• [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-18:05.mem

    From FreeBSD Errata Notices@21:1/5 to All on Tue May 8 18:00:00 2018
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    ============================================================================= FreeBSD-EN-18:05.mem Errata Notice
    The FreeBSD Project

    Topic: Multiple small kernel memory disclosures

    Category: core
    Module: kernel
    Announced: 2018-05-08
    Credits: Ilja van Sprundel, IOActive
    Vlad Tsyrklevich
    Affects: All supported versions of FreeBSD.
    Corrected: 2018-04-08 20:50:16 UTC (stable/11, 11.1-STABLE)
    2018-05-08 17:14:54 UTC (releng/11.1, 11.1-RELEASE-p10)
    2018-04-09 12:55:09 UTC (stable/10, 10.4-STABLE)
    2018-05-08 17:14:54 UTC (releng/10.4, 10.4-RELEASE-p9)
    CVE Name: CVE-2018-6920, CVE-2018-6921

    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

    FreeBSD includes drivers for Atheros wireless interfaces, a TCP network
    stack, and the ability to execute Linux binaries.

    II. Problem Description

    Due to insufficient initialization of memory copied to userland in the components described above small amounts of kernel memory may be disclosed
    to userland processes.

    The disclosure in the Atheros wireless driver and Linux subsystem applies to both FreeBSD 10.x and 11.x (CVE-2018-6920).

    The disclosure in the TCP network stack was introduced in 11.0. As such,
    only FreeBSD 11.x is affected by this issue (CVE-2018-6921).

    III. Impact

    A user who can access these drivers, use TCP sockets, or execute Linux
    binaries may be able to read the contents of small portions of kernel memory.

    Such memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way; for example,
    a terminal buffer might include a user-entered password.

    IV. Workaround

    No workaround is available.

    V. Solution

    Perform one of the following:

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

    Afterward, reboot the system.

    2) To update your 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

    Afterward, reboot the system.

    3) 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.

    [FreeBSD 11.1]
    # fetch https://security.FreeBSD.org/patches/EN-18:05/mem.11.1.patch
    # fetch https://security.FreeBSD.org/patches/EN-18:05/mem.11.1.patch.asc
    # gpg --verify mem.11.1.patch.asc

    [FreeBSD 10.4]
    # fetch https://security.FreeBSD.org/patches/EN-18:05/mem.10.4.patch
    # fetch https://security.FreeBSD.org/patches/EN-18:05/mem.10.4.patch.asc
    # gpg --verify mem.10.4.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/10/ r332321 releng/10.4/ r333372 stable/11/ r332303 releng/11.1/ r333372
    - -------------------------------------------------------------------------

    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-2018-6920>

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-6921>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-18:05.mem.asc> -----BEGIN PGP SIGNATURE-----

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