Detections
Analytics

Xenstore: Guests can create orphaned Xenstore nodes (XSA-415)

medium Nessus Plugin ID 168022

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

By creating multiple nodes inside a transaction resulting in an error, a malicious guest can create orphaned nodes in the Xenstore data base, as the cleanup after the error will not remove all nodes already created. When the transaction is committed after this situation, nodes without a valid parent can be made permanent in the data base. A malicious guest can cause inconsistencies in the xenstored data base, resulting in unusual error responses or memory leaks in xenstored. This can finally cause Denial of Service situations or long running error recoveries of xenstored.

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-415.txt

Plugin Details

Severity: Medium

ID: 168022

File Name: xen_server_XSA-415.nasl

Version: 1.3

Type: local

Family: Misc.

Published: 11/21/2022

Updated: 9/8/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

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-2022-42310

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: Settings/ParanoidReport, installed_sw/Xen Hypervisor

Exploit Ease: No known exploits are available

Patch Publication Date: 11/1/2022

Vulnerability Publication Date: 11/1/2022

Reference Information

CVE: CVE-2022-42310

IAVB: 2022-B-0048-S