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SuSE Linux Advisory: tcpdump/libpcap

May 29, 2002, 12:59 (1 Talkback[s])

____________________________________________________________________________

                        SuSE Security Announcement

        Package:                tcpdump/libpcap
        Announcement-ID:        SuSE-SA:2002:020
        Date:                   Wed May 29 14:00:00 MEST 2002
        Affected products:      6.4, 7.0, 7.1, 7.2, 7.3, 8.0,
                                SuSE Linux Database Server,
                                SuSE eMail Server III,
                                SuSE Firewall Adminhost VPN,
                                SuSE Linux Admin-CD for Firewall,
                                SuSE Linux Live-CD for Firewall,
                                SuSE Linux Enterprise Server for S/390,
                                SuSE Linux Connectivity Server,
                                SuSE Linux Enterprise Server 7
        Vulnerability Type:     remote command execution
        Severity (1-10):        6
        SuSE default package:   yes
        Other affected systems: All systems with vulnerable tcpdump.

    Content of this advisory:
        1) security vulnerability resolved: Buffer overflow in tcpdump.
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds
        3) standard appendix (further information)

____________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    The tcpdump program may be used to capture and decode network traffic.
    Tcpdump decodes certain packets such as AFS requests in a wrong way
    resulting in a buffer overflow. Since running tcpdump requires root
    privileges this may lead to a root compromise of the system running
    tcpdump. We strongly recommend an update for administrators using
    tcpdump to monitor their networks since the only safe workaround is to
    not use it at all.
        Additionally to the fixed tcpdump packages we provide new libpcap
    packages. Libpcap on which most network monitoring programs rely also
    contained overflows which however are only exploitable by local attackers
    if you installed programs using libpcap setuid. This is not found in a
    default install.
        More information about tcpdump and libpcap may be found at
    http://www.tcpdump.org

    Please download the update package for your distribution and verify its
    integrity by the methods listed in section 3) of this announcement.
    Then, install the package using the command "rpm -Fhv file.rpm" to apply
    the update.
    Our maintenance customers are being notified individually. The packages
    are being offered to install from the maintenance web.

    i386 Intel Platform:

    SuSE-8.0
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-300.i386.rpm
      f6b5499e4857575fa162ae24cde181c8
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/tcpdump-3.6.2-300.src.rpm
      2dd114976f858d0a66c83f409dbf25a0

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/tcpdump-3.6.2-300.i386.rpm
      dc7fba8709f74476ee463e3b7d3d9042
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/tcpdump-3.6.2-300.src.rpm
      d2d6a940df5c40e54a6b30e3698458ef

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/tcpdump-3.4a6-376.i386.rpm
      601bc08d351e8100767bbfd502efd44b
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/tcpdump-3.4a6-376.src.rpm
      af87a4ad56fc853800c6af5982899f18

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/tcpdump-3.4a6-375.i386.rpm
      a3251d65bfa05948ce3796ac9e5fdf5b
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/tcpdump-3.4a6-375.src.rpm
      84ba69db15e1ff569cf674f7d61428f1

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/tcpdump-3.4a6-374.i386.rpm
      63d57b2062a91d5fabeb43a5543d245e
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/tcpdump-3.4a6-374.src.rpm
      204195b01bc25f84209029bed0eb00cd

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/tcpdump-3.4a6-372.i386.rpm
      ebb48c115355dc4ba1f45b1f8c36f9aa
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/tcpdump-3.4a6-372.src.rpm
      d2087aea083c4f6b93a518eee00c979e


    Sparc Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/tcpdump-3.6.2-58.sparc.rpm
      bb422a4c2d025d3b8a805345a200576a
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/tcpdump-3.6.2-58.src.rpm
      e0f85bd701865ca1f3d0923d1b9eb24c

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/tcpdump-3.4a6-318.sparc.rpm
      eaf6237823690fe4cb72df39b2b75a5f
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/tcpdump-3.4a6-318.src.rpm
      458f7aaa2ed33606007d345d371bf8c4

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/tcpdump-3.4a6-318.sparc.rpm
      6137a3ecadd2bfd95b51039fef52187b
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/tcpdump-3.4a6-318.src.rpm
      0227535bdc5f7bd6980e77737cc6182c


    AXP Alpha Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/tcpdump-3.4a6-329.alpha.rpm
      614dfa16b71456692bc1d92b9db0998b
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/tcpdump-3.4a6-329.src.rpm
      e5a05bdbe3d5a29f0840c488e703268b

