Rocky Linux 8 : libX11 (RLSA-2021:4326)

critical Nessus Plugin ID 185051

Synopsis

The remote Rocky Linux host is missing a security update.

Description

The remote Rocky Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2021:4326 advisory.

- LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code. The libX11 XLookupColor request (intended for server-side color lookup) contains a flaw allowing a client to send color-name requests with a name longer than the maximum size allowed by the protocol (and also longer than the maximum packet size for normal-sized packets). The user-controlled data exceeding the maximum size is then interpreted by the server as additional X protocol requests and executed, e.g., to disable X server authorization completely. For example, if the victim encounters malicious terminal control sequences for color codes, then the attacker may be able to take full control of the running graphical session. (CVE-2021-31535)

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 packages.

Plugin Details

Severity: Critical

ID: 185051

File Name: rocky_linux_RLSA-2021-4326.nasl

Version: 1.0

Type: local

Family: Rocky Linux Local Security Checks

Published: 11/7/2023

Updated: 11/7/2023

Supported Sensors: Continuous Assessment, 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: p-cpe:/a:rocky:linux:libx11-common, p-cpe:/a:rocky:linux:libx11-debuginfo, p-cpe:/a:rocky:linux:libx11-devel, p-cpe:/a:rocky:linux:libx11-xcb-debuginfo, p-cpe:/a:rocky:linux:libx11-xcb, p-cpe:/a:rocky:linux:libx11, cpe:/o:rocky:linux:8, p-cpe:/a:rocky:linux:libx11-debugsource

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/9/2021

Vulnerability Publication Date: 5/27/2021

Reference Information

CVE: CVE-2021-31535

Detections

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