I am wondering if there is a safer way to use ColdFusion CFFILE to upload files to Of course, you only perform the image tests if the file uploaded is an image. You may want to use a third party tool like Alagad Image CFC or ColdFusion 8’s built in image support to not only confirm that the file is indeed. On UNIX systems should also restrict access to the uploaded file by specifying the mode attribute, preferably so that only the ColdFusion process can read.
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I’ve tried to use file. When TXT is detected, I’m showing a pop up error message to users and delete the file. But I was told Ipload should not even allow user’s file to reach our server.
This should do it but unfortunately on my test when I tried uploading non text file I got ColdFusion error:. Verify that you are uploading a file of the appropriate type.
I tried to use cftry and cfcatch but I still get the same error, this mainly due to the MIME Type that I don’t know when the file is being uploaded by the browser. I also found the same question in this forum and tried the suggested answer, it did not work, still got the same error message see below. I also found another posting in this forum that do not suggest the use of CF “accept” attribute. This link is provided for a further detail explanation: So my question is, since I’m still using CF8, I actually don’t have many options to prevent my users from uploading other than.
ColdFusion Help | cffile action = “upload”
Even if I do these steps, I have to allowed the file to reach our server, the fffile is to NOT allow the file to reach our server. I think your steps are reasonable if you don’t like using the Accept attribute for validation.
FYI you can set accept to. The MIME type was determined by the client so it’s safer to check the extension anyway. The exception thrown by cffile failing uploae validation may not have a typeso the code you posted tried to detect it with FindNoCase by looking at the exception’s message.
You can dump the exception out and find out why the FindNoCase failed to catch the exception.
Make sure you treat whatever uploaded as something potentially malicious and do not process them e. Forcing the file extension to be. If you don’t want to trust the “accept” attribute, I would suggest allowing the user to upload the file and then checking the mime type of the uploaded file using the cffile.
You uploac also choose to employ a check of the cffie extension as an added layer of error checking.
But using a combination of checks you can be reasonably that most files uploaded are of the correct type. Coldfusion will not prevent a file from being onlyy to a server. You can set a maximum file size but this is processed during the upload.
The cffile tag kicks in after the file is uploaded. Furthermore it is rather difficult to really determine if a file is a text file or a cfffile, exe, rar etc file. In my opinion it is best to follow the tips given by pete freitag and use a java class to determine the file type. Then you can delete all non text files.
Tips for Secure File Uploads with ColdFusion
This should do it but unfortunately on my test when I tried uploading non text file I got ColdFusion error: I also found the same question in this forum and tried the suggested answer, it did not work, still got the same error message see below I also found another posting in cfile forum that do not suggest the use of CF “accept” attribute.
Upload the file to a temp folder that uplaod not onpy the root dir verify the file extension change the file name even if the extension is detected to be a. But it doesn’t work when I tested it: You can use the below code: Anit Kumar 1, 6 The question says that he does not trust the accept attribute. When user upload non text file they’ll get the error saying: The below code works for me: Joe C 2, 13 Nebu 4 Sign up or log in Sign up using Google. Sign up using Facebook.
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