FreeBSD Security Advisories
2016-May-17 22:40 UTC
[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg
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============================================================================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>
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Alan Somers
2016-May-17 22:59 UTC
[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg
I think you put the wrong revision numbers in here. Revision 300093 is the kbd fix for stable/9. 300092 is the right revision for the sendmsg fix in stable/10. On Tue, May 17, 2016 at 4:40 PM, FreeBSD Security Advisories < security-advisories at freebsd.org> wrote:> -----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----- > _______________________________________________ > freebsd-announce at freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-announce > To unsubscribe, send any mail to "freebsd-announce-unsubscribe at freebsd.org > " >