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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:02.ipsec

    From FreeBSD Security Advisories@21:1/5 to All on Tue Jan 28 21:00:01 2020
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    ============================================================================= FreeBSD-SA-20:02.ipsec Security Advisory
    The FreeBSD Project

    Topic: Missing IPsec anti-replay window check

    Category: core
    Module: kernel
    Announced: 2020-01-28
    Credits: Jean-Francois HREN
    Affects: FreeBSD 12.0 only
    Corrected: 2020-01-28 18:56:46 UTC (releng/12.0, 12.0-RELEASE-p13)
    CVE Name: CVE-2019-5613

    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

    IPsec is a suite of protocols providing data authentication, integrity, and confidentiality between two networked hosts.

    II. Problem Description

    A missing check means that an attacker can reinject an old packet and it will be accepted and processed by the IPsec endpoint.

    III. Impact

    The impact depends on the higher-level protocols in use over IPsec. For example, an attacker who can capture and inject packets could cause an action that was intentionally performed once to be repeated.

    IV. Workaround

    No workaround is available. Systems not using IPsec are not vulnerable.

    V. Solution

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

    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.

    # fetch https://security.FreeBSD.org/patches/SA-20:02/ipsec.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:02/ipsec.patch.asc
    # gpg --verify ipsec.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
    - ------------------------------------------------------------------------- releng/12.0/ r357218
    - -------------------------------------------------------------------------

    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-2019-5613>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:02.ipsec.asc> -----BEGIN PGP SIGNATURE-----

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