FreeBSD Security Advisory FreeBSD-SA-22:07.wifi_meshid

============================================================================= FreeBSD-SA-22:07.wifi_meshid Security Advisory The FreeBSD Project
Topic: 802.11 heap buffer overflow
Category: core Module: net80211 Announced: 2022-04-06 Credits: m00nbsd working with Trend Micro Zero Day Initiative Affects: All supported versions of FreeBSD. Corrected: 2022-04-05 22:59:53 UTC (stable/13, 13.1-STABLE) 2022-04-06 01:56:58 UTC (releng/13.1, 13.1-RC1-p1) 2022-04-06 03:04:17 UTC (releng/13.0, 13.0-RELEASE-p11) 2022-04-05 23:03:40 UTC (stable/12, 12.3-STABLE) 2022-04-06 03:06:33 UTC (releng/12.3, 12.3-RELEASE-p5) CVE Name: CVE-2022-23088
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I. Background
FreeBSD’s net80211 kernel subsystem provides infrastructure and drivers for IEEE 802.11 wireless (Wi-Fi) communications.
II. Problem Description
The 802.11 beacon handling routine failed to validate the length of an IEEE 802.11s Mesh ID before copying it to a heap-allocated buffer.
III. Impact
While a FreeBSD Wi-Fi client is in scanning mode (i.e., not associated with a SSID) a malicious beacon frame may overwrite kernel memory, leading to remote code execution.
IV. Workaround
No workaround is available. Systems not using Wi-Fi 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 # fetch # gpg –verify wifi_meshid.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/ 72617f9246e3 stable/13-n250273 releng/13.1/ 00cc1ce78da3 releng/13.1-n250079 releng/13.0/ b2b23824272d releng/13.0-n244797 stable/12/ r371868 releng/12.3/ r371873 – ————————————————————————-
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://
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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