rubygem-paperclip -- validation bypass vulnerability

ID 0F154810-16E4-11E5-A1CF-002590263BF5
Type freebsd
Reporter FreeBSD
Modified 2015-06-05T00:00:00


Jon Yurek reports:

Thanks to MORI Shingo of DeNA Co., Ltd. for reporting this. There is an issue where if an HTML file is uploaded with a .html extension, but the content type is listed as being image/jpeg, this will bypass a validation checking for images. But it will also pass the spoof check, because a file named .html and containing actual HTML passes the spoof check. This change makes it so that we also check the supplied content type. So even if the file contains HTML and ends with .html, it doesn't match the content type of image/jpeg and so it fails.