure, we need to be vigilant in our search for weaknesses. In this hack, we'll look at abusing the trust that a user innately has for software updates to install our own listener/rootkit on their system.

How To: Stay as Anonymous as Possible Online

There are lots of people who want to stay anonymous online, and lots of reasons they want to do this. Staying anonymous on the internet isn't easy, and it's probably possible to trace almost anyone with enough time and resources. A lot of people think that they're completely secure with just one method of cover. For example, a lot of people thought anyone using the Tor network was nearly untraceable, but then things like this often cast doubt on just how secure these networks are. Unless you ...

How To: Crack SSH Private Key Passwords with John the Ripper

Secure Shell is one of the most common network protocols, typically used to manage remote machines through an encrypted connection. However, SSH is prone to password brute-forcing. Key-based authentication is much more secure, and private keys can even be encrypted for additional security. But even that isn't bulletproof since SSH private key passwords can be cracked using John the Ripper.

How To: Get the Most Value from Your iPhone Trade-In

Phones these days are expensive. The iPhone 11 Pro is presumed to start at $999, following the iPhone XS and iPhone X's leads. One way to bring down that cost is to trade in your old iPhone, but there isn't one clear-cut way to do that. You could trade your iPhone into a participating website or put yourself out there and sell the iPhone on your own. It's all about what's best for you.

Locking Down Linux: Using Ubuntu as Your Primary OS, Part 3 (Application Hardening & Sandboxing)

Once you've installed Ubuntu with security in mind and reduced the possibility of network attacks on your system, you can start thinking about security on an application level. If a malicious file is opened on your system, will an attacker be able to access every file on the computer? The chances are much slimmer if you put the proper defenses in place.

How To: Remove or Add 'Where from' Metadata in Files on macOS

When you download files from certain apps like Safari and Chrome on your Mac, those files are tagged with the "Where from" metadata attribute. Depending on where the file was downloaded from, this attribute may refer to the host's URL, a sender's email address, or another piece of identifying information. While not obvious, you can delete or even change this attribute.

How To: Remove Background Telemetry Services on Your OnePlus to Stop Unnecessary Data Collection

Your phone tracks your every move to some extent, and I'm not just talking about Google services. Smartphone manufacturers use telemetry services that run in the background to track how you use the device, mostly for ads or to improve their future products. You don't usually have a say in the matter, but if you have a rooted OnePlus, there's a way you can take control over it.

News: Apple Releases iOS 13.7 Beta, Includes Exposure Notification Support Without Needing an App

The iOS 14 beta may be picking up steam, but the iOS 13 beta program isn't out for the count. With the release of the iOS 13.7 beta, build 17H33, Apple has included API changes for the COVID-19 Exposure Notifications setting. The update makes it possible for public health authorities to let iPhone users get coronavirus exposure alerts without installing their state's app.

How To: Apps & Services May Have Access to Your Apple Music & Media Library — Here's How to Check & Revoke Their Permissions

Third-party apps on your iPhone must ask for your permission to access your library in the Music app. Some will even want to get access to your Apple Music account. If you no longer use the apps, you shouldn't be letting them have access anymore. It's easy to hunt them down, and doing so might even show some apps you can't even remember giving any permissions to.