Vulnerability identifier: #VU56091

Vulnerability risk: Medium

CVSSv3.1: 6.2 [CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29631

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeBSD
Operating systems & Components / Operating system

Vendor: FreeBSD Foundation

Description

The vulnerability allows a remote user to compromise the affected system.

The vulnerability exists due to improper error handling in bhyve(8) hypervisor when fetching I/O descriptors in certain VirtIO-based device models. A remote guest can run a specially crafted program to trigger memory corruption and execute arbitrary code in context of the bhyve process on the host OS.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 13.0

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External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-21:13.bhyve.asc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.