Xen VMentry Failure Denial Of Service vulnerability (XSA-308)

high Nessus Plugin ID 132339

Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

According to its self-reported version number, the Xen hypervisor installed on the remote host is affected by an denial of service vulnerability due to a mishandling of a certain case by VMX VMEntry. An unauthenticated remote attacker can exploit this issue, to cause a denial of service (DOS).

Note that Nessus has checked the changeset versions based on the xen.git change log. Nessus did not check guest hardware configurations or if patches were applied manually to the source code before a recompile and reinstall.

Solution

Apply the appropiate patch according to the vendor advisory.

See Also

http://www.nessus.org/u?3498c20c

http://www.nessus.org/u?5e75f4bb

Plugin Details

Severity: High

ID: 132339

File Name: xen_server_XSA-308.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 12/20/2019

Updated: 7/10/2020

Configuration: Enable paranoid mode

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

CVSS Score Source: CVE-2019-19583

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

Temporal Vector: 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: 12/11/2019

Vulnerability Publication Date: 12/11/2019

Reference Information

CVE: CVE-2019-19583

IAVB: 2019-B-0091-S