KubeVirt up to 0.59.0 on Kubernetes authorization

Summaryinfo

A vulnerability classified as critical was found in KubeVirt up to 0.59.0 on Kubernetes. This vulnerability affects unknown code. Such manipulation leads to authorization. This vulnerability is referenced as CVE-2023-26484. It is possible to launch the attack remotely. No exploit is available. Applying the suggested workaround is recommended.

Detailsinfo

A vulnerability was found in KubeVirt up to 0.59.0 on Kubernetes and classified as critical. Affected by this issue is an unknown function. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, and integrity. CVE summarizes:

KubeVirt is a virtual machine management add-on for Kubernetes. In versions 0.59.0 and prior, if a malicious user has taken over a Kubernetes node where virt-handler (the KubeVirt node-daemon) is running, the virt-handler service account can be used to modify all node specs. This can be misused to lure-in system-level-privileged components which can, for instance, read all secrets on the cluster, or can exec into pods on other nodes. This way, a compromised node can be used to elevate privileges beyond the node until potentially having full privileged access to the whole cluster. The simplest way to exploit this, once a user could compromise a specific node, is to set with the virt-handler service account all other nodes to unschedulable and simply wait until system-critical components with high privileges appear on its node. No patches are available as of time of publication. As a workaround, gatekeeper users can add a webhook which will block the `virt-handler` service account to modify the spec of a node.

The weakness was published 03/16/2023 as 9109. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2023-26484 since 02/23/2023. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 215344 (Azure Linux 3.0 Security Update: kubevirt (CVE-2023-26484)), which helps to determine the existence of the flaw in a target environment.

The best possible mitigation is suggested to be Workaround.

The vulnerability is also documented in the vulnerability database at Tenable (215344). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• KubeVirt

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.38
• 0.39
• 0.40
• 0.41
• 0.42
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47
• 0.48
• 0.49
• 0.50
• 0.51
• 0.52
• 0.53
• 0.54
• 0.55
• 0.56
• 0.57
• 0.58
• 0.59.0

Website

• Product: https://github.com/kubevirt/kubevirt/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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