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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-18:01.ipsec

    From FreeBSD Security Advisories@21:1/5 to All on Wed Mar 7 08:00:00 2018
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    ============================================================================= FreeBSD-SA-18:01.ipsec Security Advisory
    The FreeBSD Project

    Topic: ipsec validation and use-after-free

    Category: core
    Module: ipsec
    Announced: 2018-03-07
    Credits: Maxime Villard
    Affects: All supported versions of FreeBSD.
    Corrected: 2018-02-24 13:04:02 UTC (stable/11, 11.1-STABLE)
    2018-03-07 05:53:35 UTC (releng/11.1, 11.1-RELEASE-p7)
    2018-03-07 05:47:48 UTC (stable/10, 10.4-STABLE)
    2018-03-07 05:53:35 UTC (releng/10.4, 10.4-RELEASE-p6)
    2018-03-07 05:53:35 UTC (releng/10.3, 10.3-RELEASE-p27)
    CVE Name: CVE-2018-6916

    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 IPsec suite of protocols provide network level security for IPv4 and IPv6 packets. FreeBSD includes software originally developed by the KAME project which implements the various protocols that make up IPsec.

    In IPsec, the IP Authentication Header (AH) is used to provide protection against replay attacks and connectionless integrity and data origin authentication for IP datagrams.

    II. Problem Description

    Due to a lack of strict checking, an attacker from a trusted host can
    send a specially constructed IP packet that may lead to a system crash.

    Additionally, a use-after-free vulnerability in the AH handling code could cause unpredictable results.

    III. Impact

    Access to out of bounds or freed mbuf data can lead to a kernel panic or
    other unpredictable results.

    IV. Workaround

    No workaround is available, but systems not using IPsec are not vulnerable.

    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.
    And 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
    And 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 10.x]
    # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.patch
    # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-10.patch.asc
    # gpg --verify ipsec-10.patch.asc

    [FreeBSD 11.1]
    # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-11.patch
    # fetch https://security.FreeBSD.org/patches/SA-18:01/ipsec-11.patch.asc
    # gpg --verify ipsec-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/10/ r330565 releng/10.3/ r330566 releng/10.4/ r330566 stable/11/ r329907 releng/11.1/ r330566
    - -------------------------------------------------------------------------

    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-2018-6916>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-18:01.ipsec.asc> -----BEGIN PGP SIGNATURE-----

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