Bug#972146: /usr/share/applications/mono-runtime-common.desktop: should not handle MIME type by executing arbitrary code

[Gabriel Corona]

As a workaround, you should be able to disable this feature (and have 
the fix persist after a package update) with something like:

mkdir -p /usr/local/share/applications
cp /usr/share/applications/mono-runtime-*.desktop 
/usr/local/share/applications
sed -i 's/^Exec=.*/Exec=false/' 
/usr/local/share/applications/mono-runtime-*.desktop

Regards,

Gabriel