Xen Project Dynamic Height Handling Elevation of Privilege Vulnerability (XSA-311)

high Nessus Plugin ID 132391

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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 or possibly an elevation of privilege vulnerability by triggering data-structure access during pagetable-height updates. An unauthenticated, local attacker can exploit this issue, by causing Xen to access data structures while they are being modified, causing Xen to crash which cause a devial of service. Privilege escalation is thought to be very difficult but cannot be ruled out.

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 appropriate patch according to the vendor advisory.

Plugin Details

Severity: High

ID: 132391

File Name: xen_server_XSA-311.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 12/23/2019

Updated: 7/10/2020

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

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-2019-19577

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: CVSS:3.0/AV:P/AC:L/PR:H/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: 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-2019-19577

IAVB: 2019-B-0091-S

Detections

Analytics