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Improper Link Resolution Before File Access ('Link Following')

CVE-2025-64437

Medium
5/10

Summary

KubeVirt is a virtual machine management add-on for Kubernetes. In versions prior to 1.5.3 and 1.6.x prior to 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.

  • HIGH
  • LOCAL
  • LOW
  • CHANGED
  • NONE
  • HIGH
  • LOW
  • LOW

CWE-59 - Improper Link Resolution Before File Access

'Improper link resolution before file access' occurs when software accesses a file resource but fails to verify that the file isn't a link or shortcut to another file. An attacker can potentially gain access to arbitrary files and from there the impact can vary, depending on the application, from sensitive data exposure to remote code execution.

References

Advisory Timeline

  • Published