CVE-2016-9941 — libvncserver - security update

Description

Heap-based buffer overflow in rfbproto.c in LibVNCClient in LibVNCServer before 0.9.11 allows remote servers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted FramebufferUpdate message containing a subrectangle outside of the client drawing area.

How to fix CVE-2016-9941

To remediate CVE-2016-9941, upgrade the affected package to a fixed version below.

—upgrade to 0.9.11-r0 or later
—upgrade to 0.9.11+dfsg-1 or later
—upgrade to 0.9.9+dfsg-1+deb7u2 or later
—upgrade to 0.9.9+dfsg2-6.1+deb8u2 or later
—upgrade to 4.1.4+repack1-1 or later

Is CVE-2016-9941 being exploited?

Low — EPSS is 1.7%, meaning exploitation activity has not been observed at scale.

Affected packages (5)

from 0, < 0.9.11-r0
from 0, < 0.9.11+dfsg-1
from 0, < 0.9.9+dfsg-1+deb7u2
from 0, < 0.9.9+dfsg2-6.1+deb8u2
from 0, < 4.1.4+repack1-1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	CRITICAL9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (2)

ADVISORYsecurity.alpinelinux.org/vuln/CVE-2016-9941
ADVISORYsecurity-tracker.debian.org/tracker/CVE-2016-9941