132 lines
4.6 KiB
Text
132 lines
4.6 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
Hash: SHA512
|
|
|
|
=============================================================================
|
|
FreeBSD-EN-15:01.vt Errata Notice
|
|
The FreeBSD Project
|
|
|
|
Topic: vt(4) crash with improper ioctl parameters
|
|
|
|
Category: core
|
|
Module: vt
|
|
Announced: 2015-02-25
|
|
Credits: Francisco Falcon from Core Security Technologies
|
|
Affects: FreeBSD 9.3 and FreeBSD 10.1
|
|
Corrected: 2015-02-02 18:48:49 UTC (stable/10, 10.1-STABLE)
|
|
2015-02-25 05:56:16 UTC (releng/10.1, 10.1-RELEASE-p6)
|
|
2015-02-02 18:48:49 UTC (stable/9, 9.3-STABLE)
|
|
2015-02-25 05:56:54 UTC (releng/9.3, 9.3-RELEASE-p10)
|
|
|
|
For general information regarding FreeBSD Errata Notices and Security
|
|
Advisories, including descriptions of the fields above, security
|
|
branches, and the following sections, please visit
|
|
<URL:https://security.freebsd.org/>.
|
|
|
|
I. Background
|
|
|
|
The vt(4) device provides multiple virtual terminals with an extensive
|
|
feature set.
|
|
|
|
II. Problem Description
|
|
|
|
The vt(4) code uses a signed integer as index value and does not test for
|
|
negative values.
|
|
|
|
III. Impact
|
|
|
|
A local attacker could trigger a panic by tricking the kernel into
|
|
accessing undefined kernel memory.
|
|
|
|
IV. Workaround
|
|
|
|
No workaround is available, but systems that do not use vt(4) are not
|
|
affected.
|
|
|
|
All affected FreeBSD releases does not ship with vt(4) enabled by
|
|
default, and user have to enable them explicitly.
|
|
|
|
V. Solution
|
|
|
|
Perform one of the following:
|
|
|
|
1) Upgrade your system to a supported FreeBSD stable or release / security
|
|
branch (releng) dated after the correction date.
|
|
|
|
2) To update your present 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
|
|
|
|
3) To update your present 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/EN-15:01/vt.patch
|
|
# fetch https://security.FreeBSD.org/patches/EN-15:01/vt.patch.asc
|
|
# gpg --verify vt.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/ r278106
|
|
releng/9.3/ r279265
|
|
stable/10/ r278106
|
|
releng/10.1/ r279264
|
|
- -------------------------------------------------------------------------
|
|
|
|
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-2014-0998>
|
|
|
|
<URL:http://www.coresecurity.com/advisories/freebsd-kernel-multiple-vulnerabilities>
|
|
|
|
The latest revision of this Errata Notice is available at
|
|
https://security.FreeBSD.org/advisories/FreeBSD-EN-15:01.vt.asc
|
|
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v2.1.1 (FreeBSD)
|
|
|
|
iQIcBAEBCgAGBQJU7Wi8AAoJEO1n7NZdz2rnjXUQAIXWVC52AmDrQHvirZ23Jc84
|
|
OnhLpYU3McHxtEpuIRZOcklDwuBQlP/0u1zsHoPvlHP/t6k74SA07MsuYjnUYrom
|
|
lF+P9wlmADXXFijGceE3UvdxD574ByyOVuqwvjDMbnxJOCyUNM4NaflZCacpqt4J
|
|
P7cpZVBLIh/lmFZYuuyYZ+AKC+02hNGQkLfY010EmPjsZMPYgr6UfRP5UG3+JLvy
|
|
LXYXOMkklQst9tSyJoC1QhQ8N6MbvGAjs0f9tO2G3nLkxdSZfAWnIExkACUnhW5G
|
|
2JzBJXTrXbyRelX3RmCV93j/9PHkS5Oj85p3fmc8swsdEgyq3e2rVMUdWEtJEZuE
|
|
c5lR/cGikMpFlsFnJqNi8LyIoXiGuVfLlhsNZsfjOn4WzenYd5gbmzZFLiu5agfq
|
|
TZZOAtpoYv7yvW+t98yZR+wUDQNk0Jsq738FR8qnPG4uN0yFVMjg+EEWMIEA+fnj
|
|
rLPxCO798PkpsVgUY+KC02Q/OLDcavWmf4+dGLGXVOHGrdmW4/9mSywiQQEZXl/9
|
|
5GsY/5Qy6XmL8bf+I7pa1ozUGvJNZo+GZaak5hnaaaWiAt/aTlf9uoeNCizGo7ad
|
|
+srCLTEI0lEo883PrgNE8K1WWbg/by9Nv9YkE9AkPaAt8gIj/sOMuRv5/oGUj94D
|
|
v5gabABppiNMM9tNykM9
|
|
=7HYa
|
|
-----END PGP SIGNATURE-----
|