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FreeBSD-SA-05:06.iir                                        Security Advisory
                                                          The FreeBSD Project

Topic:          Incorrect permissions on /dev/iir

Category:       core
Module:         sys_dev
Announced:      2005-05-06
Credits:        Christian S.J. Peron
                Andre Guibert de Bruet
Affects:        All FreeBSD 4.x releases since 4.6-RELEASE
                All FreeBSD 5.x releases prior to 5.4-RELEASE
Corrected:      2005-05-06 02:33:46 UTC (RELENG_5, 5.4-STABLE)
                2005-05-06 02:34:18 UTC (RELENG_5_4, 5.4-RELEASE)
                2005-05-06 02:34:01 UTC (RELENG_5_3, 5.3-RELEASE-p11)
                2005-05-06 02:32:54 UTC (RELENG_4, 4.11-STABLE)
                2005-05-06 02:33:28 UTC (RELENG_4_11, 4.11-RELEASE-p5)
                2005-05-06 02:33:12 UTC (RELENG_4_10, 4.10-RELEASE-p10)
CVE Name:       CAN-2005-1399

For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>.

0.   Revision History

v1.0 2005-05-06  Initial release.
v1.1 2005-05-07  Updated credits to include Andre Guibert de Bruet, who
                 was inadvertantly omitted from the original advisory.

I.   Background

The iir(4) driver provides support for the Intel Integrated RAID controllers and ICP Vortex RAID controllers.

II.  Problem Description

The default permissions on the /dev/iir device node allow unprivileged local users to open the device and execute ioctl calls.

III. Impact

Unprivileged local users can send commands to the hardware supported by the iir(4) driver, allowing destruction of data and possible disclosure of data.

IV.  Workaround

Systems without hardware supported by the iir(4) driver are not affected by this issue.  On systems which are affected, as a workaround, the permissions on /dev/iir can be changed manually.

As root, execute the following command:

# chmod 0600 /dev/iir*

On 5.x, the following commands are also needed to ensure that the correct permissions are used after rebooting.

# echo 'perm iir* 0600' >> /etc/devfs.conf # echo 'devfs_enable="YES"' >> /etc/rc.conf

If the administrator has created additional device nodes, or mounted additional instances of devfs(5) elsewhere in the file system name space, attention should be paid to ensure that either the iir device node is not visible in those name spaces, or is similarly protected.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 4-STABLE or 5-STABLE, or to the RELENG_5_3, RELENG_4_11, or RELENG_4_10 security branch dated after the correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 4.10, 4.11, and 5.3 systems.

a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.

# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:06/iir.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:06/iir.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/iir/iir_ctrl.c                                      1.2.2.5
RELENG_4_11
  src/UPDATING                                              1.73.2.91.2.6
  src/sys/conf/newvers.sh                                   1.44.2.39.2.9
  src/sys/dev/iir/iir_ctrl.c                                 1.2.2.4.12.1
RELENG_4_10
  src/UPDATING                                             1.73.2.90.2.11
  src/sys/conf/newvers.sh                                  1.44.2.34.2.12
  src/sys/dev/iir/iir_ctrl.c                                 1.2.2.4.10.1
RELENG_5
  src/sys/dev/iir/iir_ctrl.c                                     1.15.2.2
RELENG_5_4
  src/UPDATING                                             1.342.2.24.2.5
  src/sys/dev/iir/iir_ctrl.c                                 1.15.2.1.2.1
RELENG_5_3
  src/UPDATING                                            1.342.2.13.2.14
  src/sys/conf/newvers.sh                                  1.62.2.15.2.16
  src/sys/dev/iir/iir_ctrl.c                                     1.15.4.1
- -------------------------------------------------------------------------

The latest revision of this advisory is available at ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:06.iir.asc
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