Debian LTS 9: DLA-2451-1 Critical: libvncserver Denial of Service

An issue has been found in libvncserver, an API to write one's own VNC
server.
Due to some missing checks, a divide by zero could happen, which could
result in a denial of service.


For Debian 9 stretch, this problem has been fixed in version
0.9.11+dfsg-1.3~deb9u6.

We recommend that you upgrade your libvncserver packages.

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

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