Xen Hypervisor xenstored Write Saturation DoS (XSA-206)

low Nessus Plugin ID 99398

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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 in xenstored during processing of transactions. An attacker on the guest can exploit this vulnerability by issuing repeated writes to xenstore that conflict with transactions either of the toolstack or backends, such as the driver domain, causing the transactions made by these entities to fail indefinitely.

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: Low

ID: 99398

File Name: xen_server_XSA-206.nasl

Version: 1.4

Type: local

Family: Misc.

Published: 4/14/2017

Updated: 8/8/2018

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: Low

Base Score: 1.9

Temporal Score: 1.4

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

CVSS v3

Risk Factor: Low

Base Score: 2.5

Temporal Score: 2.2

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

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

Patch Publication Date: 3/28/2017

Vulnerability Publication Date: 3/28/2017

Reference Information

BID: 97250

Detections

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