131 lines
4.9 KiB
Text
131 lines
4.9 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-20:03.thrmisc Security Advisory
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The FreeBSD Project
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Topic: kernel stack data disclosure
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Category: core
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Module: kernel
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Announced: 2020-01-28
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Credits: Ilja Van Sprundel
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Affects: All supported versions of FreeBSD.
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Corrected: 2019-11-15 16:40:10 UTC (stable/12, 12.1-STABLE)
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2020-01-28 18:57:45 UTC (releng/12.1, 12.1-RELEASE-p2)
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2020-01-28 18:57:45 UTC (releng/12.0, 12.0-RELEASE-p13)
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2019-11-15 16:40:55 UTC (stable/11, 11.3-STABLE)
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2020-01-28 18:57:45 UTC (releng/11.3, 11.3-RELEASE-p6)
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CVE Name: CVE-2019-15875
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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 kernel can create a core dump file when a process crashes that contains
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process state, for debugging.
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II. Problem Description
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Due to incorrect initialization of a stack data structure, up to 20 bytes of
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kernel data stored previously stored on the stack will be exposed to a
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crashing user process.
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III. Impact
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Sensitive kernel data may be disclosed.
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IV. Workaround
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Core dumps may be disabled by setting the kern.coredump sysctl to 0.
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See sysctl(8) and sysctl.conf(5).
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V. Solution
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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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and reboot.
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Perform one of the following:
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1) 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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# shutdown -r +10min "Rebooting for a security update"
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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 https://security.FreeBSD.org/patches/SA-20:03/thrmisc.patch
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# fetch https://security.FreeBSD.org/patches/SA-20:03/thrmisc.patch.asc
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# gpg --verify thrmisc.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 your kernel as described in
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<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
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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/ r354734
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releng/12.1/ r357219
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releng/12.0/ r357219
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stable/11/ r354735
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releng/11.3/ r357219
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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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15875>
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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-20:03.thrmisc.asc>
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