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CVE-2023-26484— On a compromised KubeVirt node, the virt-handler service account can be used to modify all node specs

Quick assessment

Affected
kubevirt kubevirt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubevirt是一款虚拟机管理器。 KubeVirt 0.59.0 及之存在安全漏洞，该漏洞源于如果恶意用户接管了运行 virt-handler的 Kubernetes 节点，则可以使用 virt-handler 服务帐户修改所有节点规范。

CVSS 8.2 · High EPSS 0.61% · P47
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I. Basic Information for CVE-2023-26484

Vulnerability Information
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Vulnerability Title
On a compromised KubeVirt node, the virt-handler service account can be used to modify all node specs
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
KubeVirt 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubevirt是一款虚拟机管理器。 KubeVirt 0.59.0 及之存在安全漏洞，该漏洞源于如果恶意用户接管了运行 virt-handler的 Kubernetes 节点，则可以使用 virt-handler 服务帐户修改所有节点规范。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kubevirt kubevirt <= 0.59.0 -

II. Public POCs for CVE-2023-26484

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III. Intelligence Information for CVE-2023-26484

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Vendor Advisories for CVE-2023-26484 (1)

Other References for CVE-2023-26484 (1)

IV. Related Vulnerabilities

Same product: kubevirt
Same vendor: kubevirt
Same weakness: CWE-863

V. Comments for CVE-2023-26484

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