bhyveload -h <host-path> may be used to grant loader access to the directory tree on the host. Affected versions of bhyveload(8) do not make any attempt to restrict loader's access to , allowing the loader to read any file the host user has access to. In the bhyveload(8) model, the host supplies a userboot.so to boot with, but the loader scripts generally come from the guest image. A maliciously crafted script could be used to exfiltrate sensitive data from the host accessible to the user running bhyhveload(8), which is often the system root.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-25940
• https://security.freebsd.org/advisories/FreeBSD-SA-24:01.bhyveload.asc
• https://security.netapp.com/advisory/ntap-20240419-0004