CVE-2021-3308

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in Xen 4.12.3 through 4.12.4 and 4.13.1 through 4.14.x. An x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector exhaustion on the system, not allowing further PCI pass through devices to work properly. HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case, this would affect the entire host.

Se detectó un problema en Xen versiones 4.12.3 hasta 4.12.4 y versiones 4.13.1 hasta 4.14.x. Un invitado HVM x86 con PCI pasando a través de los dispositivos puede forzar la asignación de todos los vectores IDT en el sistema al reiniciarse con las capacidades MSI o MSI-X habilitadas y la configuración de entradas. Dichos reinicios filtrarán todos los vectores usados por las entradas MSI(-X) que el invitado podría haber habilitado y, por lo tanto, conllevarán al agotamiento del vector en el sistema, lo que no permitirá que otros dispositivos PCI pasen a funcionar correctamente. Los invitados HVM con PCI pasando a través de los dispositivos pueden montar un ataque de denegación de servicio (DoS) que afecta el paso de dispositivos PCI para otros invitados o al dominio del hardware. En el último caso, esto afectaría a todo el host

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-26 CVE Reserved
2021-01-26 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2021/01/26/4	2023-11-07
http://xenbits.xen.org/xsa/advisory-360.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S5C42TMQYB6SDVT2MPFEWY65A6RSUVBN	2023-11-07
https://security.gentoo.org/glsa/202107-30	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				>= 4.13.1 <= 4.14.1 Search vendor "Xen" for product "Xen" and version " >= 4.13.1 <= 4.14.1"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.12.3 Search vendor "Xen" for product "Xen" and version "4.12.3"		-		Affected
Xen Search vendor "Xen"		Xen Search vendor "Xen" for product "Xen"				4.12.4 Search vendor "Xen" for product "Xen" and version "4.12.4"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected