144 lines
5.4 KiB
Text
144 lines
5.4 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-EN-18:02.file Errata Notice
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The FreeBSD Project
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Topic: Version and security update of file(1) and libmagic(3)
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Category: contrib
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Module: file
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Announced: 2018-03-07
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Affects: All supported versions of FreeBSD.
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Corrected: 2018-02-05 08:20:11 UTC (stable/11, 11.1-STABLE)
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2018-03-07 06:04:25 UTC (releng/11.1, 11.1-RELEASE-p7)
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2018-02-05 08:50:34 UTC (stable/10, 10.4-STABLE)
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2018-03-07 06:04:25 UTC (releng/10.4, 10.4-RELEASE-p6)
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2018-03-07 06:04:25 UTC (releng/10.3, 10.3-RELEASE-p27)
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CVE Name: CVE-2017-1000249
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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 file(1) utility attempts to classify file system objects based on
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filesystem, magic number and language tests.
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The libmagic(3) library provides most of the functionality of file(1) and
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may be used by other applications.
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II. Problem Description
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The file(1) utility contains a stack based buffer overflow when parsing
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a specially crafted input file.
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III. Impact
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The issue lets an attacker overwrite a fixed 20 bytes stack buffer with
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with a specially crafted .notes section in an ELF binary file.
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IV. Workaround
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No workaround is available, but systems where file(1) and other applications
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using libmagic(3) are never run on untrusted input are not vulnerable.
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V. Solution
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Perform one of the following:
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1) Upgrade your system to a supported FreeBSD stable or release / security
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branch (releng) dated after the correction date.
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2) 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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3) 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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[FreeBSD 10.3]
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# fetch https://security.FreeBSD.org/patches/EN-18:02/file-10.3.patch
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# fetch https://security.FreeBSD.org/patches/EN-18:02/file-10.3.patch.asc
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# gpg --verify file-10.3.patch.asc
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[FreeBSD 10.4]
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# fetch https://security.FreeBSD.org/patches/EN-18:02/file-10.4.patch
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# fetch https://security.FreeBSD.org/patches/EN-18:02/file-10.4.patch.asc
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# gpg --verify file-10.4.patch.asc
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[FreeBSD 11.1]
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# fetch https://security.FreeBSD.org/patches/EN-18:02/file-11.patch
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# fetch https://security.FreeBSD.org/patches/EN-18:02/file-11.patch.asc
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# gpg --verify file-11.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:https://www.FreeBSD.org/handbook/makeworld.html>.
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Restart all daemons that use the library, 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/10/ r328875
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releng/10.3/ r330569
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releng/10.4/ r330569
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stable/11/ r328874
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releng/11.1/ r330569
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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:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1000249>
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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-18:02.file.asc>
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