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Xen: double unlock in x86 guest IRQ handling (XSA-458)

high Nessus Plugin ID 202621

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Synopsis

The remote Xen hypervisor installation is missing a security update.

Description

An optional feature of PCI MSI called 'Multiple Message' allows a device to use multiple consecutive interrupt vectors. Unlike for MSI-X, the setting up of these consecutive vectors needs to happen all in one go. In this handling an error path could be taken in different situations, with or without a particular lock held. This error path wrongly releases the lock even when it is not currently held.

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://seclists.org/oss-sec/2024/q3/73

Plugin Details

Severity: High

ID: 202621

File Name: xen_server_XSA-458.nasl

Version: 1.4

Type: local

Family: Misc.

Published: 7/18/2024

Updated: 8/22/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2024-31143

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/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: Settings/ParanoidReport, installed_sw/Xen Hypervisor

Exploit Ease: No known exploits are available

Patch Publication Date: 7/16/2024

Vulnerability Publication Date: 7/16/2024

Reference Information

CVE: CVE-2024-31143

IAVB: 2024-B-0095