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You must prevent malware hidden in image files. Which server-side check gives the best practical protection

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You must prevent malware hidden in image files. Which server-side check gives the best practical protection

Only check file extension.

Validate MIME type from client-supplied headers.

Rely on antivirus scanning only.

Inspect file “magic bytes” / file signature and re-encode images server-side.

This question is part of this quiz :

Cyber Quiz Day 35
Tags:
Ethical Hacking
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