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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:06.if_ixl_io

    From FreeBSD Security Advisories@21:1/5 to All on Thu Mar 19 18:00:02 2020
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    ============================================================================= FreeBSD-SA-20:06.if_ixl_ioctl Security Advisory
    The FreeBSD Project

    Topic: Insufficient ixl(4) ioctl(2) privilege checking

    Category: core
    Module: ixl(4)
    Announced: 2020-03-19
    Credits: Ilja Van Sprundel
    Affects: All supported versions of FreeBSD.
    Corrected: 2020-01-10 18:31:59 UTC (stable/12, 12.1-STABLE)
    2020-03-19 16:49:32 UTC (releng/12.1, 12.1-RELEASE-p3)
    CVE Name: CVE-2019-15877

    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 primary interface used for network driver configuration is ioctl(2). Several ioctl(2) commands are reserved for driver-specific purposes. For instance, a driver may use one of these ioctls to implement an interface for updating device firmware.

    II. Problem Description

    The driver-specific ioctl(2) command handlers in ixl(4) failed to check
    whether the caller has sufficient privileges to perform the corresponding operation.

    III. Impact

    The ixl(4) handler permits unprivileged users to trigger updates to the device's non-volatile memory (NVM).

    IV. Workaround

    No workaround is available. Systems that do not contain devices driven by ixl(4) are unaffected.

    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"

    3) 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-20:06/if_ixl_ioctl.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:06/if_ixl_ioctl.patch.asc
    # gpg --verify if_ixl_ioctl.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/ r356606 releng/12.1/ r359140
    - -------------------------------------------------------------------------

    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-2019-15877>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:06.if_ixl_ioctl.asc> -----BEGIN PGP SIGNATURE-----

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