Amazon Linux 2 : libvncserver (ALAS-2018-1012)

critical Nessus Plugin ID 109691
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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

Improper input sanitization in rfbProcessClientNormalMessage in rfbserver.c

An issue was discovered in LibVNCServer through 0.9.11.
rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.(CVE-2018-7225)

Solution

Run 'yum update libvncserver' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2018-1012.html

Plugin Details

Severity: Critical

ID: 109691

File Name: al2_ALAS-2018-1012.nasl

Version: 1.1

Type: local

Agent: unix

Published: 5/11/2018

Updated: 5/11/2018

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:libvncserver, p-cpe:/a:amazon:linux:libvncserver-debuginfo, p-cpe:/a:amazon:linux:libvncserver-devel, cpe:/o:amazon:linux:2

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

Patch Publication Date: 5/10/2018

Reference Information

CVE: CVE-2018-7225

ALAS: 2018-1012