etc/initsystem/prepare-dirs in Icinga 2.x through 2.8.1 has a chown call for a filename in a user-writable directory, which allows local users to gain privileges by leveraging access to the $ICINGA2_USER account for creation of a link.
{ "binaries": [ { "binary_name": "icinga2", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "icinga2-bin", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "icinga2-classicui", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "icinga2-common", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "icinga2-ido-mysql", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "icinga2-ido-pgsql", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "icinga2-studio", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "libicinga2", "binary_version": "2.4.1-2ubuntu1" }, { "binary_name": "vim-icinga2", "binary_version": "2.4.1-2ubuntu1" } ] }
{ "binaries": [ { "binary_name": "icinga2", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "icinga2-bin", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "icinga2-classicui", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "icinga2-common", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "icinga2-ido-mysql", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "icinga2-ido-pgsql", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "icinga2-studio", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "libicinga2", "binary_version": "2.8.1-0ubuntu2" }, { "binary_name": "vim-icinga2", "binary_version": "2.8.1-0ubuntu2" } ] }