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Debian LTS Advisory DLA-2490-1                [email protected]
https://www.debian.org/lts/security/                    Thorsten Alteholz
December 10, 2020                             https://wiki.debian.org/LTS
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Package        : x11vnc
Version        : 0.9.13-2+deb9u2
CVE ID         : CVE-2020-29074

Guenal Davalan reported a flaw in x11vnc, a VNC server to allow remote 
access to an existing X session. x11vnc creates shared memory segments 
with 0777 mode. A local attacker can take advantage of this flaw for 
information disclosure, denial of service or interfering with the VNC 
session of another user on the host.

For Debian 9 stretch, this problem has been fixed in version

We recommend that you upgrade your x11vnc packages.

For the detailed security status of x11vnc 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