Detections
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Xen mishandling of the event channel validity constraint DoS (XSA-338))

medium Nessus Plugin ID 144975

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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 due to a mishandling of the constraint that once-valid event channels may not turn invalid. An unprivileged guest may be able to crash Xen, leading to a denial of service for the entire system.

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

https://xenbits.xen.org/xsa/advisory-338.html

Plugin Details

Severity: Medium

ID: 144975

File Name: xen_server_XSA-338.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 1/14/2021

Updated: 6/3/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2020-25597

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: cpe:/o:xen:xen

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/22/2020

Vulnerability Publication Date: 9/22/2020

Reference Information

CVE: CVE-2020-25597

CWE: 119

IAVB: 2020-B-0056-S