lightdm before 0.9.6 writes in .dmrc and Xauthority files using root permissions while the files are in user controlled folders. A local user can overwrite root-owned files via a symlink, which can allow possible privilege escalation.
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Lightdm | Lightdm_project | * | 0.9.6 (excluding) |
| Lightdm | Ubuntu | natty | * |
| Lightdm | Ubuntu | oneiric | * |
| Lightdm | Ubuntu | upstream | * |