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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-17:10.kldstat [

    From FreeBSD Security Advisories@21:1/5 to All on Tue Nov 21 05:00:00 2017
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    ============================================================================= FreeBSD-SA-17:10.kldstat Security Advisory
    The FreeBSD Project

    Topic: Information leak in kldstat(2)

    Category: core
    Module: kernel
    Announced: 2017-11-15
    Credits: Ilja van Sprundel
    TJ Corley
    Affects: All supported versions of FreeBSD.
    Corrected: 2017-11-15 22:34:15 UTC (stable/11, 11.1-STABLE)
    2017-11-15 22:49:47 UTC (releng/11.1, 11.1-RELEASE-p4)
    2017-11-15 22:50:20 UTC (releng/11.0, 11.0-RELEASE-p15)
    2017-11-15 22:35:16 UTC (stable/10, 10.4-STABLE)
    2017-11-15 22:50:47 UTC (releng/10.4, 10.4-RELEASE-p3)
    2017-11-15 22:51:08 UTC (releng/10.3, 10.3-RELEASE-p24)
    CVE Name: CVE-2017-1088

    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/>.

    0. Revision history

    v1.0 2017-11-15 Initial release.
    v1.1 2017-11-20 Corrected credit. Ilja van Sprundel first reported the
    issue to the project, but wasn't cited. The FreeBSD
    Security Team apologizes to Ilja for this oversight.

    I. Background

    The kldstat(2) syscall provides information about loaded kld files. The syscall takes a userland argument of struct kld_file_stat which is then
    filled with data about the kld file requested.

    II. Problem Description

    The kernel does not properly clear the memory of the kld_file_stat
    structure before filling the data. Since the structure filled by the
    kernel is allocated on the kernel stack and copied to userspace, a leak
    of information from the kernel stack is possible.

    III. Impact

    Some bytes from the kernel stack can be observed in userspace.

    IV. Workaround

    No workaround is available.

    V. Solution

    Perform one of the following:

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

    Afterward, reboot the system.

    2) 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

    Afterward, reboot the system.

    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-17:10/kldstat.patch
    # fetch https://security.FreeBSD.org/patches/SA-17:10/kldstat.patch.asc
    # gpg --verify kldstat.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/ r325867 releng/10.3/ r325878 releng/10.4/ r325877 stable/11/ r325866 releng/11.0/ r325876 releng/11.1/ r325875
    - -------------------------------------------------------------------------

    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-2017-1088>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:10.kldstat.asc> -----BEGIN PGP SIGNATURE-----

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