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Xen Denial of Service Vulnerability (XSA-304)

high Nessus Plugin ID 134170

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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 a denial of service vulnerability due to an incorrect fix for CVE-2017-15595 which incorrectly drops some linear_pt_entry counts. A local, attacker could exploit this issue, by making loops or other arbitrary chains of linear pagetables, as described in XSA-240. A malicious or buggy PV guest may cause the hypervisor to crash, resulting in denial of service affecting the entire host. Privilege escalation and information leaks cannot be excluded.

Solution

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

See Also

http://www.nessus.org/u?bda0f738

Plugin Details

Severity: High

ID: 134170

File Name: xen_server_XSA-309.nasl

Version: 1.2

Type: local

Family: Misc.

Published: 3/2/2020

Updated: 3/3/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

CVSS Score Source: CVE-2019-19578

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/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: 12/11/2019

Vulnerability Publication Date: 12/11/2019

Reference Information

CVE: CVE-2019-19578