CVE-2021-3631 Privilege escalation in libvirt

Medium 6.3 Published 2 Mar 2022 Updated 19 Nov 2024

A flaw in libvirt allows a compromised guest VM to access files of another guest, breaking sVirt confinement and compromising confidentiality and integrity.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-3631?

CVE-2021-3631 is a medium-severity vulnerability in Netapp Ontap Select Deploy Administration Utility, published on 2 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-732

Which versions are affected by CVE-2021-3631?

It affects 4 products.

Linux distribution packages (4)

`libvirt` SUSE:Linux Enterprise Micro 5.0	All versions	`6.0.0-13.16.2`
`libvirt` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`6.0.0-13.16.2`
`libvirt` SUSE:Linux Enterprise Module for Server Applications 15 SP2	All versions	`6.0.0-13.16.2`
`libvirt` openSUSE:Leap 15.2	All versions	`6.0.0-lp152.9.12.1`

Products include Netapp Ontap Select Deploy Administration Utility, Redhat Enterprise Linux, Redhat Libvirt, Redhat Openshift Container Platform.

How do I fix CVE-2021-3631?

Apply the vendor's patch.

Is CVE-2021-3631 being exploited?

There is no known exploitation of CVE-2021-3631 in the wild and no public exploit code.

All Netapp Ontap Select Deploy Administration Utility vulnerabilities

Sources

Also known as DEBIAN-CVE-2021-3631, GHSA-4225-xq9f-4ww3, MGASA-2021-0399, SUSE-SU-2021:2471-1, UBUNTU-CVE-2021-3631, openSUSE-SU-2021:1119-1.