Main Vulnerability Database SB2021082515

SB2021082515 - Remote code execution in FreeBSD bhyve device models

Published: August 25, 2021

Security Bulletin ID SB2021082515

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Remote access

Highest impact Code execution

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Buffer overflow (CVE-ID: CVE-2021-29631)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: 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]

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.

Remediation

Install update from vendor's website.

References

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