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

    From FreeBSD Security Advisories@21:1/5 to All on Wed Apr 6 05:00:07 2022
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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> -----BEGIN PGP SIGNATURE-----

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