Secure File Upload in PHP Web Applications

PHP File, PHP as a shell and execute arbitrary commands on the server …… If you try to download file with php extension, is controversial: ….

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Secure File Upload in PHP Web Applications
Introduction…3
Naive implementation of file upload…3
Content-type verification…5
Image file content verification…8
File name extension verification…12
Indirect access to the uploaded files…15
Local file inclusion attacks…16
Reference implementation…17
Other issues…19
Conclusion…19

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