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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1247 Incorrect argument handling in sendmsg(2) 18 May 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: sendmsg Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-1887 Original Bulletin: https://security.freebsd.org/advisories/FreeBSD-SA-16:19.sendmsg.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-16:19.sendmsg Security Advisory The FreeBSD Project Topic: Incorrect argument handling in sendmsg(2) Category: core Module: kernel Announced: 2016-05-17 Credits: CTurt and the HardenedBSD team Affects: FreeBSD 10.x Corrected: 2016-05-17 22:30:43 UTC (stable/10, 10.3-STABLE) 2016-05-17 22:28:27 UTC (releng/10.3, 10.3-RELEASE-p3) 2016-05-17 22:28:20 UTC (releng/10.2, 10.2-RELEASE-p17) 2016-05-17 22:28:11 UTC (releng/10.1, 10.1-RELEASE-p34) CVE Name: CVE-2016-1887 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 The sendmsg(2) system call allows to send data to a socket. The data may be accompanied by optional ancillary data. II. Problem Description Incorrect argument handling in the socket code allows malicious local user to overwrite large portion of the kernel memory. III. Impact Malicious local user may crash kernel or execute arbitrary code in the kernel, potentially gaining superuser privileges. IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Reboot is required. 2) 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 Reboot is required. 3) 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. # fetch https://security.FreeBSD.org/patches/SA-16:19/sendmsg.patch # fetch https://security.FreeBSD.org/patches/SA-16:19/sendmsg.patch.asc # gpg --verify sendmsg.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/10/ r300093 releng/10.1/ r300085 releng/10.2/ r300086 releng/10.3/ r300087 - - ------------------------------------------------------------------------- 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:http://cturt.github.io/sendmsg.html> <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1887> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:19.sendmsg.asc> - -----BEGIN PGP SIGNATURE----- iQIcBAEBCgAGBQJXO50VAAoJEO1n7NZdz2rnWOAP/RyUks4Xf30YVGra+bHUjOsw gFQEJ7HNNJHkkaJ5l0LpVh87YQxr7VXnlddskDRcL6MDf7IjW5bkpw+875iEFz93 VykCN+1l84D0WlXAi9YZwg1GWoQs3SBfNpT1dtr9GuqJYAAeBfvMydJI1jHbJzJJ 7inDzgvhfPOaq8wQBfjXbUN0GgYiz6dJc3xir4+4JRw0C9sgzh1pI14o1oREJbZ0 glmHRCpuijndqluabl7rF19mSSDyF0AV7RqDCZIt7AkYHWvR1yLl4o0LGGBYCLXx iArz2ayzbAqBVw1JktVHzGx0HuVpobxb/yOpDuYBcaxtSL6riuSYrkzHp0Dca+JT 0/qENdMnXDN98ZMBcvVR66uWUuTVEF3/T2LXCi6G+RllrcoavvLqrcjghqT5k84P jmAjO3Q3rIeAinjArfyexHo/f/A5CHGJylsY0FZd41A35xWaYg/dd0cT+8qsoigD 65Ix+/6AOIjocqqQToFXiHKBCN5unwrn/UT5heU0K3ZqESGmxUrx+6yJ3mjDjtLh C7zWcNaJu1whcT7e4eKx9vMlAFFt6OrSnr1V09KnqPiHPtIu95PZhGlrizlZVELQ 8fKHoycOkT5F+00CWzcQuZK+l9p5iT5aWGkhunwvR7EKzqvgEFbDDpaJ5QzKTNTl lJXypb8SMlol4YY8Spdo =wuhi - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. 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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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 iQIVAwUBVzvKN36ZAP0PgtI9AQI08A/8Cu59cf6WKBusGfSBKNGpmCUxayvW9zfw xULEfq7wQApNc0Zt7GIBhrlTDgJxfRsVvQUYgkW4MY72aeXPZpI0AzdWUe3VSEzQ o8qxc9n1WJL+V4BlqbtFw8vuBJYKovlyg57XpZ8N94GjWRf5ZcxpHHs+OJ1li+N0 2o3n0gsaWCYXFZdzOR5rukR1bybQxunjHkJrKVShAuPbPzeKrE9ZFuqsGFmkuXNn T9q/035cAF5SMdy+uCy5+ewfxmhvfumPFwU3IZhkYihd8jQHwnqFM7mHEJIVJPbz B8z3lKKwtno3PrA9jzb3NeGDlUk8ZPv6ImwT4FKFP5pInsF2AMck/BbBfrbRPnso Q5bZXbvhhbIXpiqSS4C2PN9oBQMq8nkj8qSAtkHR4b9114b+hqYKrsG39MFfMtFA 9BVZ1D8W5inKtCg9Vcn/v8aJJoFYns0KB+ail1kzvpi2sJsDi92Tpf1wtvflsfLb iNxydizE9lmI4KEnHKrmd78PJQEamxzEpyupbAzk48yriUPBOTv9Z+OKxqKFVyrL 8Y+7pM93u8OqGDAqjO3CraAQhGq8RSQ+3nSjgwLyFHkfXeHT06HM7d/T/o5uWTZf oKCjlb5FFtJhwYOm5DZk1fDzmSSrKCwHf8KaO6if0r1BzWBmkEffwqZlTQR3zPuX U09452jcHxU= =aytz -----END PGP SIGNATURE-----