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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:21.usb_net

    From FreeBSD Security Advisories@21:1/5 to All on Wed Aug 5 18:00:01 2020
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    ============================================================================= FreeBSD-SA-20:21.usb_net Security Advisory
    The FreeBSD Project

    Topic: Potential memory corruption in USB network device drivers

    Category: core
    Module: kernel
    Announced: 2020-08-05
    Credits: Ilja van Sprundel, IOActive
    Affects: All supported versions of FreeBSD.
    Corrected: 2020-06-14 05:25:06 UTC (stable/12, 12.1-STABLE)
    2020-08-05 17:11:18 UTC (releng/12.1, 12.1-RELEASE-p8)
    2020-06-14 05:27:37 UTC (stable/11, 11.4-STABLE)
    2020-08-05 17:11:18 UTC (releng/11.4, 11.4-RELEASE-p2)
    2020-08-05 17:11:18 UTC (releng/11.3, 11.3-RELEASE-p12)
    CVE Name: CVE-2020-7459

    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

    FreeBSD includes a number of USB Ethernet network interface device drivers, including:

    - smsc(4), supporting SMSC (now Microchip) devices
    - muge(4), supporting Microchip devices
    - cdceem(4), supporting USB Communication Device Class compatible devices

    II. Problem Description

    A missing length validation code common to these three drivers means that a malicious USB device could write beyond the end of an allocated network
    packet buffer.

    III. Impact

    An attacker with physical access to a USB port and the ability to bring a network interface up may be able to use a specially crafted USB device to
    gain kernel or user-space code execution.

    IV. Workaround

    No workaround is available. Systems with no active (i.e., UP) interface supported by any of the smsc(4), muge(4), and cdceem(4) drivers are not vulnerable.

    Exploitation likely requires malicious USB hardware that emulates hardware supported by one of these device drivers.

    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 12.x]
    # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.12.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.12.patch.asc
    # gpg --verify usb_net.12.patch.asc

    [FreeBSD 11.x]
    # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.11.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:21/usb_net.11.patch.asc
    # gpg --verify usb_net.11.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/ r362166 releng/12.1/ r363921 stable/11/ r362167 releng/11.4/ r363921 releng/11.3/ r363921
    - -------------------------------------------------------------------------

    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-2020-7459>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:21.usb_net.asc> -----BEGIN PGP SIGNATURE-----

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