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Debian LTS Advisory DLA-2869-1                [email protected]
https://www.debian.org/lts/security/                    Thorsten Alteholz
December 29, 2021                             https://wiki.debian.org/LTS
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Package        : xorg-server
Version        : 2:1.19.2-1+deb9u9
CVE ID         : CVE-2021-4008 CVE-2021-4009 CVE-2021-4011

Jan-Niklas Sohn discovered that multiple input validation failures in X 
server extensions of the X.org X server may result in privilege 
escalation if the X server is running privileged.

For Debian 9 stretch, these problems have been fixed in version

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:

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