140 lines
5.3 KiB
Text
140 lines
5.3 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-16:25.bspatch Security Advisory
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The FreeBSD Project
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Topic: Heap vulnerability in bspatch
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Category: core
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Module: bsdiff
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Announced: 2016-07-25
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Affects: All supported versions of FreeBSD.
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Corrected: 2016-07-25 14:52:12 UTC (stable/11, 11.0-BETA2-p1)
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2016-07-25 14:52:12 UTC (stable/11, 11.0-BETA1-p1)
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2016-07-25 14:53:04 UTC (stable/10, 10.3-STABLE)
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2016-07-25 15:04:17 UTC (releng/10.3, 10.3-RELEASE-p6)
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2016-07-25 15:04:17 UTC (releng/10.2, 10.2-RELEASE-p20)
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2016-07-25 15:04:17 UTC (releng/10.1, 10.1-RELEASE-p37)
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2016-07-25 14:53:04 UTC (stable/9, 9.3-STABLE)
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2016-07-25 15:04:17 UTC (releng/9.3, 9.3-RELEASE-p45)
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CVE Name: CVE-2014-9862
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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:https://security.FreeBSD.org/>.
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I. Background
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The bspatch utility generates newfile from oldfile and patchfile where
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patchfile is a binary patch built by bsdiff(1).
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II. Problem Description
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The implementation of bspatch does not check for a negative value on numbers
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of bytes read from the diff and extra streams, allowing an attacker who
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can control the patch file to write at arbitrary locations in the heap.
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This issue was first discovered by The Chromium Project and reported
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independently by Lu Tung-Pin to the FreeBSD project.
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III. Impact
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An attacker who can control the patch file can cause a crash or run arbitrary
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code under the credentials of the user who runs bspatch, in many cases, root.
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IV. Workaround
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No workaround is available.
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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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No reboot is needed.
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2) 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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No reboot is needed.
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3) 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 https://security.FreeBSD.org/patches/SA-16:25/bspatch.patch
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# fetch https://security.FreeBSD.org/patches/SA-16:25/bspatch.patch.asc
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# gpg --verify bspatch.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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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/9/ r303301
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releng/9.3/ r303304
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stable/10/ r303301
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releng/10.1/ r303304
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releng/10.2/ r303304
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releng/10.3/ r303304
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stable/11/ r303300
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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.chromium.org/p/chromium/issues/detail?id=372525>
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<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9862>
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The latest revision of this advisory is available at
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<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:25.bspatch.asc>
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