Detections
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CentOS 8 : libvncserver (CESA-2021:1811)

high Nessus Plugin ID 149728

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Synopsis

The remote CentOS host is missing one or more security updates.

Description

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2021:1811 advisory.

 - libvncserver: uninitialized memory contents are vulnerable to Information Leak (CVE-2018-21247)

 - libvncserver: buffer overflow in ConnectClientToUnixSock() (CVE-2019-20839)

 - libvncserver: libvncserver/rfbregion.c has a NULL pointer dereference (CVE-2020-14397)

 - libvncserver: libvncclient/rfbproto.c does not limit TextChat size (CVE-2020-14405)

 - libvncserver: libvncserver/rfbserver.c has a divide by zero which could result in DoS (CVE-2020-25708)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected libvncserver and / or libvncserver-devel packages.

See Also

https://access.redhat.com/errata/RHSA-2021:1811

Plugin Details

Severity: High

ID: 149728

File Name: centos8_RHSA-2021-1811.nasl

Version: 1.4

Type: local

Agent: unix

Published: 5/19/2021

Updated: 1/1/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2018-21247

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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

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

Vulnerability Information

CPE: cpe:/o:centos:centos:8-stream, p-cpe:/a:centos:centos:libvncserver, p-cpe:/a:centos:centos:libvncserver-devel

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/18/2021

Vulnerability Publication Date: 6/17/2020

Reference Information

CVE: CVE-2018-21247, CVE-2019-20839, CVE-2020-14397, CVE-2020-14405, CVE-2020-25708

RHSA: 2021:1811