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The dangerous, exquisite art of safely handing user-uploaded files
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lca
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lca2017
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Next: 12 The Vulkan Graphics API - what it means for Linux
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Marks
Author(s):
Tom Eastman
Location
Wellington Room 1
Date
jan Tue 17
Days Raw Files
Start
22:40
First Raw Start
22:16
Duration
0:45:0
Offset
0:23:33
End
23:25
Last Raw End
23:21
Chapters
00:00
0:05:59
0:35:59
Total cuts_time
38 min.
http://linux.conf.au/schedule/presentation/169/
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Every web application has an attack surface -- the exposed points of interaction where a malicious or mischievous user can commit malice, or mischief (respectively). Possibly nowhere, however, is more vulnerable than places a user is allowed to upload arbitrary files. The scope for abuse is eye-widening: The contents of the file, the type of the file, the size and encoding of the file, even the *name* of the file can be a potent vector for attacking your system. The scariest part? Even the best and most secure web-frameworks can't protect you from all of it. In this talk, I'll show you every scary thing I know about that can be done with a file upload, and how to protect yourself from -- hopefully -- most of them.
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