Xen Hypervisor Page Type Reference Handling Memory Exhaustion Guest-to-Host DoS (XSA-242)

high Nessus Plugin ID 103977

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VPR Score: 7.3

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 unspecified flaw in arch/x86/mm.c that is triggered as page type references are not properly handled when performing certain cleanup operations. This allows an attacker on the guest to consume excessive memory, resulting in a denial of service for the host.

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.

See Also

http://xenbits.xen.org/xsa/advisory-242.html

https://xenbits.xen.org/gitweb/?p=xen.git;a=summary

Plugin Details

Severity: High

ID: 103977

File Name: xen_server_XSA-242.nasl

Version: 1.6

Type: local

Family: Misc.

Published: 10/19/2017

Updated: 11/12/2019

Dependencies: xen_server_detect.nbin

Configuration: Enable paranoid mode

Risk Information

Risk Factor: High

VPR Score: 7.3

CVSS Score Source: CVE-2017-15595

CVSS v2.0

Base Score: 7.2

Temporal Score: 5.6

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

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

CVSS v3.0

Base Score: 8.8

Temporal Score: 7.9

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

Temporal Vector: E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:xen:xen

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/12/2017

Vulnerability Publication Date: 10/12/2017

Reference Information

CVE: CVE-2017-15588, CVE-2017-15589, CVE-2017-15590, CVE-2017-15591, CVE-2017-15592, CVE-2017-15593, CVE-2017-15594, CVE-2017-15595, CVE-2017-15596

BID: 101490, 101496, 101500

IAVB: 2017-B-0142