119 lines
4.2 KiB
Text
119 lines
4.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-20:03.sshd Errata Notice
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The FreeBSD Project
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Topic: Misleading log messages upon successful sshd login
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Category: contrib
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Module: sshd
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Announced: 2020-03-19
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Affects: FreeBSD 12.1
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Corrected: 2019-11-28 02:18:19 UTC (stable/12, 12.1-STABLE)
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2020-03-19 16:34:11 UTC (releng/12.1, 12.1-RELEASE-p3)
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For general information regarding FreeBSD Errata Notices and Security
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Advisories, including descriptions of the fields above, security
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branches, and the following sections, please visit
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<URL:https://security.FreeBSD.org/>.
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I. Background
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The sshd server implements the secure shell protocol, providing remote
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access.
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II. Problem Description
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Due to a programming error, error messages of the form "Failed unknown for
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user <user> ..." will be emitted to auth.log for successful logins.
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III. Impact
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Log files will be confusing, and programs like fail2ban that parse logs will
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not function correctly.
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IV. Workaround
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No workaround is available.
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V. Solution
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Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date, and restart the sshd
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service.
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Perform one of the following:
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1) To update your system via a binary patch:
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Systems running a RELEASE version of FreeBSD on the i386 or amd64
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platforms can be updated via the freebsd-update(8) utility:
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# freebsd-update fetch
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# freebsd-update install
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# nohup service sshd restart
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2) To update your system via a source code patch:
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The following patches have been verified to apply to the applicable
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FreeBSD release branches.
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a) Download the relevant patch from the location below, and verify the
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detached PGP signature using your PGP utility.
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# fetch https://security.FreeBSD.org/patches/EN-20:03/sshd.patch
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# fetch https://security.FreeBSD.org/patches/EN-20:03/sshd.patch.asc
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# gpg --verify sshd.patch.asc
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c) Recompile the operating system using buildworld and installworld as
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described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the applicable daemons, or reboot the system.
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VI. Correction details
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The following list contains the correction revision numbers for each
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affected branch.
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Branch/path Revision
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- -------------------------------------------------------------------------
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stable/12/ r355160
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releng/12.1/ r359134
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- -------------------------------------------------------------------------
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To see which files were modified by a particular revision, run the
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following command, replacing NNNNNN with the revision number, on a
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machine with Subversion installed:
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# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
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Or visit the following URL, replacing NNNNNN with the revision number:
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<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234793>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:03.sshd.asc>
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