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.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0856
Reference (s):
- BID:77099
- URL: http://www.securityfocus.com/bid/77099
- https://github.com/sddm/sddm/commit/4cfed6b0a625593fb43876f04badc4dd99799d86
- https://github.com/sddm/sddm/wiki/0.13.0-Release-Announcement
- FEDORA:FEDORA-2015-9f996ea146