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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-19:17.fd

    From FreeBSD Security Advisories@21:1/5 to All on Tue Aug 13 05:48:37 2019
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    ============================================================================= FreeBSD-SA-19:17.fd Security Advisory
    The FreeBSD Project

    Topic: File description reference count leak

    Category: core
    Module: unix
    Announced: 2019-07-24
    Credits: Mark Johnston
    Affects: All supported versions of FreeBSD.
    Corrected: 2019-07-22 19:25:05 UTC (stable/12, 12.0-STABLE)
    2019-07-24 12:57:49 UTC (releng/12.0, 12.0-RELEASE-p8)
    2019-07-22 19:27:23 UTC (stable/11, 11.2-STABLE)
    2019-07-24 12:57:49 UTC (releng/11.2, 11.2-RELEASE-p12)
    2019-07-24 12:57:49 UTC (releng/11.3, 11.3-RELEASE-p1)
    CVE Name: CVE-2019-5607

    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

    UNIX-domain sockets are used for inter-process communication. It is
    possible to use UNIX-domain sockets to transfer rights, encoded as file descriptors, to another process. Rights are encapsulated in control
    messages, and multiple such messages may be transmitted with a single
    system call.

    II. Problem Description

    If a process attempts to transmit rights over a UNIX-domain socket and
    an error causes the attempt to fail, references acquired on the rights
    are not released and are leaked. This bug can be used to cause the
    reference counter to wrap around and free the corresponding file
    structure.

    III. Impact

    A local user can exploit the bug to gain root privileges or escape from
    a jail.

    IV. Workaround

    No workaround is available.

    V. Solution

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

    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 11.2]
    # fetch https://security.FreeBSD.org/patches/SA-19:17/fd.11.2.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:17/fd.11.2.patch.asc
    # gpg --verify fd.11.2.patch.asc

    [FreeBSD 11.3]
    # fetch https://security.FreeBSD.org/patches/SA-19:17/fd.11.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:17/fd.11.patch.asc
    # gpg --verify fd.11.patch.asc

    [FreeBSD 12.0]
    # fetch https://security.FreeBSD.org/patches/SA-19:17/fd.12.patch
    # fetch https://security.FreeBSD.org/patches/SA-19:17/fd.12.patch.asc
    # gpg --verify fd.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/ r350222 releng/12.0/ r350286 stable/11/ r350223 releng/11.2/ r350286 releng/11.3/ r350286
    - -------------------------------------------------------------------------

    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-2019-5607>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:17.fd.asc> -----BEGIN PGP SIGNATURE-----

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