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

From: FreeBSD Security Advisories (security-advisories_at_freebsd.org)
Date: 05/06/05

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    Date: Fri, 6 May 2005 03:02:58 GMT
To: FreeBSD Security Advisories <security-advisories@freebsd.org>

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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
    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/>.

    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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