Vulnerability Description
The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports. The interface lets the guest copy a string into a buffer resident in the bhyve process' memory. A bug in the state machine implementation can result in a buffer overflowing when copying this string. Malicious, privileged software running in a guest VM can exploit the buffer overflow to achieve code execution on the host in the bhyve userspace process, which typically runs as root, mitigated by the capabilities assigned through the Capsicum sandbox available to the bhyve process.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Freebsd | Freebsd | 13.1 |
Related Weaknesses (CWE)
References
- https://security.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.ascVendor Advisory
- https://security.netapp.com/advisory/ntap-20230831-0006/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.ascVendor Advisory
- https://security.netapp.com/advisory/ntap-20230831-0006/
FAQ
What is CVE-2023-3494?
CVE-2023-3494 is a vulnerability with a CVSS score of 8.8 (HIGH). The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports. The interface lets the guest copy a string into a buffer resident in the bhyve process...
How severe is CVE-2023-3494?
CVE-2023-3494 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-3494?
Check the references section above for vendor advisories and patch information. Affected products include: Freebsd Freebsd.