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============================================================================= FreeBSD-SA-22:02.wifi Security Advisory The FreeBSD Project
Topic: Multiple WiFi issues
Category: core Module: net80211 Announced: 2022-03-15 Affects: FreeBSD 12.x and FreeBSD 13.0 Corrected: 2021-11-19 00:01:25 UTC (stable/13, 13.0-STABLE) 2022-03-15 17:45:36 UTC (releng/13.0, 13.0-RELEASE-p8) 2022-02-15 16:05:49 UTC (stable/12, 12.3-STABLE) 2022-03-15 18:18:08 UTC (releng/12.3, 12.3-RELEASE-p3) 2022-03-15 18:17:30 UTC (releng/12.2, 12.2-RELEASE-p14) CVE Name: CVE-2020-26147, CVE-2020-24588, CVE-2020-26144
Note: This issue is already fixed in FreeBSD 13.1-BETA1.
For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit
FreeBSD’s net80211 kernel subsystem provides infrastructure and drivers for IEEE 802.11 wireless (Wi-Fi) communications.
II. Problem Description
The paper “Fragment and Forge: Breaking Wi-Fi Through Frame Aggregation and Fragmentation” reported a number of security vulnerabilities in 802.11 specificaiton related to frame aggregation and fragmentation.
Additionally, FreeBSD 12.x missed length validation of SSIDs and Information Elements (IEs).
As reported on the FragAttacks website, the “design flaws are hard to abuse because doing so requires user interaction or is only possible when using uncommon network settings.” Under suitable conditions an attacker may be able to extract sensitive data or inject data.
No workaround is available, but the ability to extract or inject data is mitigated by the use of application (e.g. HTTPS) or transport (e.g. TLS, IPSEC) layer encryption.
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.
[FreeBSD 13.0] # fetch security.FreeBSD.org/patches/SA-22:02/wifi.13.patch # fetch security.FreeBSD.org/patches/SA-22:02/wifi.13.patch.asc # gpg –verify wifi.13.patch.asc
[FreeBSD 12.x] # fetch security.FreeBSD.org/patches/SA-22:02/wifi.12.patch # fetch security.FreeBSD.org/patches/SA-22:02/wifi.12.patch.asc # gpg –verify wifi.12.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
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/ 6acb9d5f955b stable/13-n248098 releng/13.0/ 0d1db5c3257e releng/13.0-n244782 stable/12/ r371640 releng/12.3/ r371748 releng/12.2/ r371740 – ————————————————————————-
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:
The latest revision of this advisory is available at
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