EulerOS Virtualization 3.0.2.6 : libX11 (EulerOS-SA-2021-2905)

critical Nessus Plugin ID 156528

Synopsis

The remote EulerOS Virtualization host is missing a security update.

Description

According to the versions of the libX11 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

- 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 Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected libX11 packages.

See Also

http://www.nessus.org/u?158e3f94

Plugin Details

Severity: Critical

ID: 156528

File Name: EulerOS_SA-2021-2905.nasl

Version: 1.3

Type: local

Published: 1/6/2022

Updated: 1/20/2022

Risk Information

CVSS Score Source: CVE-2021-31535

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

Temporal Vector: E:POC/RL:OF/RC:C

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: E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:libX11, p-cpe:/a:huawei:euleros:libX11-common, cpe:/o:huawei:euleros:uvp:3.0.2.6

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 12/30/2021

Vulnerability Publication Date: 5/27/2021

Reference Information

CVE: CVE-2021-31535