Writing a script letting us upload files might be relatively easy, but the security of such an approach is a different beast altogether – this is what we explore in this blog.
File uploading functions are a necessity for many applications that let users interact with other users in a commercial fashion: think of businesses running classifieds sites, for example. Many of such enterprises encompass a couple of business lines – some of them deal with real estate, automobiles, employment, and general classifieds sites. For many such businesses, file uploading functions are an absolute necessity to drive revenue – users must upload text, images, and descriptions of a certain product.
The security of file upload functions is an absolute must for every business – it’s easy for such a feature to slip out of hands, and as it’s sometimes built while neglecting basic concepts, the consequences for some businesses are terrific – when exploiting improperly built functions, hackers upload malicious files, implement backdoors, deface websites, and sometimes cause a lot of downtime. There’s an easy way to prevent all of this from happening – we need to secure all of our forms that let people upload files onto any server.
To protect our applications from the aforementioned threats, we need to ensure that:
These three points will take care of three crucial problems:
To add to the last point, we should consider disabling PHP from running inside of the folder that uploaded files reside in entirely for maximum security – simply add this code snippet inside of your .htaccess file to achieve that:
Image 1 – .htaccess code to prevent the execution of PHP files
Once that‘s done, we should build our PHP file-uploading script. Here‘s a basic form of such an approach:
Follow the outlined steps together with the advice outlined above, and you should be good to go.
Handing uploaded files on the server side when using PHP might not be the simplest of tasks, however, it can be done once we have some security knowledge in this space. We hope that this blog has been helpful and you will consider staying around the BreachDirectory space for more content – make sure to run a search through the search engine and consider implementing the API offering into your infrastructure to secure both yourself and your employees, and until next time.
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