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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-21:12.divert

    From FreeBSD Errata Notices@21:1/5 to All on Thu May 27 01:00:01 2021
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    ============================================================================= FreeBSD-EN-21:12.divert Errata Notice
    The FreeBSD Project

    Topic: Kernel double free when transmitting on a divert socket

    Category: core
    Module: divert(4)
    Announced: 2021-05-26
    Affects: FreeBSD 13.0
    Corrected: 2021-05-10 13:36:08 UTC (stable/13, 13.0-STABLE)
    2021-05-26 19:30:51 UTC (releng/13.0, 13.0-RELEASE-p1)

    For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security
    branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>.

    I. Background

    divert(4) sockets are a facility that permit firewalls to transmit a
    copy of a packet to a userspace process. They may also be used by
    userspace programs to inject packets into the IP packet processing
    stack. In the FreeBSD base system, the only user of divert(4) sockets
    is natd(8).

    II. Problem Description

    A bug in the error handling of transmission on a divert(4) socket could
    result in a double free of an mbuf.

    III. Impact

    Systems making use of divert(4) may misbehave or panic in a
    non-deterministic manner.

    IV. Workaround

    No workaround is available. Systems not making use of divert(4) sockets
    are unaffected. divert(4) sockets appear in sockstat(8) output as using protocol "div".

    V. Solution

    Upgrade your 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 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 an erratum update"

    2) To update your 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/EN-21:12/divert.patch
    # fetch https://security.FreeBSD.org/patches/EN-21:12/divert.patch.asc
    # gpg --verify divert.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/ eafeee082c50 stable/13-n245578 releng/13.0/ 22b58630d6ba releng/13.0-n244737
    - -------------------------------------------------------------------------

    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

    VII. References

    <URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255104>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:12.divert.asc> -----BEGIN PGP SIGNATURE-----

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