3571e53040
patches for easier mirroring, to eliminate a special copy, to make www.freebsd.org/security a full copy of security.freebsd.org and be eventually be the same. For now files are just sitting there. The symlinks are missing. Discussed on: www (repository location) Discussed with: simon (so)
135 lines
5.2 KiB
Text
135 lines
5.2 KiB
Text
-----BEGIN PGP SIGNED MESSAGE-----
|
|
Hash: SHA1
|
|
|
|
=============================================================================
|
|
FreeBSD-SA-06:25.kmem Security Advisory
|
|
The FreeBSD Project
|
|
|
|
Topic: Kernel memory disclosure in firewire(4)
|
|
|
|
Category: core
|
|
Module: sys_dev
|
|
Announced: 2006-12-06
|
|
Credits: Rodrigo Rubira Branco
|
|
Affects: All FreeBSD releases.
|
|
Corrected: 2006-12-06 09:13:51 UTC (RELENG_6, 6.2-STABLE)
|
|
2006-12-06 09:14:23 UTC (RELENG_6_2, 6.2-RC2)
|
|
2006-12-06 09:14:59 UTC (RELENG_6_1, 6.1-RELEASE-p11)
|
|
2006-12-06 09:15:40 UTC (RELENG_6_0, 6.0-RELEASE-p16)
|
|
2006-12-06 09:16:17 UTC (RELENG_5, 5.5-STABLE)
|
|
2006-12-06 09:16:41 UTC (RELENG_5_5, 5.5-RELEASE-p9)
|
|
2006-12-06 09:17:09 UTC (RELENG_4, 4.11-STABLE)
|
|
2006-12-06 09:18:02 UTC (RELENG_4_11, 4.11-RELEASE-p26)
|
|
CVE Name: CVE-2006-6013
|
|
|
|
For general information regarding FreeBSD Security Advisories,
|
|
including descriptions of the fields above, security branches, and the
|
|
following sections, please visit <URL:http://security.FreeBSD.org/>.
|
|
|
|
I. Background
|
|
|
|
The firewire(4) driver provides support for IEEE 1394 ("FireWire")
|
|
interfaces. This driver provides some of its functionality via the
|
|
ioctl(2) system call.
|
|
|
|
II. Problem Description
|
|
|
|
In the FW_GCROM ioctl, a signed integer comparison is used instead of
|
|
an unsigned integer comparison when computing the length of a buffer
|
|
to be copied from the kernel into the calling application.
|
|
|
|
III. Impact
|
|
|
|
A user in the "operator" group can read the contents of kernel memory.
|
|
Such memory might contain sensitive information, such as portions of
|
|
the file cache or terminal buffers. This information might be directly
|
|
useful, or it might be leveraged to obtain elevated privileges in some
|
|
way; for example, a terminal buffer might include a user-entered
|
|
password.
|
|
|
|
IV. Workaround
|
|
|
|
No workaround is available, but systems without IEEE 1394 ("FireWire")
|
|
interfaces are not vulnerable. (Note that systems with IEEE 1394
|
|
interfaces are affected regardless of whether any devices are attached.)
|
|
|
|
Note also that FreeBSD does not have any non-root users in the "operator"
|
|
group by default; systems on which no users have been added to this group
|
|
are therefore also not vulnerable.
|
|
|
|
V. Solution
|
|
|
|
Perform one of the following:
|
|
|
|
1) Upgrade your vulnerable system to 4-STABLE, 5-STABLE, or 6-STABLE,
|
|
or to the RELENG_6_1, RELENG_6_0, RELENG_5_5, or RELENG_4_11 security
|
|
branch dated after the correction date.
|
|
|
|
2) To patch your present system:
|
|
|
|
The following patches have been verified to apply to FreeBSD 4.11, 5.5,
|
|
6.0, and 6.1 systems.
|
|
|
|
a) Download the relevant patch from the location below, and verify the
|
|
detached PGP signature using your PGP utility.
|
|
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:25/kmem.patch
|
|
# fetch http://security.FreeBSD.org/patches/SA-06:25/kmem.patch.asc
|
|
|
|
b) Apply the patch.
|
|
|
|
# cd /usr/src
|
|
# patch < /path/to/patch
|
|
|
|
c) Recompile your kernel as described in
|
|
<URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
|
|
system.
|
|
|
|
VI. Correction details
|
|
|
|
The following list contains the revision numbers of each file that was
|
|
corrected in FreeBSD.
|
|
|
|
Branch Revision
|
|
Path
|
|
- -------------------------------------------------------------------------
|
|
RELENG_4
|
|
src/sys/dev/firewire/fwdev.c 1.2.4.17
|
|
RELENG_4_11
|
|
src/UPDATING 1.73.2.91.2.27
|
|
src/sys/conf/newvers.sh 1.44.2.39.2.30
|
|
src/sys/dev/firewire/fwdev.c 1.2.4.16.4.1
|
|
RELENG_5
|
|
src/sys/dev/firewire/fwdev.c 1.44.2.2
|
|
RELENG_5_5
|
|
src/UPDATING 1.342.2.35.2.9
|
|
src/sys/conf/newvers.sh 1.62.2.21.2.11
|
|
src/sys/dev/firewire/fwdev.c 1.44.2.1.4.1
|
|
RELENG_6
|
|
src/sys/dev/firewire/fwdev.c 1.46.2.2
|
|
RELENG_6_2
|
|
src/UPDATING 1.416.2.29.2.1
|
|
src/sys/dev/firewire/fwdev.c 1.46.2.1.6.1
|
|
RELENG_6_1
|
|
src/UPDATING 1.416.2.22.2.13
|
|
src/sys/conf/newvers.sh 1.69.2.11.2.13
|
|
src/sys/dev/firewire/fwdev.c 1.46.2.1.4.1
|
|
RELENG_6_0
|
|
src/UPDATING 1.416.2.3.2.21
|
|
src/sys/conf/newvers.sh 1.69.2.8.2.17
|
|
src/sys/dev/firewire/fwdev.c 1.46.2.1.2.1
|
|
- -------------------------------------------------------------------------
|
|
|
|
VII. References
|
|
|
|
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6013
|
|
|
|
The latest revision of this advisory is available at
|
|
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:25.kmem.asc
|
|
-----BEGIN PGP SIGNATURE-----
|
|
Version: GnuPG v1.4.3 (FreeBSD)
|
|
|
|
iD8DBQFFdo1QFdaIBMps37IRAj4vAJ4vzhNk4MBkhAxsmeIAA0UgnXXOwACfY+Oe
|
|
WhWIJLjTgqq+T3ZpySyRCNo=
|
|
=FbZj
|
|
-----END PGP SIGNATURE-----
|