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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:10.ipfw

    From FreeBSD Security Advisories@21:1/5 to All on Tue Apr 21 17:00:01 2020
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    ============================================================================= FreeBSD-SA-20:10.ipfw Security Advisory
    The FreeBSD Project

    Topic: ipfw invalid mbuf handling

    Category: core
    Module: kernel
    Announced: 2020-04-21
    Credits: Maxime Villard
    All supported versions of FreeBSD.
    Corrected: 2019-12-23 10:02:55 UTC (stable/12, 12.1-STABLE)
    2020-04-21 15:52:22 UTC (releng/12.1, 12.1-RELEASE-p4)
    2019-12-23 10:06:32 UTC (stable/11, 11.3-STABLE)
    2020-04-21 15:52:22 UTC (releng/11.3, 11.3-RELEASE-p8)
    CVE Name: CVE-2019-5614, CVE-2019-15874


    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

    The ipfw system facility allows filtering, redirecting, and other operations
    on IP packets travelling through network interfaces.

    II. Problem Description

    Incomplete packet data validation may result in accessing out-of-bounds
    memory (CVE-2019-5614) or may access memory after it has been freed (CVE-2019-15874).

    III. Impact

    Access to out of bounds or freed mbuf data can lead to a kernel panic or
    other unpredictable results.

    IV. Workaround

    No workaround is available. Systems not using the ipfw firewall are
    not vulnerable.

    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 i386 or amd64
    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 11.3]
    # fetch https://security.FreeBSD.org/patches/SA-20:10/ipfw.11.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:10/ipfw.11.patch.asc
    # gpg --verify ipfw.11.patch.asc

    [FreeBSD 12.1]
    # fetch https://security.FreeBSD.org/patches/SA-20:10/ipfw.12.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:10/ipfw.12.patch.asc
    # gpg --verify ipfw.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 <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
    system.

    VI. Correction details

    The following list contains the correction revision numbers for each
    affected branch.

    Branch/path Revision
    - ------------------------------------------------------------------------- stable/12/ r356035 releng/12.1/ r360149 stable/11/ r356036 releng/11.3/ r360149
    - -------------------------------------------------------------------------

    To see which files were modified by a particular revision, run the
    following command, replacing NNNNNN with the revision number, on a
    machine with Subversion installed:

    # 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

    <other info on vulnerability>

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5614> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15874>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:10.ipfw.asc> -----BEGIN PGP SIGNATURE-----

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