Debian DSA-4920-1 : libx11 - security update

critical Nessus Plugin ID 149897

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Synopsis

The remote Debian host is missing a security-related update.

Description

Roman Fiedler reported that missing length validation in various functions provided by libx11, the X11 client-side library, allow to inject X11 protocol commands on X clients, leading to authentication bypass, denial of service or potentially the execution of arbitrary code.

Solution

Upgrade the libx11 packages.

For the stable distribution (buster), this problem has been fixed in version 2:1.6.7-1+deb10u2.

Plugin Details

Severity: Critical

ID: 149897

File Name: debian_DSA-4920.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 5/25/2021

Updated: 6/14/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2021-31535

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:libx11

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/24/2021

Vulnerability Publication Date: 5/27/2021

Reference Information

CVE: CVE-2021-31535

DSA: 4920

Detections

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