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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-19:19.mldv2

    From FreeBSD Security Advisories@21:1/5 to All on Tue Aug 13 05:48:38 2019
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    ============================================================================= FreeBSD-SA-19:19.mldv2 Security Advisory
    The FreeBSD Project

    Topic: ICMPv6 / MLDv2 out-of-bounds memory access

    Category: core
    Module: net
    Announced: 2019-08-06
    Credits: CJD of Apple
    Affects: All supported versions of FreeBSD.
    Corrected: 2019-08-06 17:13:41 UTC (stable/12, 12.0-STABLE)
    2019-08-06 17:11:17 UTC (releng/12.0, 12.0-RELEASE-p9)
    2019-08-06 17:15:46 UTC (stable/11, 11.3-STABLE)
    2019-08-06 17:11:17 UTC (releng/11.3, 11.3-RELEASE-p2)
    2019-08-06 17:11:17 UTC (releng/11.2, 11.2-RELEASE-p13)
    CVE Name: CVE-2019-5608

    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

    MLDv2 is the Multicast Listener Discovery protocol, version 2. It is used
    by IPv6 routers to discover multicast listeners.

    II. Problem Description

    The ICMPv6 input path incorrectly handles cases where an MLDv2 listener
    query packet is internally fragmented across multiple mbufs.

    III. Impact

    A remote attacker may be able to cause an out-of-bounds read or write that
    may cause the kernel to attempt to access an unmapped page and subsequently panic.

    IV. Workaround

    No workaround is available. Systems not using IPv6 are not affected.

    V. Solution

    Perform one of the following:

    Upgrade your vulnerable system to a supported FreeBSD stable or
    release / security branch (releng) dated after the correction date,
    and reboot.

    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 "Reboot for 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 11.2, FreeBSD 11.3]
    # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch.asc
    # gpg --verify mldv2.11.patch.asc

    [FreeBSD 12.0]
    # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch.asc
    # gpg --verify mldv2.12.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/ r350648 releng/12.0/ r350644 stable/11/ r350650 releng/11.3/ r350644 releng/11.2/ r350644
    - -------------------------------------------------------------------------

    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

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5608>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:19.mldv2.asc> -----BEGIN PGP SIGNATURE-----

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