FreeBSD Security Advisory FreeBSD-SA-05:08.kmem [REVISED]

From: FreeBSD Security Advisories (security-advisories_at_freebsd.org)
Date: 05/09/05

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    =============================================================================
    FreeBSD-SA-05:08.kmem Security Advisory
                                                              The FreeBSD Project

    Topic: Local kernel memory disclosure

    Category: core
    Module: sys
    Announced: 2005-05-06
    Credits: Christian S.J. Peron
                    Uwe Doering
    Affects: All FreeBSD releases prior to 5.4-RELEASE
    Corrected: 2005-05-08 10:19:37 UTC (RELENG_5, 5.4-STABLE)
                    2005-05-07 03:58:26 UTC (RELENG_5_4, 5.4-RELEASE)
                    2005-05-08 10:23:52 UTC (RELENG_5_3, 5.3-RELEASE-p14)
                    2005-05-08 10:26:42 UTC (RELENG_4, 4.11-STABLE)
                    2005-05-08 10:29:54 UTC (RELENG_4_11, 4.11-RELEASE-p8)
                    2005-05-08 10:35:56 UTC (RELENG_4_10, 4.10-RELEASE-p13)
    CVE Name: CAN-2005-1406

    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 patch to include related issues reported by
                     Uwe Doering.

    I. Background

    In many parts of the FreeBSD kernel, names (of mount points, devices,
    files, etc.) are manipulated as NULL-terminated strings, but are provided
    to applications within fixed-length buffers.

    II. Problem Description

    In several places, variable-length strings were copied into fixed-length
    buffers without zeroing the unused portion of the buffer.

    III. Impact

    The previous contents of part of the fixed-length buffers will be
    disclosed to applications. 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.

    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.

    [FreeBSD 4.x]
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem4x.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem4x.patch.asc

    [FreeBSD 5.x]
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem5x.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:08/kmem5x.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/kern/uipc_usrreq.c 1.54.2.11
      src/sys/kern/vfs_subr.c 1.249.2.32
      src/sys/net/if_mib.c 1.8.2.3
      src/sys/netinet/ip_divert.c 1.42.2.8
      src/sys/netinet/raw_ip.c 1.64.2.20
      src/sys/netinet/tcp_subr.c 1.73.2.34
      src/sys/netinet/udp_usrreq.c 1.64.2.20
    RELENG_4_11
      src/UPDATING 1.72.2.91.2.9
      src/sys/conf/newvers.sh 1.44.2.39.2.12
      src/sys/kern/uipc_usrreq.c 1.54.2.10.8.1
      src/sys/kern/vfs_subr.c 1.249.2.31.6.1
      src/sys/net/if_mib.c 1.8.2.2.2.1
      src/sys/netinet/ip_divert.c 1.42.2.7.2.1
      src/sys/netinet/raw_ip.c 1.64.2.19.2.1
      src/sys/netinet/tcp_subr.c 1.73.2.33.4.1
      src/sys/netinet/udp_usrreq.c 1.64.2.19.6.1
    RELENG_4_10
      src/UPDATING 1.73.2.90.2.14
      src/sys/conf/newvers.sh 1.44.2.34.2.15
      src/sys/kern/uipc_usrreq.c 1.54.2.10.6.1
      src/sys/kern/vfs_subr.c 1.249.2.31.4.1
      src/sys/net/if_mib.c 1.8.2.1.16.2
      src/sys/netinet/ip_divert.c 1.42.2.6.6.1
      src/sys/netinet/raw_ip.c 1.64.2.18.4.1
      src/sys/netinet/tcp_subr.c 1.73.2.33.2.1
      src/sys/netinet/udp_usrreq.c 1.64.2.19.4.1
    RELENG_5
      src/sys/kern/subr_bus.c 1.156.2.7
      src/sys/kern/uipc_usrreq.c 1.138.2.14
      src/sys/kern/vfs_subr.c 1.522.2.5
      src/sys/net/if_mib.c 1.13.4.2
      src/sys/netinet/ip_divert.c 1.98.2.3
      src/sys/netinet/raw_ip.c 1.142.2.5
      src/sys/netinet/tcp_subr.c 1.201.2.18
      src/sys/netinet/udp_usrreq.c 1.162.2.8
    RELENG_5_4
      src/UPDATING 1.342.2.24.2.9
      src/sys/kern/subr_bus.c 1.156.2.5.2.1
      src/sys/kern/uipc_usrreq.c 1.138.2.13.2.1
      src/sys/kern/vfs_subr.c 1.522.2.4.2.1
      src/sys/net/if_mib.c 1.13.4.1.2.1
      src/sys/netinet/ip_divert.c 1.98.2.2.2.1
      src/sys/netinet/raw_ip.c 1.142.2.4.2.1
      src/sys/netinet/tcp_subr.c 1.201.2.15.2.1
      src/sys/netinet/udp_usrreq.c 1.162.2.7.2.1
    RELENG_5_3
      src/UPDATING 1.342.2.13.2.17
      src/sys/conf/newvers.sh 1.62.2.15.2.19
      src/sys/kern/subr_bus.c 1.156.2.2.2.1
      src/sys/kern/uipc_usrreq.c 1.138.2.2.2.2
      src/sys/kern/vfs_subr.c 1.522.2.1.2.1
      src/sys/net/if_mib.c 1.13.6.1
      src/sys/netinet/ip_divert.c 1.98.4.1
      src/sys/netinet/raw_ip.c 1.142.2.2.2.1
      src/sys/netinet/tcp_subr.c 1.201.2.1.2.2
      src/sys/netinet/udp_usrreq.c 1.162.2.3.2.1
    - -------------------------------------------------------------------------

    The latest revision of this advisory is available at
    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:08.kmem.asc
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