[Webkit-unassigned] [Bug 215842] New: Web Share allows for inadvertently sharing of local files

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215842

            Bug ID: 215842
           Summary: Web Share allows for inadvertently sharing of local
                    files
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tomac at google.com

Created attachment 407280

  --> https://bugs.webkit.org/attachment.cgi?id=407280&action=review

macOS Messages

Full credits: https://blog.redteam.pl/2020/08/stealing-local-files-using-safari-web.html

Below are the steps to reproduce the issue:

1. Visit https://overflow.pl/webshare/poc1.html using Safari or Mobile Safari 
2. Click “Share it with friends!”
3. Select the method (e.g. Mail, Messages)
4. “Send it” or “Share it” (or just inspect what has been attached)
5. Local /etc/passwd has been sent to the recipient

This works on both iOS (still as of iOS 14 beta 6) and macOS, tested on Safari Release 112 (Safari 14.0, WebKit 15610.1.25.5.1). 

Gmail (or Safari?) does some renaming of the shared file without user intervention (see https://user-images.githubusercontent.com/145676/91273520-ad247f80-e77d-11ea-973d-ebd2b4337bf7.png), whereas Messages and Mail seem to use the original file name.

Related spec issue: https://github.com/w3c/web-share/issues/173.

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