![]() image upload, allow one type that is agreed upon to fit the business requirement.List Allowed Extensions ¶Įnsure the usage of business-critical extensions only, without allowing any type of non-required extensions. Refer to the Input Validation CS to properly parse and process the extension. Refrain from building your own logic unless you have enough knowledge on this topic. Generic bad regex that isn't properly tested and well reviewed. ![]() Double extensions, e.g.jpg.php, where it circumvents easily the regex \.jpg.Extension Validation ¶Įnsure that the validation occurs after decoding the file name, and that a proper filter is set in place in order to avoid certain known bypasses, such as the following: Implementing multiple techniques is key and recommended, as no one technique is enough to secure the service. Implementing a defense in depth approach is key to make the upload process harder and more locked down to the needs and requirements for the service. There is no silver bullet in validating user content. personal data, copyrighted data, etc.) which will make you a host for such malicious files. File content that could be deemed as illegal, offensive, or dangerous ( e.g.Requests are small, yet responses are much larger Initiate a DoS attack by requesting lots of files.If the file uploaded is publicly retrievable, additional threats can be addressed: Client-side active content (XSS, CSRF, etc.) that could endanger other users if the files are publicly retrievable.Overwrite an existing file on the system. VIRUSTOTAL UPLOADER HASH SEARCH FAILED ZIP
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