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Posted on 29 October 2024
FreeBSD security notificat=============================================================================FreeBSD-SA-24:17.bhyve Security Advisory
The FreeBSD Project
Topic: Multiple issues in the bhyve hypervisor
Category: core
Module: bhyve
Announced: 2024-10-29
Credits: Synacktiv
Sponsored by: The FreeBSD Foundation, The Alpha-Omega Project
Affects: All supported versions of FreeBSD.
Corrected: 2024-10-19 15:42:15 UTC (stable/14, 14.1-STABLE)
2024-10-29 18:45:36 UTC (releng/14.1, 14.1-RELEASE-p6)
2024-10-19 15:43:46 UTC (stable/13, 13.4-STABLE)
2024-10-29 18:49:55 UTC (releng/13.4, 13.4-RELEASE-p2)
2024-10-29 18:53:41 UTC (releng/13.3, 13.3-RELEASE-p8)
CVE Name: CVE-2024-51562, CVE-2024-51563, CVE-2024-51564,
CVE-2024-51565, CVE-2024-51565
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
I. Background
bhyve(8) is a hypervisor that runs guest operating systems inside a virtual
machine.
II. Problem Description
Several vulnerabilities were found in the bhyve hypervisor's device models.
The NVMe driver function nvme_opc_get_log_page is vulnerable to a buffer over-
read from a guest-controlled value. (CVE-2024-51562)
The virtio_vq_recordon function is subject to a time-of-check to time-of-use
(TOCTOU) race condition. (CVE-2024-51563)
A guest can trigger an infinite loop in the hda audio driver.
(CVE-2024-51564)
The hda driver is vulnerable to a buffer over-read from a guest-controlled
value. (CVE-2024-51565)
The NVMe driver queue processing is vulernable to guest-induced infinite
loops. (CVE-2024-51565)
III. Impact
Malicious guest virtual machines may be able to perform a denial of service
(DoS) of the bhyve host, and may read memory within the bhyve process that
they should not be able to access.
IV. Workaround
No workaround is available. Virtual machines that provide none of the NVMe,
virtio, and hda devices to the guest are not vulnerable.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.
Restart bhyve processes, or reboot the system.
Perform one of the following:
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the amd64 or arm64 platforms,
or the i386 platform on FreeBSD 13, can be updated via the freebsd-update(8)
utility:
# freebsd-update fetch
# freebsd-update install
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch https://security.FreeBSD.org/patches/SA-24:17/bhyve.patch
# fetch https://security.FreeBSD.org/patches/SA-24:17/bhyve.patch.asc
# gpg --verify bhyve.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
Restart the applicable bhyve processes, or reboot the system.
VI. Correction details
This issue is corrected as of the corresponding Git commit hash in the
following stable and release branches:
Branch/path Hash Revision
- -------------------------------------------------------------------------
stable/14/ 86ba5941b132 stable/14-n269162
releng/14.1/ fcd9a2d8a5bd releng/14.1-n267723
stable/13/ df1a36fdfae6 stable/13-n258536
releng/13.4/ 5d07a7e902fa releng/13.4-n258265
releng/13.3/ adb7b541aea1 releng/13.3-n257475
- -------------------------------------------------------------------------
Run the following command to see which files were modified by a
particular commit:
# git show --stat <commit hash>
Or visit the following URL, replacing NNNNNN with the hash:
<URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>
To determine the commit count in a working tree (for comparison against
nNNNNNN in the table above), run:
# git rev-list --count --first-parent HEAD
VII. References
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-51562>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-51563>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-51564>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-51565>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-51565>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-24:17.bhyve.asc>
