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.
mdeslaurfixing this in stable releases would result in the user getting
an unexpected "Untrusted application launcher" dialog on existing
.desktop files. Dialog changes would also need new translations.
Upstream:released (3.23.90)
Ubuntu 12.04 ESM (Precise Pangolin):DNE
Ubuntu 14.04 ESM (Trusty Tahr):DNE (trusty was needed)
Ubuntu 16.04 LTS (Xenial Xerus):needed
Ubuntu 18.04 LTS (Bionic Beaver):not-affected (1:3.26.0-0ubuntu1)
Ubuntu 20.04 LTS (Focal Fossa):not-affected (1:3.26.0-0ubuntu1)
Ubuntu 20.10 (Groovy Gorilla):not-affected (1:3.26.0-0ubuntu1)
More Information

Updated: 2020-09-09 21:24:23 UTC (commit b67d7d8b03f173f825cd706df5bd078bca500b0e)