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CVE-2023-3494

8.8 · HIGH

The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports.

Published Aug 1, 2023CWE-120EPSS 0.23%

Overview

CVE-2023-3494 is a high-severity vulnerability. It was published on August 1, 2023 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refsecurity.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.ascRefsecurity.netapp.com/advisory/ntap-20230831-0006/Refsecurity.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.ascRefsecurity.netapp.com/advisory/ntap-20230831-0006/

How CyberStrike helps

Frequently asked questions

What is CVE-2023-3494?

CVE-2023-3494 is a high-severity vulnerability. It was published on August 1, 2023 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2023-3494?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-3494?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-3494?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-3494 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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