A spice security update has been released for Debian GNU/Linux 9 LTS to address multiple buffer overflow vulnerabilities.

DLA 2427-1: spice security update

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Debian LTS Advisory DLA-2427-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
November 01, 2020   https://wiki.debian.org/LTS
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Package : spice
Version : 0.12.8-2.1+deb9u4
CVE ID : CVE-2020-14355
Debian Bug : 971750

Multiple buffer overflow vulnerabilities were found in the QUIC
image decoding process of the SPICE remote display system,
before spice-0.14.2-1.

Both the SPICE client (spice-gtk) and server are affected by
these flaws. These flaws allow a malicious client or server to
send specially crafted messages that, when processed by the
QUIC image compression algorithm, result in a process crash
or potential code execution.

For Debian 9 stretch, this problem has been fixed in version
0.12.8-2.1+deb9u4.

We recommend that you upgrade your spice packages.

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

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