Buffer overflow in FreeBSD - CVE-2021-29631

Vulnerability identifier: #VU56091

CSH Severity: Medium

CVSS v4: 7.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-29631

CWE-ID: CWE-119

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

FreeBSD

Install updates from vendor's website.

• https://www.freebsd.org/security/advisories/FreeBSD-SA-21:13.bhyve.asc

• Remote code execution in FreeBSD bhyve device models