Debian DLA-2347-1 : libvncserver security update

medium Nessus Plugin ID 140046

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Synopsis

The remote Debian host is missing a security update.

Description

Several minor vulnerabilities have been discovered in libvncserver, a server and client implementation of the VNC protocol.

CVE-2019-20839

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

CVE-2020-14397

libvncserver/rfbregion.c has a NULL pointer dereference.

CVE-2020-14399

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

NOTE: This issue has been disputed by third parties; there is reportedly 'no trust boundary crossed'.

CVE-2020-14400

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

NOTE: This issue has been disputed by third parties. There is no known path of exploitation or cross of a trust boundary.

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 did not limit TextChat size.

For Debian 9 stretch, these problems have been fixed in version 0.9.11+dfsg-1.3~deb9u5.

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/libvncserver

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected packages.

Plugin Details

Severity: Medium

ID: 140046

File Name: debian_DLA-2347.nasl

Version: 1.2

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 8/31/2020

Updated: 9/2/2020

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P

CVSS Score Source: CVE-2020-14401

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:libvncclient1, p-cpe:/a:debian:debian_linux:libvncclient1-dbg, p-cpe:/a:debian:debian_linux:libvncserver-config, p-cpe:/a:debian:debian_linux:libvncserver-dev, p-cpe:/a:debian:debian_linux:libvncserver1, p-cpe:/a:debian:debian_linux:libvncserver1-dbg, cpe:/o:debian:debian_linux:9.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 8/28/2020

Vulnerability Publication Date: 6/17/2020

Reference Information

CVE: 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

Detections

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