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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Tips for Secure File Uploads with ColdFusion
Chances are your web server is also capable of limiting the post size, on apache you can use the LimitRequestBody directive to do this. Upoad default behavior of the file upload should be to delete the file if it does not pass a validation check.
It’s best to strip out non alpha numeric characters perhaps with the exception of dash and underscore. Use you should limit your uploads directory to only allow static files to be requested. Upload to a static content server If possible upload content to a server other than the application server, a server that only serves static content for example Amazon S3.
You can effectively disable CF from ever executing from that folder with the right application logic. OS permissions allow only the project owner to write, any can read. TimeCreated Time the uploaded file was created. For more information, see Usage. But I was told I should not even allow user’s file to reach our server.
The file status parameters can be used anywhere other ColdFusion parameters can be used. Individual attributes must be specified explicitly. I’m comforted by the fact that I tend to follow all suggestions you’ve made, with the exception of a static content server.
See Mark Kruger’s blog entry for details. Example The following example creates a unique filename, if there is a name conflict when the file is uploaded on Windows: They may not work, and may cause an error, in later releases. Nebu 4 This variable includes the file length plus the length of any other request content.
Now CFMX code can scan the backend directory and authorize what the user can see. OldFileSize Size of a file that was overwritten in the file upload operation.
I’m revisiting an app that allows customer file uploading, and one approach I’m considering is using CreatUUID to generate a server side file name and stick the customer provided filename in a related database entry going through cfqueryparam, of course.
David has contributed to several open source ColdFusion projects and frameworks, along with the blog he maintains www. The following examples show the use of the mode attribute. When user upload non text file they’ll get the error saying: Filename of the file actually saved on the server. The name of the variable in which the file upload errors will be stored.
Jamie thanks, yes that is worth noting. ClientFileName Filename without an extension of the uploaded file on the client’s system. In this example, the specified destination directory is “uploads. You can set a maximum file size but this is processed during the upload. The result attribute allows functions or CFCs that get called from multiple pages at the same time to avoid overwriting the results of one call with another.
If possible keep uploaded files outside of the web root and serve them with cfcontent. You may also choose to employ a check of the file extension as an added layer of error checking.
Upload the file to a temp folder that is not under the root dir verify the file extension change the file name even if the extension is detected to be a. A trailing slash must be included in the target directory when uploading a file.
Date and time of the last modification to the uploaded file. If all is well, then the suggestions offered here would be good!
Since strict is true by default, you should specify MIME types for the accept attribute. Useful Very Useful Not Useful. He has been developing with ColdFusion since version 4 and is an active member of the ColdFusion community. This should do it but unfortunately on my test when I tried uploading non text file I got ColdFusion error:. Does anyone have any suggestions for virus scanning on ColdFusion file uploads? When I upload files, there are two things I always to before it gets to the action page or code block.
What is not shown through the code sample above is processing the upload through any type of virus scanner or any additional file size checks that could be done beyond the post limit size set in ColdFusion Administrator or through the web server configuration. Joe C 2, 13 Do not use pound signs to specify the field name. Email Required, but never shown. On Cfile systems should also restrict access to the uploaded file by specifying the mode attribute, preferably so that only the Uploadd process can read or write to the file.
The first and most important thing is that files should NEVER be uploaded to a web accessible directory.