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Xen PCI Pass-Through Elevation of Privilege vulnerability (XSA-302)

medium Nessus Plugin ID 131019

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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 an elevation of privilege vulnerability due to a memory corruption that may occur after a passed through PCI device is deassigned from an untrusted domain. An unauthenticated attacker with physical access to the device can exploit this issue, by programming the device to DMA to an arbitrary address to gain elevated privileges.

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?a983e394

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

Plugin Details

Severity: Medium

ID: 131019

File Name: xen_server_XSA-302.nasl

Version: 1.4

Type: local

Family: Misc.

Published: 11/14/2019

Updated: 7/10/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.9

Temporal Score: 5.1

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

CVSS Score Source: CVE-2019-18424

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:P/AC:L/PR:N/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: 10/31/2019

Vulnerability Publication Date: 10/31/2019

Reference Information

CVE: CVE-2019-18424

IAVB: 2019-B-0084-S