daemon/Greeter.cpp in sddm before 0.13.0 does not properly disable the KDE crash handler, which allows local users to gain privileges by crashing a greeter when using certain themes, as demonstrated by the plasma-workspace breeze theme.
| Software | From | Fixed in |
|---|---|---|
| fedoraproject / fedora | 22 | 22.x |
| sddm_project / sddm | - | 0.12.0.x |