FreeBSD Security Advisory FreeBSD-SA-05:10.tcpdump

From: FreeBSD Security Advisories (security-advisories_at_freebsd.org)
Date: 06/09/05

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    =============================================================================
    FreeBSD-SA-05:10.tcpdump Security Advisory
                                                              The FreeBSD Project

    Topic: Infinite loops in tcpdump protocol decoding

    Category: contrib
    Module: tcpdump
    Announced: 2005-06-09
    Credits: "Vade 79", Simon L. Nielsen
    Affects: FreeBSD 5.3-RELEASE and FreeBSD 5.4-RELEASE
    Corrected: 2005-06-08 21:26:27 UTC (RELENG_5, 5.4-STABLE)
                    2005-06-08 21:27:44 UTC (RELENG_5_4, 5.4-RELEASE-p2)
                    2005-06-08 21:29:15 UTC (RELENG_5_3, 5.3-RELEASE-p16)
    CVE Name: CAN-2005-1267, CAN-2005-1278, CAN-2005-1279, CAN-2005-1280

    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 tcpdump utility is used to capture and examine network traffic.

    II. Problem Description

    Several tcpdump protocol decoders contain programming errors which can
    cause them to go into infinite loops.

    III. Impact

    An attacker can inject specially crafted packets into the network
    which, when processed by tcpdump, could lead to a denial-of-service.
    After the attack, tcpdump would no longer capture traffic, and would
    potentially use all available processor time.

    IV. Workaround

    No workaround is available.

    V. Solution

    Perform one of the following:

    1) Upgrade your vulnerable system to 5-STABLE, or to the RELENG_5_4
    or RELENG_5_3 security branch dated after the correction date.

    2) To patch your present system:

    The following patches have been verified to apply to FreeBSD 5.3 and
    5.4 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-05:10/tcpdump.patch
    # fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-05:10/tcpdump.patch.asc

    b) Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch
    # cd /usr/src/usr.sbin/tcpdump/tcpdump
    # make obj && make depend && make && make install

    VI. Correction details

    The following list contains the revision numbers of each file that was
    corrected in FreeBSD.

    Branch Revision
      Path
    - -------------------------------------------------------------------------
    RELENG_5
      src/contrib/tcpdump/print-bgp.c 1.1.1.5.2.1
      src/contrib/tcpdump/print-isoclns.c 1.12.2.1
      src/contrib/tcpdump/print-ldp.c 1.1.1.1.2.1
      src/contrib/tcpdump/print-rsvp.c 1.1.1.1.2.1
    RELENG_5_4
      src/UPDATING 1.342.2.24.2.11
      src/sys/conf/newvers.sh 1.62.2.18.2.7
      src/contrib/tcpdump/print-bgp.c 1.1.1.5.6.1
      src/contrib/tcpdump/print-isoclns.c 1.12.6.1
      src/contrib/tcpdump/print-ldp.c 1.1.1.1.6.1
      src/contrib/tcpdump/print-rsvp.c 1.1.1.1.6.1
    RELENG_5_3
      src/UPDATING 1.342.2.13.2.19
      src/sys/conf/newvers.sh 1.62.2.15.2.21
      src/contrib/tcpdump/print-bgp.c 1.1.1.5.4.1
      src/contrib/tcpdump/print-isoclns.c 1.12.4.1
      src/contrib/tcpdump/print-ldp.c 1.1.1.1.4.1
      src/contrib/tcpdump/print-rsvp.c 1.1.1.1.4.1
    - -------------------------------------------------------------------------

    VII. References

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1267
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1278
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1279
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1280
    http://marc.theaimsgroup.com/?l=bugtraq&m=111454406222040
    http://marc.theaimsgroup.com/?l=bugtraq&m=111454461300644

    The latest revision of this advisory is available at
    ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-05:10.tcpdump.asc
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