A novnc security update has been released for Debian GNU/Linux 9 LTS to address an issue where the remote VNC server could inject arbitrary HTML into the noVNC web page.

DLA 2854-1: novnc security update

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Debian LTS Advisory DLA-2854-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
December 27, 2021   https://wiki.debian.org/LTS
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Package : novnc
Version : 1:0.4+dfsg+1+20131010+gitf68af8af3d-6+deb9u1
CVE ID : CVE-2017-18635

An XSS vulnerability was discovered in noVNC, a HTML5 VNC client, in
which the remote VNC server could inject arbitrary HTML into the
noVNC web page via the messages propagated to the status field, such
as the VNC server name.

For Debian 9 stretch, this problem has been fixed in version
1:0.4+dfsg+1+20131010+gitf68af8af3d-6+deb9u1.

We recommend that you upgrade your novnc packages.

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

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