FreeBSD Security Advisory FreeBSD-SA-16:18.atkbd

18/05/16, FreeBSD Security Advisory FreeBSD-SA-16:18.atkbd
From: FreeBSD Security Advisories <security-advisories@freebsd.org>

Generated by MHonArc

CSIM Logo WelcomeCourses
Faculty, Student, Staff
Projects and reports
Conferences, workshop and seminars
Laboratories and reasearch facilities
Information related to CSIM
Information non-related to CSIM
Address, map, phone, etc.
Search

[Date Prev] [Date Next] [Thread Prev] [Thread Next] [Date Index] [Thread Index]


To: FreeBSD Security Advisories <security-advisories@freebsd.org>
Subject: FreeBSD Security Advisory FreeBSD-SA-16:18.atkbd
From: FreeBSD Security Advisories <security-advisories@freebsd.org>
Date: Tue, 17 May 2016 22:40:12 +0000 (UTC)
Delivered-to: on@cs.ait.ac.th
Delivered-to: freebsd-security-notifications@mailman.ysv.freebsd.org
List-archive: <http://lists.freebsd.org/pipermail/freebsd-security-notifications/>
List-help: <mailto:freebsd-security-notifications-request@freebsd.org?subject=help>
List-id: "Moderated Security Notifications \[moderated, low volume\]" <freebsd-security-notifications.freebsd.org>
List-post: <mailto:freebsd-security-notifications@freebsd.org>
List-subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications>, <mailto:freebsd-security-notifications-request@freebsd.org?subject=subscribe>
List-unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-security-notifications>, <mailto:freebsd-security-notifications-request@freebsd.org?subject=unsubscribe>
Reply-to: freebsd-security@freebsd.org
Sender: owner-freebsd-security-notifications@freebsd.org

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-16:18.atkbd	                                    Security Advisory
                                                          The FreeBSD Project

Topic:          Buffer overflow in keyboard driver

Category:       core
Module:         atkbd
Announced:      2016-05-17
Credits:        CTurt and the HardenedBSD team
Affects:        All supported versions of FreeBSD.
Corrected:      2016-05-17 22:29:59 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)
                2016-05-17 22:31:12 UTC (stable/9, 9.3-STABLE)
                2016-05-17 22:28:36 UTC (releng/9.3, 9.3-RELEASE-p42)
CVE Name:       CVE-2016-1886

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 atkbd(4) driver, together with the atkbdc(4) driver, provides access
to the AT 84 keyboard or the AT enhanced keyboard which is connected to
the AT keyboard controller.  The driver is required for the console driver
syscons(4) or vt(4).  The driver exposes its own ioctl(2) interface to allow
it to be configured from userland through the kbdcontrol(1) utility.

II.  Problem Description

Incorrect signedness comparison in the ioctl(2) handler allows a malicious
local user to overwrite a portion of the kernel memory.

III. Impact

A local user may crash the kernel, read a portion of kernel memory and
execute arbitrary code in kernel context.  The result of executing an
arbitrary kernel code is privilege escalation.

IV.  Workaround

Disallow keymap changes for non-privileged users:

sysctl hw.kbd.keymap_restrict_change=4

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-16:18/atkbd.patch
# fetch https://security.FreeBSD.org/patches/SA-16:18/atkbd.patch.asc
# gpg --verify atkbd.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/9/                                                         r300093
releng/9.3/                                                       r300088
stable/10/                                                        r300091
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/SETFKEY.html>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1886>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:18.atkbd.asc>
-----BEGIN PGP SIGNATURE-----
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=6GJy
-----END PGP SIGNATURE-----
_______________________________________________
freebsd-security-notifications@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications
To unsubscribe, send any mail to "freebsd-security-notifications-unsubscribe@freebsd.org"


Previous message sorted by date: FreeBSD Security Advisory FreeBSD-SA-16:17.openssl
Next message sorted by date: FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg
Previous message sorted by thread: FreeBSD Security Advisory FreeBSD-SA-16:17.openssl
Next message by thread: FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg
Main Index
Thread Index

CSIM home pageWMailAccount managementCSIM LibraryNetwork test toolsSearch CSIM directories
Contact us: Olivier Nicole CSIM    SET    AIT Last update: May 2016