Detections
Analytics

Xen Missing memory barriers DoS (XSA-340)

high Nessus Plugin ID 144856

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

A denial of service (DoS) vulnerability exists in Xen servers when accessing/allocating an event channel due to a missing memory barrier. An authenticated, local attacker may be able to cause a hypervisor crash resulting in a Denial of Service (DoS).

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the appropriate patch or workaround according to the vendor advisory.

See Also

http://www.nessus.org/u?3aa7d082

Plugin Details

Severity: High

ID: 144856

File Name: xen_server_XSA-340.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 1/12/2021

Updated: 6/3/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2020-25603

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/o:xen:xen

Required KB Items: Settings/ParanoidReport, installed_sw/Xen Hypervisor

Exploit Ease: No known exploits are available

Patch Publication Date: 9/22/2020

Vulnerability Publication Date: 9/22/2020

Reference Information

CVE: CVE-2020-25603

CWE: 401

IAVB: 2020-B-0056-S