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/tcpdump-3.4a6-330.alpha.rpm
      0f1fbdfdcf8f4e1a90424df1b3ad05bc
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/tcpdump-3.4a6-330.src.rpm
      d48289b8926c3fa7602b6ad026ae4130

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/tcpdump-3.4a6-330.alpha.rpm
      bf9ef22920ff73802e3b02005476527b
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/tcpdump-3.4a6-330.src.rpm
      1fa595c3febfc97f45642faffdd1dfb1

    PPC Power PC Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/tcpdump-3.6.2-189.ppc.rpm
      303f6a00defddc3b8a3be1ab386021cf
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/tcpdump-3.6.2-189.src.rpm
      552355e0f15582d47d64fd3a97542cf3

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/tcpdump-3.4a6-317.ppc.rpm
      4dd468ba517be7c7f52a8b2ac7c2beb0
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/tcpdump-3.4a6-317.src.rpm
      69be109e360246794c66ed55e199ee95

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/tcpdump-3.4a6-316.ppc.rpm
      1b51e5529fa559d8453588f09d9b8585
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/tcpdump-3.4a6-316.src.rpm
      20d1da2b898a483df771809747851967

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/tcpdump-3.4a6-315.ppc.rpm
      97cd7574108f3fcb9f52a7213d626481
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/tcpdump-3.4a6-315.src.rpm
      67c63c89e26c2a17df6fef3585f41481


____________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - Perl-Digest-MD5
    The Perl Digest-MD5 module fails to handle utf8 characters properly
    and thus calculates wrong hash sums for certain input. New packages
    are already available on our ftp servers.

____________________________________________________________________________

3)  standard appendix: authenticity verification, additional information

  - Package authenticity verification:

    SuSE update packages are available on many mirror ftp servers all over
    the world. While this service is being considered valuable and important
    to the free and open source software community, many users wish to be
    sure about the origin of the package and its content before installing
    the package. There are two verification methods that can be used
    independently from each other to prove the authenticity of a downloaded
    file or rpm package:
    1) md5sums as provided in the (cryptographically signed) announcement.
    2) using the internal gpg signatures of the rpm package.

    1) execute the command
        md5sum <name-of-the-file.rpm>
       after you downloaded the file from a SuSE ftp server or its mirrors.
       Then, compare the resulting md5sum with the one that is listed in the
       announcement. Since the announcement containing the checksums is
       cryptographically signed (usually using the key security@suse.de),
       the checksums show proof of the authenticity of the package.
       We disrecommend to subscribe to security lists which cause the
       email message containing the announcement to be modified so that
       the signature does not match after transport through the mailing
       list software.
       Downsides: You must be able to verify the authenticity of the
       announcement in the first place. If RPM packages are being rebuilt
       and a new version of a package is published on the ftp server, all
       md5 sums for the files are useless.

    2) rpm package signatures provide an easy way to verify the authenticity
       of an rpm package. Use the command
        rpm -v --checksig <file.rpm>
       to verify the signature of the package, where <file.rpm> is the
       filename of the rpm package that you have downloaded. Of course,
       package authenticity verification can only target an uninstalled rpm
       package file.
       Prerequisites:
        a) gpg is installed
        b) The package is signed using a certain key. The public part of this
           key must be installed by the gpg program in the directory
           ~/.gnupg/ under the user's home directory who performs the
           signature verification (usually root). You can import the key
           that is used by SuSE in rpm packages for SuSE Linux by saving
           this announcement to a file ("announcement.txt") and
           running the command (do "su -" to be root):
            gpg --batch; gpg < announcement.txt | gpg --import
           SuSE Linux distributions version 7.1 and thereafter install the
           key "build@suse.de" upon installation or upgrade, provided that
           the package gpg is installed. The file containing the public key
           is placed at the toplevel directory of the first CD (pubring.gpg)
           and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de

 - SuSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
                <suse-security-subscribe@suse.com>.

    suse-security-announce@suse.com
        -   SuSE's announce-only mailing list.
            Only SuSE's security annoucements are sent to this list.
            To subscribe, send an email to
                <suse-security-announce-subscribe@suse.com>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <suse-security-info@suse.com> or
        <suse-security-faq@suse.com> respectively.

    =====================================================================
    SuSE's security contact is <security@suse.com> or <security@suse.de>.
    The <security@suse.de> public key is listed below.
    =====================================================================
____________________________________________________________________________

    The information in this advisory may be distributed or reproduced,
    provided that the advisory is not modified in any way. In particular,
    it is desired that the cleartext signature shows proof of the
    authenticity of the text.
    SuSE Linux AG makes no warranties of any kind whatsoever with respect
    to the information contained in this security advisory.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>