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[Thomas Mayer <1401454@xxxxxxxxxxxxxxxxxx>]

I was wrong. Not overwrite, just read. Which makes it even less probable
to break things.

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https://bugs.launchpad.net/bugs/1401454

Title:
  Thunderbird writes attachments to /tmp readable to everyone

Status in Mozilla Thunderbird Mail and News:
  Confirmed
Status in thunderbird package in Ubuntu:
  Confirmed

Bug description:
  When I open an attachment of an email in Thunderbird it gets written
  to disk with permission 644, so it is readable by everyone on the
  system.

  How to repeat: Open an E-Mail, Open an Attachment (e.g. google.png)

  $ cd /tmp; ls -lh
  -rw-r--r-- 1 theuser thegroup 2,4K Dez 11 10:39 google.png

  Instead, Thunderbird should write the file with permissions 600. Plus,
  to avoid conflicts between users, the file should be written into a
  directory per user, e.g. /tmp/theuser/google.png or another user
  specific temp directory.

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