We see a lot of our customers forwarding their AWS logs to a SIEM, which is what we use to query and spot Amazon S3 bucket misconfigurations. How to detect, investigate and respond to Amazon S3 alerts There are lots of ways that S3 buckets can become public. Or maybe the bucket was never configured properly in the first place. Or perhaps a team member was testing different permissions but they were never reverted. For example, think about an engineer who’s trying to test something and assigns a bucket to “AuthenticatedUsers” so her new teammate can get quick access to it … but then forgets to change the settings back. Well-meaning users is another common way that data stored in S3 buckets becomes public. So when Joe over in IT accidentally gives “AllUsers” access to the company directory and unwittingly exposes it to anyone with an internet connection, it doesn’t mean he’s a dummy. Developers and IT admins have grown up in an (on premise) world where groups with “users” in the name are limited to only the employees in their organization. It’s easy to see how this can cause confusion - especially if you’re new to cloud. The “AllUsers” group consists of anyone in the world - and ya can’t get much more public than that. S3 buckets become public when any permissions are granted to the predefined groups “AuthenticatedUsers” or “AllUsers.” The “AuthenticatedUsers” group represents all AWS accounts, meaning anyone with an AWS account can access that S3 bucket. Let’s tackle the tricky naming convention first. The short answer? Confusing naming and well-meaning users. Why do Amazon S3 buckets often wind up public? Understanding a few details about S3 buckets - along with some red flags to look out for when users inevitably make them public - can go a long way towards keeping your org safe. The potential for exposing data through public S3 buckets will always be a risk (even if it’s unintended), but there are a couple steps you can take to quickly identify public-facing S3 buckets and reduce your risk of an incident. S3 buckets don’t allow public access by default, so if a bucket becomes public, it means a user made a change somewhere along the way. You can also adjust the access permissions policies for the bucket and all the data contained in it (more info on all of that right here). When you create a new Amazon S3 bucket, you’ve got to set a bunch of configurations and settings. You can even host a website using Amazon S3, and store all the elements on said website in a bucket. They can be used to store images, videos, websites, backups, new application builds or really anything you want. What’s Amazon S3, why do these breaches happen and how can you protect your own org from making this mistake? We’re laying out all the details for you below.Īmazon S3 (“S3” stands for “Simple Storage Service,” BTW) buckets are basically the equivalent of hard drives in the sky. One of the most common errors that’s been popping up in the news and which we’ve started to see here at Expel is when users accidentally make Amazon S3 buckets public. While they mean well, these errors can (and do) inadvertently put their organization at risk. So we often see security incidents happen that are simply errors made by well-intending employees. One of the biggest challenges we see with cloud security is that people are unpredictable and prone to, well … ya know, being human. Why? We’ve talked about a few reasons here, but the TL DR is that your users are the new endpoints. In short, that same security playbook you were using to chase down alerts on your network, laptops and servers isn’t always going to work once you’ve lifted that data into the cloud. And while there are plenty of benefits of using the cloud, there are also unique security concerns that organizations need to be aware of. For any bucket that is CORS configured and public, child buckets inherit all settingsįor more AWS documentation, please visit their support site.Many of our customers run at least part of their infrastructure in public cloud environments, like Amazon Web Services (AWS), Google Cloud or Microsoft Azure.If desired, expiration times can be added to images.Keep image names and buckets anonymous as the generated links will show the file path.To CORS configure the bucket scroll all the way down to the "Cross-origin resource sharing (CORS)" section and click 'Edit': If you need to Edit the permissions, click 'Edit'. To make images public, go to the Permissions tab and ensure ”Block all public access" is "Off". You will now see a list of buckets you have access to in your account This guide outlines the general steps to CORS configure your data to be pulled into the platform to be successfully used with our tool. When creating a pixel labeling job for semantic segmentation you’ll need to host your own data in a CORS configured S3 bucket in order to utilize the Superpixels and Magic Wand tools.
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