#VU46742 Security restrictions bypass in FreeBSD - CVE-2020-24718

Vulnerability identifier: #VU46742

Vulnerability risk: Medium

CVSSv4.0: 6.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-24718

CWE-ID: CWE-264

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 escalate privileges on the system.

The vulnerability exists in bhyve(8) hypervisor due to application does not properly impose security restrictions. A remote root user on the host within jailed environment can run a specially crafted program to execute arbitrary code on systems that rely on bhyve(8) in jail for security domain separation.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.2

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External links
https://www.freebsd.org/security/advisories/FreeBSD-SA-20:28.bhyve_vmcs.asc

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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