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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:19.unbound

    From FreeBSD Security Advisories@21:1/5 to All on Wed Jul 8 22:00:02 2020
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    ============================================================================= FreeBSD-SA-20:19.unbound Security Advisory
    The FreeBSD Project

    Topic: Multiple vulnerabilities in unbound

    Category: contrib
    Module: unbound
    Announced: 2020-07-08
    Affects: All supported versions of FreeBSD.
    Corrected: 2020-05-24 16:47:27 UTC (stable/12, 12.1-STABLE)
    2020-07-08 20:25:06 UTC (releng/12.1, 12.1-RELEASE-p7)
    2020-05-24 11:47:27 UTC (stable/11, 11.4-STABLE)
    2020-07-08 20:22:38 UTC (releng/11.4, 11.4-RELEASE-p1)
    2020-07-08 20:20:59 UTC (releng/11.3, 11.3-RELEASE-p11)
    CVE Name: CVE-2020-12662, CVE-2020-12663

    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

    Unbound is a validating, recursive, and caching DNS resolver.

    II. Problem Description

    Malformed answers from upstream name servers can send Unbound into an infinite loop, resulting in denial of service. A malicious query can cause a traffic amplification attack against third party authoritative nameservers.

    III. Impact

    Denial of service of the affected host, or of third parties via traffic amplification.

    IV. Workaround

    No workaround is available. Systems not running Unbound are not affected.

    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

    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 12.1]
    # fetch https://security.FreeBSD.org/patches/SA-20:19/unbound.12.1.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:19/unbound.12.1.patch.asc
    # gpg --verify unbound.12.1.patch.asc

    [FreeBSD 11.4]
    # fetch https://security.FreeBSD.org/patches/SA-20:19/unbound.11.4.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:19/unbound.11.4.patch.asc
    # gpg --verify unbound.11.4.patch.asc

    [FreeBSD 11.3]
    # fetch https://security.FreeBSD.org/patches/SA-20:19/unbound.11.3.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:19/unbound.11.3.patch.asc
    # gpg --verify unbound.11.3.patch.asc

    b) Apply the patch. Execute the following commands as root:

    # cd /usr/src
    # patch -p0 < /path/to/patch

    c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

    Restart the applicable daemons, or reboot the system.

    VI. Correction details

    The following list contains the correction revision numbers for each
    affected branch.

    Branch/path Revision
    - ------------------------------------------------------------------------- stable/12/ r361435 releng/12.1/ r363029 stable/11/ r361435 releng/11.4/ r363028 releng/11.3/ r363027
    - -------------------------------------------------------------------------

    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://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_2020-12663.txt>

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12662>

    <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12663>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:19.unbound.asc> -----BEGIN PGP SIGNATURE-----

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