To minimize risk, all files should be scanned for malware. Therefore, it is important to verify file types before allowing them to be uploaded.ģ. docx, and your solution relies entirely on the file extension, it would bypass your check as a Word document which in fact it is not. For instance, if an attacker were to rename an. In addition to restricting the file types, it is important to ensure that no files are ‘masking’ as allowed file types. By limiting the list of allowed file types, you can avoid executables, scripts and other potentially malicious content from being uploaded to your application.Ģ. To avoid these types of file upload attacks, we recommend the following ten best practices:ġ. If an extremely large file is uploaded, this could result in high consumption of the servers’ resources and disrupt the service for your users.Malicious content – If the uploaded file contains an exploit, malware, malicious script or macro, the file could be used to gain control of infected users’ machines.Malicious content – If the uploaded file contains an exploit or malware which can leverage a vulnerability in server-side file handling, the file could be used to gain control of the server, causing severe business consequences and reputational damage.This could cause the website to no longer function, or it could compromise security settings to allow attackers to upload additional malicious files and exploit you for ransom.
replace htaccess file), the new file can potentially be used to launch a server-side attack. If the file that was overwritten is a critical file (e.g.
For instance, file uploads are an important function for content management systems, healthcare portals, insurance sites, and messaging applications. File uploads are essential for user productivity and many business services and applications.
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