Debian DSA-4328-1 Critical Xorg-Server File Overwrite And Escalation

Narendra Shinde discovered that incorrect command-line parameter
validation in the Xorg X server may result in arbitary file overwrite,
which can result in privilege escalation.

For the stable distribution (stretch), this problem has been fixed in
version 2:1.19.2-1+deb9u4.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/