Contents
How to securely allow users to upload files?
Just because your files are stored outside of the document root doesn’t mean you can’t give your users access to them. You could, for example, forward the files to a static content server incapable of executing dynamic content (an Apache server without mod_php) or a third-party service (e.g. Cloudinary).
What should I do when I upload a file?
All uploaded files should be scanned by antivirus software before they are opened. The application should not use the file name supplied by the user. Instead, the uploaded file should be renamed according to a predetermined convention.
How to upload an EXE file to email?
Now move to the “Upload” section and click on the “Select files from your computer” button to select the exe file on your PC (you can drag-and-drop as well). 3. Afterward, click on the “Upload” button below and the exe file will be added as a link in the email.
Can a malicious user upload a malicious file?
Malicious file uploads. An ordinary user may use the facility to upload the type of files expected. However, an attacker could take advantage of the facility with malicious file uploads. There are two fundamental ways a website can be attacked by a file upload. The first way involves the type of file uploaded.
How can a website be attacked by a file upload?
There are two fundamental ways a website can be attacked by a file upload. The first way involves the type of file uploaded. A file could overwrite another file that already exists with the exact same name on the server. If this were a critical file, the new file could cause the website to function incorrectly, or not at all.
What are the security implications of file uploads?
The ability to upload files on a website is a common feature, often used to enable users or customers to upload documents and images. While this is useful in many situations, the security implications of hosting a file-upload facility are significant. Here are some file upload security best practices.