KubeVirt is a virtual machine management add-on for Kubernetes. In versions before 1.5.3 and 1.6.1, the virt-handler does not verify whether the launcher-sock is a symlink or a regular file. This oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID 107 (the same user used by virt-launcher) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host. To successfully exploit this vulnerability, an attacker should be in control of the file system of the virt-launcher pod. This vulnerability is fixed in 1.5.3 and 1.6.1.

Affected: Go: kubevirt.io/kubevirt

### Summary _Short summary of the problem. Make the impact and severity as clear as possible.

It is possible to trick the `virt-handler` component into changing the ownership of arbitrary files on the host node to the unprivileged user with UID `107` due to mishandling of symlinks when determining the root mount of a `virt-launcher` pod.

### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._

In the current implementation, the `virt-handler` does not verify whether the `launcher-sock` is a symlink or a regular file. This oversight can be exploited, for example, to change the ownership of arbitrary files on the host node to the unprivileged user with UID `107` (the same user used by `virt-launcher`) thus, compromising the CIA (Confidentiality, Integrity and Availability) of data on the host. To successfully exploit this vulnerability, an attacker should be in control of the file system of the `virt-launcher` pod.

### PoC _Complete instructions, including specific configuration details, to reproduce the vulnerability._

In this demonstration, two additional vulnerabilities are combined with the primary issue to arbitrarily change the ownership of a file located on the host node:

1. A symbolic link (`launcher-sock`) is used to manipulate the interpretation of the root mount within the affected container, effectively bypassing expected isolation boundaries. 2. Another symbolic link (`disk.img`) is…

kubevirt-container-disk-1.6.3-1.1 on GA media

Security update for kubevirt

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