Malicious file execution occurs when websites and web applications are not properly validated. The user input on many web applications, which are designed and coded inadequately, may be exploited when malicious files are accessed and uploaded. These files will execute a malicious script at server-side and compromise the security of the web application.
Once the hacker has exploited the integrity of a website, it will become insecure and result in various security vulnerabilities.
The hacker may upload
May grant access or host other illegal software objects that will increase the chance of further security risks.
The hacker may gain control of the webserver and modify the website to remove useful pieces of data.
There are many other things that threaten the security of a website.
Users should always take necessary precautions to ensure the security of a website/web application.
Files should follow a specific naming convention so that no system files are overwritten and directories are in check.
Virus scan all uploaded files. Any failed scans of files should be blocked.
Determine what file extensions are being uploaded. Make sure that only necessary extensions can be uploaded and that only a limited amount of file types are authorized.
User Access levels should be incorporated to make sure that registered that users do not make use of unidentified access or a breach of privacy.
Make sure you have regular backups.
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