GNOME Nautilus before 3.23.90 allows attackers to spoof a file type by
using the .desktop file extension, as demonstrated by an attack in which a
.desktop file's Name field ends in .pdf but this file's Exec field launches
a malicious "sh -c" command. In other words, Nautilus provides no UI
indication that a file actually has the potentially unsafe .desktop
extension; instead, the UI only shows the .pdf extension. One (slightly)
mitigating factor is that an attack requires the .desktop file to have
execute permission. The solution is to ask the user to confirm that the
file is supposed to be treated as a .desktop file, and then remember the
user's answer in the metadata::trusted field.
 mdeslaur> fixing this in stable releases would result in the user getting
 mdeslaur> an unexpected "Untrusted application launcher" dialog on existing
 mdeslaur> .desktop files. Dialog changes would also need new translations.
Upstream:released (3.23.90)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):needed
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (1:3.26.0-0ubuntu1)
Ubuntu 18.10 (Cosmic Cuttlefish):not-affected (1:3.26.0-0ubuntu1)
Ubuntu 19.04 (Disco Dingo):not-affected (1:3.26.0-0ubuntu1)
More Information

Updated: 2019-01-14 21:24:03 UTC (commit 51f9b73af244ba86b9321e46e526586c25a8e060)