e6520ef815
Fix sendmail improper close-on-exec flag handling. [SA-14:11] Fix ktrace memory disclosure. [SA-14:12] Fix incorrect error handling in PAM policy parser. [SA-14:13] Fix triple-fault when executing from a threaded process. [EN-14:06]
137 lines
5.3 KiB
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137 lines
5.3 KiB
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=============================================================================
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FreeBSD-SA-14:11.sendmail Security Advisory
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The FreeBSD Project
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Topic: sendmail improper close-on-exec flag handling
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Category: contrib
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Module: sendmail
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Announced: 2014-06-03
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Affects: All supported versions of FreeBSD.
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Corrected: 2014-05-26 15:35:11 UTC (stable/10, 10.0-STABLE)
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2014-06-03 19:02:52 UTC (releng/10.0, 10.0-RELEASE-p4)
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2014-05-26 20:10:00 UTC (stable/9, 9.3-PRERELEASE)
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2014-06-03 19:03:11 UTC (releng/9.2, 9.2-RELEASE-p7)
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2014-06-03 19:03:11 UTC (releng/9.1, 9.1-RELEASE-p14)
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2014-05-26 15:30:27 UTC (stable/8, 8.4-STABLE)
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2014-06-03 19:03:23 UTC (releng/8.4, 8.4-RELEASE-p11)
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For general information regarding FreeBSD Security Advisories,
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including descriptions of the fields above, security branches, and the
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following sections, please visit <URL:http://security.FreeBSD.org/>.
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I. Background
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FreeBSD includes sendmail(8), a general purpose internetwork mail
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routing facility, as the default Mail Transfer Agent (MTA).
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FreeBSD uses file descriptor as an abstract indicator for accessing a file.
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Upon execve(2), file descriptors open in the calling process image remain
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open in the new process image, except for those for which the close-on-exec
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flag is set.
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II. Problem Description
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There is a programming error in sendmail(8) that prevented open file
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descriptors have close-on-exec properly set. Consequently a subprocess
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will be able to access all open files that the parent process have open.
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III. Impact
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A local user who can execute their own program for mail delivery will be
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able to interfere with an open SMTP connection.
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IV. Workaround
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Do not allow untrusted users to specify programs for mail delivery, for
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instance, procmail.
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Systems that do not use sendmail(8) MTA are not affected.
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V. Solution
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Perform one of the following:
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1) Upgrade your vulnerable system to a supported FreeBSD stable or
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release / security branch (releng) dated after the correction date.
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2) To update your vulnerable 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 http://security.FreeBSD.org/patches/SA-14:11/sendmail.patch
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# fetch http://security.FreeBSD.org/patches/SA-14:11/sendmail.patch.asc
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# gpg --verify sendmail.patch.asc
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b) Apply the patch. Execute the following commands as root:
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# cd /usr/src
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# patch < /path/to/patch
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c) Recompile the operating system using buildworld and installworld as
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described in <URL:http://www.FreeBSD.org/handbook/makeworld.html>.
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Restart the applicable daemons, or reboot the system.
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3) To update your vulnerable 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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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/8/ r266693
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releng/8.4/ r267019
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stable/9/ r266711
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releng/9.1/ r267018
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releng/9.2/ r267018
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stable/10/ r266692
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releng/10.0/ r267017
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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:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
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VII. References
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The latest revision of this advisory is available at
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<URL:http://security.FreeBSD.org/advisories/FreeBSD-SA-14:11.sendmail.asc>
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