Alpine Linux: CVE-2020-28049: sddm local privilege escalation due to race condition in creation of the Xauthority file
Description
An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.
Solution(s)
- alpine-linux-upgrade-sddm
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