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[Tips] C# determines whether the uploaded file is an image and prevents Trojan horse uploads

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Posted on 3/14/2019 5:26:59 PM | | |
Method 1: Use the image object to determine whether it is an image

Method 2: Judge the file header

It is said that method 2 is effective for conventional modification of Trojans, that is, directly modifying the extension, such as changing the .asp to .jpg. But it doesn't work for the kind of Trojan that is generated. I recommend everyone to use the first one.




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 Landlord| Posted on 3/14/2019 9:53:46 PM |


That's it. After verifying the header information of the file, of course, the production of the Trojan horse can also add the header information and still upload successfully, at this time it should be necessary for our server to control the permission to upload the file.


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