Debian 10 Buster DLA-3310-1 Critical: Xorg-Server Local Escalation

Jan-Niklas Sohn, working with Trend Micro Zero Day Initiative, discovered
a vulnerability in the X.Org X server.
A potential use after free mighty result in local privilege escalation if
the X server is running privileged or remote code execution during ssh X
forwarding sessions.


For Debian 10 buster, this problem has been fixed in version
2:1.20.4-1+deb10u8.

We recommend that you upgrade your xorg-server packages.

For the detailed security status of xorg-server please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/xorg-server

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS