FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg

Fabricante: FreeBSD
Fecha: 18/05/2016
Identificador: FreeBSD-SA-16:19.sendmsg
FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg
-----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 . 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 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: VII. References The latest revision of this advisory is available at -----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-----