[ASA-202011-8] sddm: privilege escalation
rgacogne at archlinux.org
Tue Nov 10 21:21:10 UTC 2020
Arch Linux Security Advisory ASA-202011-8
Date : 2020-11-10
CVE-ID : CVE-2020-28049
Package : sddm
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-1266
The package sddm before version 0.19.0-1 is vulnerable to privilege
Upgrade to 0.19.0-1.
# pacman -Syu "sddm>=0.19.0-1"
The problem has been fixed upstream in version 0.19.0.
A local privilege escalation has been discovered in the sddm display
manager < 0.19.0. If the auth file is empty, X allows any local
application (= any user on the system) to connect. This is currently
the case until X wrote the display number to sddm and sddm used that to
write the entry into the file.
A local user might be able to escalate privileges.
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