CVE-2021-3631

libvirt: Insecure sVirt label generation

Severity Score

6.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A flaw was found in libvirt while it generates SELinux MCS category pairs for VMs' dynamic labels. This flaw allows one exploited guest to access files labeled for another guest, resulting in the breaking out of sVirt confinement. The highest threat from this vulnerability is to confidentiality and integrity.

Se ha encontrado un fallo en libvirt mientras genera pares de categorías MCS de SELinux para las etiquetas dinámicas de las máquinas virtuales. Este defecto permite que un huésped explotado acceda a archivos etiquetados para otro huésped, resultando en una ruptura del confinamiento de sVirt. La mayor amenaza de esta vulnerabilidad es para la confidencialidad y la integridad

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-06-30 CVE Reserved
2021-10-01 CVE Published
2024-05-24 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-732: Incorrect Permission Assignment for Critical Resource

CAPEC

References (8)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2024/04/msg00000.html	Mailing List
https://security.netapp.com/advisory/ntap-20220331-0010	Third Party Advisory

URL	Date	SRC
https://gitlab.com/libvirt/libvirt/-/issues/153	2024-08-03

URL	Date	SRC
https://gitlab.com/libvirt/libvirt/-/commit/15073504dbb624d3f6c911e85557019d3620fdb2	2024-04-01

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2021:3631	2024-04-01
https://bugzilla.redhat.com/show_bug.cgi?id=1977726	2021-11-09
https://security.gentoo.org/glsa/202210-06	2024-04-01
https://access.redhat.com/security/cve/CVE-2021-3631	2021-11-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Redhat Search vendor "Redhat"		Libvirt Search vendor "Redhat" for product "Libvirt"				< 7.5.0 Search vendor "Redhat" for product "Libvirt" and version " < 7.5.0"		-		Affected
Redhat Search vendor "Redhat"		Openshift Container Platform Search vendor "Redhat" for product "Openshift Container Platform"				4.8 Search vendor "Redhat" for product "Openshift Container Platform" and version "4.8"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		advanced_virtualization		Affected
Netapp Search vendor "Netapp"		Ontap Select Deploy Administration Utility Search vendor "Netapp" for product "Ontap Select Deploy Administration Utility"				-		-		Affected