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AlmaLinux 8 : libvncserver (ALSA-2020:3385)

critical Nessus Plugin ID 157571

Synopsis

The remote AlmaLinux host is missing a security update.

Description

The remote AlmaLinux 8 host has a package installed that is affected by a vulnerability as referenced in the ALSA-2020:3385 advisory.

 - It was discovered that websockets.c in LibVNCServer prior to 0.9.12 did not properly decode certain WebSocket frames. A malicious attacker could exploit this by sending specially crafted WebSocket frames to a server, causing a heap-based buffer overflow. (CVE-2017-18922)

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-devel package.

See Also

https://errata.almalinux.org/8/ALSA-2020-3385.html

Plugin Details

Severity: Critical

ID: 157571

File Name: alma_linux_ALSA-2020-3385.nasl

Version: 1.3

Type: local

Published: 2/9/2022

Updated: 2/14/2022

Supported Sensors: Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2017-18922

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: p-cpe:/a:alma:linux:libvncserver-devel, cpe:/o:alma:linux:8

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/10/2020

Vulnerability Publication Date: 6/30/2020

Reference Information

CVE: CVE-2017-18922