A libvncserver security update has been released for Debian GNU/Linux 8 LTS to fix several vulnerabilities.

DLA 2264-1: libvncserver security update

Package : libvncserver
Version : 0.9.9+dfsg2-6.1+deb8u8
CVE ID : CVE-2019-20839 CVE-2020-14397 CVE-2020-14399 CVE-2020-14400
CVE-2020-14401 CVE-2020-14402 CVE-2020-14403 CVE-2020-14404
CVE-2020-14405
Debian Bug :

Several vulnerabilities have been discovered in libVNC (libvncserver Debian package), an
implemenantation of the VNC server and client protocol.

CVE-2019-20839

libvncclient/sockets.c in LibVNCServer had a buffer overflow via a
long socket filename.

CVE-2020-14397

libvncserver/rfbregion.c had a NULL pointer dereference.

CVE-2020-14399

Byte-aligned data was accessed through uint32_t pointers in
libvncclient/rfbproto.c.

CVE-2020-14400

Byte-aligned data was accessed through uint16_t pointers in
libvncserver/translate.c.

CVE-2020-14401

libvncserver/scale.c had a pixel_value integer overflow.

CVE-2020-14402

libvncserver/corre.c allowed out-of-bounds access via encodings.

CVE-2020-14403

libvncserver/hextile.c allowed out-of-bounds access via encodings.

CVE-2020-14404

libvncserver/rre.c allowed out-of-bounds access via encodings.

CVE-2020-14405

libvncclient/rfbproto.c does not limit TextChat size.

For Debian 8 "Jessie", these problems have been fixed in version
0.9.9+dfsg2-6.1+deb8u8.

We recommend that you upgrade your libvncserver packages.

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