CVE-2020-29481

Severity Score

8.8

*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 through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/<domid> are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.

Se detectó un problema en Xen versiones hasta 4.14.x. Los derechos de acceso de los nodos de Xenstore son per domid. Desafortunadamente, los derechos de acceso concedidos existentes no son eliminados cuando un dominio ha sido destruido. Esto significa que un nuevo dominio creado con el mismo domid heredará los derechos de acceso a los nodos de Xenstore de los dominios anteriores con el mismo domid. Debido a que todas las entradas de Xenstore de un invitado por debajo /local/domain/(domid) han sido eliminadas por las herramientas Xen, cuando un invitado es destruido; solo las entradas Xenstore de otros invitados que aún se estén ejecutando están afectadas. Por ejemplo, un dominio invitado recién creado puede ser capaz de leer información confidencial que perteneciera a un dominio invitado previamente existente. Ambas implementaciones de Xenstore (C y Ocaml) son vulnerables

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-03 CVE Reserved
2020-12-15 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-269: Improper Privilege Management

CAPEC

References (5)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2020/12/16/3	Mailing List

URL	Date	SRC

URL	Date	SRC
https://xenbits.xenproject.org/xsa/advisory-322.html	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI	2023-11-07
https://www.debian.org/security/2020/dsa-4812	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"				<= 4.14.0 Search vendor "Xen" for product "Xen" and version " <= 4.14.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected