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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3034.2 ICMPv6 / MLDv2 out-of-bounds memory access 25 October 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: mldv2 Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-5608 Original Bulletin: https://security.freebsd.org/advisories/FreeBSD-SA-19:19.mldv2.asc Comment: This bulletin contains two (2) FreeBSD security advisories. Revision History: October 25 2019: Vendor updated advisory FreeBSD-SA-19:19.mldv2 August 9 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:19.mldv2 Security Advisory The FreeBSD Project Topic: ICMPv6 / MLDv2 out-of-bounds memory access Category: core Module: net Announced: 2019-08-06 Credits: CJD of Apple Affects: All supported versions of FreeBSD. Corrected: 2019-08-06 17:13:41 UTC (stable/12, 12.0-STABLE) 2019-08-06 17:11:17 UTC (releng/12.0, 12.0-RELEASE-p9) 2019-08-06 17:15:46 UTC (stable/11, 11.3-STABLE) 2019-08-06 17:11:17 UTC (releng/11.3, 11.3-RELEASE-p2) 2019-08-06 17:11:17 UTC (releng/11.2, 11.2-RELEASE-p13) CVE Name: CVE-2019-5608 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background MLDv2 is the Multicast Listener Discovery protocol, version 2. It is used by IPv6 routers to discover multicast listeners. II. Problem Description The ICMPv6 input path incorrectly handles cases where an MLDv2 listener query packet is internally fragmented across multiple mbufs. III. Impact A remote attacker may be able to cause an out-of-bounds read or write that may cause the kernel to attempt to access an unmapped page and subsequently panic. IV. Workaround No workaround is available. Systems not using IPv6 are not affected. V. Solution Perform one of the following: Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Reboot for security update" 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 11.2, FreeBSD 11.3] # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch.asc # gpg --verify mldv2.11.patch.asc [FreeBSD 12.0] # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch.asc # gpg --verify mldv2.12.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r350648 releng/12.0/ r350644 stable/11/ r350650 releng/11.3/ r350644 releng/11.2/ r350644 - - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5608> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:19.mldv2.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl1Jt1RfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cLzTA/+OyyukXWH7rfwMhOlpD60UH4hxN3purvdNeBe4ZxlYvtf8gSUzS1VbK5r NR9D2HiYRlmaePOil5myan6cVkrKoANoWTrQsCcsFLe6KKbiKlQDx/btbENmCMsR VoS0ZPx3l9iGuVUwDk6k1JXwKCcO3U3dCDYEI941hEKxYadR+twUP3JOceg8Zn0h oODXW7LcPXWQKAyFc0Kun1VrjrUGdRGfqk30joR20GP2IjgQceFHKUbiOyBbbIjW +UVvp2wPBxXvcXNPTpcIpTW5UGJBHCT2OsDulh7hqpiWf78VE8BoksKAvDjtI4i0 15fmwn7tmQ3aGWK3WoaKWUOXZUlKrxRQDzGyAZ3LzOqPWhv12tJjNJhjnRmCVLfo +F4I/MHzPgjitZhv8gfn+MRiPG4E1ueAYnPQWiR3qRCLQGhemVdKZIAVnYg6NGpQ Jgsr1QS8/3GHZ8yrMXUOSNOSuiMmRHbI9915vVzu+hWkfnrCcSr3uVkJeQvx4CZJ gdTL083Knnkdo4IPOdHWnQjGfrv2rGRyvCJ88m/DIC6hw4weR1LyFWMEHeJCEcJl 5LHiVWmOUJE4ltJXrRoXwxuh9Dia0Mq6KfNA0343JFpQF9rdt3JQ/54FPGtK6NUO LyX5a42RIKRxWNTN+ADrSk8czbHFIg8MfTwpjiRGx2rYtxjp1qU= =WaXC - -----END PGP SIGNATURE----- ============================================================================== - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:19.mldv2 Security Advisory The FreeBSD Project Topic: ICMPv6 / MLDv2 out-of-bounds memory access Category: core Module: net Announced: 2019-08-06 Credits: CJD of Apple Affects: All supported versions of FreeBSD. Corrected: 2019-08-06 17:13:41 UTC (stable/12, 12.0-STABLE) 2019-08-06 17:11:17 UTC (releng/12.0, 12.0-RELEASE-p9) 2019-08-06 17:15:46 UTC (stable/11, 11.3-STABLE) 2019-08-06 17:11:17 UTC (releng/11.3, 11.3-RELEASE-p2) 2019-08-06 17:11:17 UTC (releng/11.2, 11.2-RELEASE-p13) CVE Name: CVE-2019-5608 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background MLDv2 is the Multicast Listener Discovery protocol, version 2. It is used by IPv6 routers to discover multicast listeners. II. Problem Description The ICMPv6 input path incorrectly handles cases where an MLDv2 listener query packet is internally fragmented across multiple mbufs. III. Impact A remote attacker may be able to cause an out-of-bounds read or write that may cause the kernel to attempt to access an unmapped page and subsequently panic. IV. Workaround No workaround is available. Systems not using IPv6 are not affected. V. Solution Perform one of the following: Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date, and reboot. 1) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install # shutdown -r +10min "Reboot for security update" 2) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. [FreeBSD 11.2, FreeBSD 11.3] # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.11.patch.asc # gpg --verify mldv2.11.patch.asc [FreeBSD 12.0] # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch # fetch https://security.FreeBSD.org/patches/SA-19:19/mldv2.12.patch.asc # gpg --verify mldv2.12.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r350648 releng/12.0/ r350644 stable/11/ r350650 releng/11.3/ r350644 releng/11.2/ r350644 - - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5608> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:19.mldv2.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl1Jt1RfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cLzTA/+OyyukXWH7rfwMhOlpD60UH4hxN3purvdNeBe4ZxlYvtf8gSUzS1VbK5r NR9D2HiYRlmaePOil5myan6cVkrKoANoWTrQsCcsFLe6KKbiKlQDx/btbENmCMsR VoS0ZPx3l9iGuVUwDk6k1JXwKCcO3U3dCDYEI941hEKxYadR+twUP3JOceg8Zn0h oODXW7LcPXWQKAyFc0Kun1VrjrUGdRGfqk30joR20GP2IjgQceFHKUbiOyBbbIjW +UVvp2wPBxXvcXNPTpcIpTW5UGJBHCT2OsDulh7hqpiWf78VE8BoksKAvDjtI4i0 15fmwn7tmQ3aGWK3WoaKWUOXZUlKrxRQDzGyAZ3LzOqPWhv12tJjNJhjnRmCVLfo +F4I/MHzPgjitZhv8gfn+MRiPG4E1ueAYnPQWiR3qRCLQGhemVdKZIAVnYg6NGpQ Jgsr1QS8/3GHZ8yrMXUOSNOSuiMmRHbI9915vVzu+hWkfnrCcSr3uVkJeQvx4CZJ gdTL083Knnkdo4IPOdHWnQjGfrv2rGRyvCJ88m/DIC6hw4weR1LyFWMEHeJCEcJl 5LHiVWmOUJE4ltJXrRoXwxuh9Dia0Mq6KfNA0343JFpQF9rdt3JQ/54FPGtK6NUO LyX5a42RIKRxWNTN+ADrSk8czbHFIg8MfTwpjiRGx2rYtxjp1qU= =WaXC - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXbJNUmaOgq3Tt24GAQiJcA//bPaKi5AyNzdlLoAYFl5fFqjGoAM2SU1g RyZ5Zwf4EJKKrmx1wDQSih0+mdf7rlWCwUeajIGgS8/Xdmm3hLxNOq21irXp6L0F wlFgwareo1zi0RyYzxfrJ89eUoTk2Jh9kyLO01Pk360KTwiO7JFezB8306e5cwu0 J95B4XzGjylmAq38KCsMMkPjaMGMhWgVWxteEPAtIWIn/HZenAwkAF2bKyFND38K HRR1kHUIlPRrGzvckTnYvUAEYj9shDMTycKftFdk5EN6RdosudE+WW+4sp6nesTt W5iMMzyC1yB5ae69ftmjCE6RPJkUIZ9NTmtYQTrUn6dAJ9ZzhXjEUcdRZ88LLbd4 O4CnorafCD3dwf79sT09VohS693EwaSCgDH+n/85lk9EUgCCO139L/ccZ1+YrsiE iM8oEqDKy5xpIE40s/RGzXdfAM4TkRv+HxQF0Usb4HAghyo8CYF7NEI7SNIxol8d GklSAzsFvp9WDiNga9ca/f19p0aZ0MmZEMvaMffWp0KdPXAQPd8atLZa5d09jq+0 K59+KwShVWHZ9MhJk8ltYxX79ajBbgplCVgPmP7b4Wb1joa7ChfdEArA+xilDtj5 sRQ0JhBNrJw47rkatcEUzN50f0KJryUTB4tVIipNI2vxQzvghSVQFT6TMZP1M53b khkLBRDES4Q= =9aNC -----END PGP SIGNATURE-----