• [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-20:03.sshd

    From FreeBSD Errata Notices@21:1/5 to All on Thu Mar 19 18:00:00 2020
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    ============================================================================= FreeBSD-EN-20:03.sshd Errata Notice
    The FreeBSD Project

    Topic: Misleading log messages upon successful sshd login

    Category: contrib
    Module: sshd
    Announced: 2020-03-19
    Affects: FreeBSD 12.1
    Corrected: 2019-11-28 02:18:19 UTC (stable/12, 12.1-STABLE)
    2020-03-19 16:34:11 UTC (releng/12.1, 12.1-RELEASE-p3)

    For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security
    branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>.

    I. Background

    The sshd server implements the secure shell protocol, providing remote
    access.

    II. Problem Description

    Due to a programming error, error messages of the form "Failed unknown for
    user <user> ..." will be emitted to auth.log for successful logins.

    III. Impact

    Log files will be confusing, and programs like fail2ban that parse logs will not function correctly.

    IV. Workaround

    No workaround is available.

    V. Solution

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

    Perform one of the following:

    1) To update your 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
    # nohup service sshd restart

    2) To update your 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/EN-20:03/sshd.patch
    # fetch https://security.FreeBSD.org/patches/EN-20:03/sshd.patch.asc
    # gpg --verify sshd.patch.asc

    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/ r355160 releng/12.1/ r359134
    - -------------------------------------------------------------------------

    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://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234793>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:03.sshd.asc> -----BEGIN PGP SIGNATURE-----

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