FreeBSD Security Advisory FreeBSD-SA-22:06.ioctl


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============================================================================= FreeBSD-SA-22:06.ioctl Security Advisory The FreeBSD Project
Topic: mpr/mps/mpt driver ioctl heap out-of-bounds write
Category: core Module: mpr, mps, mpt Announced: 2022-04-06 Credits: Lucas Leong (@_wmliang_), Trend Micro Zero Day Initiative Affects: All supported versions of FreeBSD. Corrected: 2022-04-04 00:46:25 UTC (stable/13, 13.1-STABLE) 2022-04-04 16:24:36 UTC (releng/13.1, 13.1-RC1-p1) 2022-04-06 03:04:16 UTC (releng/13.0, 13.0-RELEASE-p11) 2022-04-04 00:47:44 UTC (stable/12, 12.3-STABLE) 2022-04-06 03:06:31 UTC (releng/12.3, 12.3-RELEASE-p5) CVE Name: CVE-2022-23086
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I. Background
mpr(4), mps(4), and mpt(4) are disk controller drivers. They export an ioctl(2) interface used by command-line utilities to query or set properties on the device.
II. Problem Description
Handlers for *_CFG_PAGE read / write ioctls in the mpr, mps, and mpt drivers allocated a buffer of a caller-specified size, but copied to it a fixed size header. Other heap content would be overwritten if the specified size was too small.
III. Impact
Users with access to the mpr, mps or mpt device node may overwrite heap data, potentially resulting in privilege escalation. Note that the device node is only accessible to root and members of the operator group.
IV. Workaround
No workaround is available. Systems that do not use mpr(4), mps(4) or mpt(4) are not affected.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot.
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, i386, or (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility:
# freebsd-update fetch # freebsd-update install # shutdown -r +10min “Rebooting for a security update”
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 security.FreeBSD.org/patches/SA-22:06/ioctl.patch # fetch security.FreeBSD.org/patches/SA-22:06/ioctl.patch.asc # gpg –verify ioctl.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in and reboot the system.
VI. Correction details
This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches:
Branch/path Hash Revision – ————————————————————————- stable/13/ 0b29e1b9f9df stable/13-n250225 releng/13.1/ aef190f298af releng/13.1-n250066 releng/13.0/ e724f3ce7970 releng/13.0-n244796 stable/12/ r371855 releng/12.3/ r371872 – ————————————————————————-
For FreeBSD 13 and later:
Run the following command to see which files were modified by a particular commit:
# git show –stat
Or visit the following URL, replacing NNNNNN with the hash:

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
For FreeBSD 12 and earlier:
Run the following command to see which files were modified by a particular revision, replacing NNNNNN with the revision number:
# svn diff -cNNNNNN –summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:

VII. References


The latest revision of this advisory is available at —–BEGIN PGP SIGNATURE—–
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