Detections
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Xenstore: Cooperating guests can create arbitrary numbers of nodes (XSA-419)

medium Nessus Plugin ID 168053

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

Xenstore: Two malicious guests working together can create an arbitrary number of Xenstore nodes and drive xenstored into an out of memory situation. This is possible by domain A letting domain B write into domain A local Xenstore tree. Domain B can then create many nodes and reboot. The nodes created by domain B will now be owned by Dom0. By repeating this process over and over again an arbitrary number of nodes can be created, as Dom0 number of nodes isn't limited by Xenstore quota.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the appropriate patch according to the vendor advisory.

See Also

https://xenbits.xenproject.org/xsa/advisory-417.txt

Plugin Details

Severity: Medium

ID: 168053

File Name: xen_server_XSA-419.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 11/22/2022

Updated: 10/25/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2022-42323

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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: 11/1/2022

Vulnerability Publication Date: 11/1/2022

Reference Information

CVE: CVE-2022-42322, CVE-2022-42323