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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-19:16.bhyve

    From FreeBSD Security Advisories@21:1/5 to All on Tue Aug 13 05:48:37 2019
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    ============================================================================= FreeBSD-SA-19:16.bhyve Security Advisory
    The FreeBSD Project

    Topic: Bhyve out-of-bounds read in XHCI device

    Category: core
    Module: bhyve
    Announced: 2019-07-24
    Credits: Reno Robert
    Affects: All supported versions of FreeBSD.
    Corrected: 2019-07-23 17:48:37 UTC (stable/12, 12.0-STABLE)
    2019-07-24 12:56:06 UTC (releng/12.0, 12.0-RELEASE-p8)
    2019-07-23 17:48:37 UTC (stable/11, 11.2-STABLE)
    2019-07-24 12:56:06 UTC (releng/11.2, 11.2-RELEASE-p12)
    2019-07-24 12:56:06 UTC (releng/11.3, 11.3-RELEASE-p1)
    CVE Name: CVE-2019-5604

    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

    bhyve(8) is a hypervisor that supports running a variety of virtual
    machines (guests). bhyve includes an emulated XHCI device.

    II. Problem Description

    The pci_xhci_device_doorbell() function does not validate the 'epid' and 'streamid' provided by the guest, leading to an out-of-bounds read.

    III. Impact

    A misbehaving bhyve guest could crash the system or access memory that
    it should not be able to.

    IV. Workaround

    No workaround is available, however systems not using bhyve(8) for virtualization are not vulnerable.

    V. Solution

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

    No reboot is required. Rather the bhyve(8) process for vulnerable virtual machines should be restarted.

    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

    Restart any bhyve virtual machines or reboot the system.

    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.

    # fetch https://security.FreeBSD.org/patches/SA-19:16/bhyve.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:16/bhyve.patch.asc
    # gpg --verify bhyve.patch.asc

    b) Apply the patch. Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch

    c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

    Restart any bhyve virtual machines, or reboot the system.

    VI. Correction details

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

    Branch/path Revision
    - ------------------------------------------------------------------------- stable/12/ r350246 releng/12.0/ r350285 stable/11/ r350247 releng/11.2/ r350285 releng/11.3/ r350285
    - -------------------------------------------------------------------------

    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-2019-5604>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:16.bhyve.asc> -----BEGIN PGP SIGNATURE-----

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