137 lines
5.1 KiB
Text
137 lines
5.1 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
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Hash: SHA512
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=============================================================================
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FreeBSD-SA-19:19.mldv2 Security Advisory
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The FreeBSD Project
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Topic: ICMPv6 / MLDv2 out-of-bounds memory access
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Category: core
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Module: net
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Announced: 2019-08-06
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Credits: CJD of Apple
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Affects: All supported versions of FreeBSD.
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Corrected: 2019-08-06 17:13:41 UTC (stable/12, 12.0-STABLE)
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2019-08-06 17:11:17 UTC (releng/12.0, 12.0-RELEASE-p9)
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2019-08-06 17:15:46 UTC (stable/11, 11.3-STABLE)
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2019-08-06 17:11:17 UTC (releng/11.3, 11.3-RELEASE-p2)
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2019-08-06 17:11:17 UTC (releng/11.2, 11.2-RELEASE-p13)
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CVE Name: CVE-2019-5608
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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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MLDv2 is the Multicast Listener Discovery protocol, version 2. It is used
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by IPv6 routers to discover multicast listeners.
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II. Problem Description
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The ICMPv6 input path incorrectly handles cases where an MLDv2 listener
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query packet is internally fragmented across multiple mbufs.
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III. Impact
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A remote attacker may be able to cause an out-of-bounds read or write that
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may cause the kernel to attempt to access an unmapped page and subsequently
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panic.
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IV. Workaround
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No workaround is available. Systems not using IPv6 are not affected.
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V. Solution
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Perform one of the following:
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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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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 "Reboot for 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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[FreeBSD 11.2, FreeBSD 11.3]
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# fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch
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# fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch.asc
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# gpg --verify mldv2.11.patch.asc
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[FreeBSD 12.0]
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# fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch
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# fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch.asc
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# gpg --verify mldv2.12.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/ r350648
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releng/12.0/ r350644
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stable/11/ r350650
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releng/11.3/ r350644
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releng/11.2/ r350644
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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-2019-5608>
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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-19:19.mldv2.asc>
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