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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-18:13.nfs

    From FreeBSD Security Advisories@21:1/5 to All on Tue Nov 27 22:00:00 2018
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    ============================================================================= FreeBSD-SA-18:13.nfs Security Advisory
    The FreeBSD Project

    Topic: Multiple vulnerabilities in NFS server code

    Category: core
    Module: nfs
    Announced: 2018-11-27
    Credits: Jakub Jirasek, Secunia Research at Flexera
    Affects: All supported versions of FreeBSD.
    Corrected: 2018-11-23 20:41:54 UTC (stable/11, 11.2-STABLE)
    2018-11-27 19:42:16 UTC (releng/11.2, 11.2-RELEASE-p5)
    CVE Name: CVE-2018-17157, CVE-2018-17158, CVE-2018-17159

    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 Network File System (NFS) allows a host to export some or all of its file systems so that other hosts can access them over the network and mount them
    as if they were local. FreeBSD includes both server and client
    implementations of NFS.

    II. Problem Description

    Insufficient and improper checking in the NFS server code could cause a
    denial of service or possibly remote code execution via a specially crafted network packet.

    III. Impact

    A remote attacker could cause the NFS server to crash, resulting in a denial
    of service, or possibly execute arbitrary code on the server.

    IV. Workaround

    No workaround is available, but systems that do not provide NFS services are not vulnerable.

    Additionally, it is highly recommended the NFS service port (default port number 2049) is protected via a host or network based firewall to prevent arbitrary, untrusted clients from being able to connect.

    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.

    [FreeBSD 11.2]
    # fetch https://security.FreeBSD.org/patches/SA-18:13/nfs.patch
    # fetch https://security.FreeBSD.org/patches/SA-18:13/nfs.patch.asc
    # gpg --verify nfs.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/11/ r340854 releng/11.2/ r341088
    - -------------------------------------------------------------------------

    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://www.flexerasoftware.com/enterprise/company/about/secunia-research/>

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-17157> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-17158> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-17159>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:13.nfs.asc> -----BEGIN PGP SIGNATURE-----

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