Date: Wed, 6 Apr 2022 04:08:18 +0000 (UTC) From: FreeBSD Security Advisories <security-advisories@freebsd.org> To: FreeBSD Security Advisories <security-advisories@freebsd.org> Subject: FreeBSD Security Advisory FreeBSD-SA-22:07.wifi_meshid Message-ID: <20220406040818.AA6503814@freefall.freebsd.org>
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=============================================================================
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
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
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 https://security.FreeBSD.org/patches/SA-22:07/wifi_meshid.patch
# fetch https://security.FreeBSD.org/patches/SA-22:07/wifi_meshid.patch.asc
# 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
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html>; 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 <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
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:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>;
VII. References
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-23088>;
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-22:07.wifi_meshid.asc>;
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