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.
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Mon, 21 Oct 2024 21:15:00 +0000
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MITRE
Status: PUBLISHED
Assigner: freebsd
Published: 2023-08-01T22:13:21.634Z
Updated: 2024-10-21T20:17:19.843Z
Reserved: 2023-06-30T22:57:48.603Z
Link: CVE-2023-3494
Vulnrichment
Updated: 2024-08-02T06:55:03.345Z
NVD
Status : Modified
Published: 2023-08-01T23:15:31.053
Modified: 2023-08-31T19:15:11.010
Link: CVE-2023-3494
Redhat
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