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SuSE Security Announcement: tcpdump (SuSE-SA:2003:0015)
From: Thomas Biege <thomas () suse de>
Date: Thu, 13 Mar 2003 16:48:49 +0100 (CET)

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                tcpdump
        Announcement-ID:        SuSE-SA:2003:0015
        Date:                   Thursday, Mar 13th 2003 16:10 MET
        Affected products:      7.3, 8.0, 8.1
                                SuSE Linux Database Server
                                SuSE eMail Server 3.1
                                SuSE eMail Server III
                                SuSE Firewall Adminhost VPN
                                SuSE Linux Admin-CD for Firewall
                                SuSE Firewall on CD 2 - VPN
                                SuSE Firewall on CD 2
                                SuSE Linux Live-CD for Firewall
                                SuSE Linux Connectivity Server
                                SuSE Linux Enterprise Server 7 for S/390 and zSeries
                                SuSE Linux Enterprise Server 8
                                SuSE Linux Office Server
        Vulnerability Type:     remote system compromise
        Severity (1-10):        4
        SuSE default package:   yes
        Cross References:       CAN-2003-0108

    Content of this advisory:
        1) security vulnerability resolved:
            - denial-of-service condition while parsing ISAKMP or BGP packets
            - possible remote code execution while handling NFS packets
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - ethereal
            - qpopper
            - XFree4
            - sendmail
            - apcupsd
            - snort
            - file
            - zlib
            - vnc
        3) standard appendix (further information)

______________________________________________________________________________

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

    The network traffic analyzer tool tcpdump is vulnerable to a denial-of-
    service condition while parsing ISAKMP or BGP packets. This bug can
    be exploited remotely by an attacker to stop the use of tcpdump for
    analyzing network traffic for signs of security breaches or alike.
    Another bug may lead to system compromise due to the handling of
    malformed NFS packets send by an attacker.
    Please note, that tcpdump drops root privileges right after allocating
    the needed raw sockets.

    There is no temporary fix known.

    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.



    Intel i386 Platform:

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/tcpdump-3.7.1-198.i586.rpm
      524015d3f9517311ee46eb63bc3ed42f
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/tcpdump-3.7.1-198.i586.patch.rpm
      2e1d2db971cf2693e5acca0da7e3bb39
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/tcpdump-3.7.1-198.src.rpm
      12da6755830e7614e8f81a204c546cbf

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-322.i386.rpm
      069db7de9a137b050f38c6f6a3398266
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/tcpdump-3.6.2-322.i386.patch.rpm
      3dcb00b25d35d275e2e70eba2c96fa26
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/tcpdump-3.6.2-322.src.rpm
      0ed4e0db7d71f5a518173193f8a9b057

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/tcpdump-3.6.2-321.i386.rpm
      22b2a243e3a2fbbb0288d76da5a2bccc
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/tcpdump-3.6.2-321.src.rpm
      d50729c39c29566371c7d708be782d43

    SuSE-7.2:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/tcpdump-3.4a6-376.i386.rpm
      601bc08d351e8100767bbfd502efd44b
    source rpm(s):
    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(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/tcpdump-3.4a6-375.src.rpm
      84ba69db15e1ff569cf674f7d61428f1



    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/tcpdump-3.6.2-65.sparc.rpm
      7f75bdd0c9456fe437647030bb52d92d
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/tcpdump-3.6.2-65.src.rpm
      4b3049a5048e5904a69d16b028220f42




    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(s):
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/tcpdump-3.4a6-329.src.rpm
      e5a05bdbe3d5a29f0840c488e703268b



    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/tcpdump-3.6.2-207.ppc.rpm
      fef9a77ba86c06d661c34646a8101b8a
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/tcpdump-3.6.2-207.src.rpm
      9c800d4fc891a30a4a880b55979ffe3a

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

______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - ethereal
      A format string bug in ethereal's SOCKS handling code and a buffer
      overflow in the NTLMSSP was found in ethereal. Both bugs may lead
      to remote system compromise.
      New packages are currently being build and will be available soon.

    - qpopper
      In version 4.0.x of qpopper a buffer overflow *after* user authen-
      tication can be exploited to gain a shell on a POP-server machine.
      New packages are currently being build and will be available soon.

    - XFree4
      A buffer overflow in the Xlib code can be triggered while handling
      the environment variable XLOCALEDIR. The X version affected is 4.2.0
      (SuSE Linux 8.0 and 8.1).
      We still investigate this issue.

    - sendmail
      A correction is necessary to the last SuSE Security Announcement
      (SuSE-SA:2003:013) about sendmail: The Vulnerability Type must read
      remote buffer overflow.

    - apcupsd
      The control and management daemon for APC UPS systems is vulnerable
      to remote code execution due to buffer overflow and format string bugs.
      A dedicated advisory for this issue will be released as soon as all
      packages are build.

    - snort
      snort, a sensor-based Network Intrusion Detection System, was
      vulnerable to a buffer overflow in it's RPC preprocessor.
      As a workaround the following line in snort.conf should be commented
      out and snort should be restarted to disable the RPC-preprocessor:
        preprocessor rpc_decode: 111 32771
      Future version of SuSE Linux will be shipped with a fixed snort
      package.

    - file
      A locally exploitable buffer overflow was found in the file command.
      New packages are currently being build and will be available soon.

    - zlib
      zlib's function gzprintf() is prone to a buffer overflow if its
      arguments expand to more then Z_PRINTF_BUFSIZE bytes.
      A fixed version of zlib will be shipped with future SuSE Linux
      versions.

    - vnc
      VNC (Virtual Network Computing) uses a weak cookie generation process
      which can be exploited by an attacker to bypass authentication.
      New packages are currently being tested and will be available on our
      FTP servers soon.

______________________________________________________________________________

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 un-installed 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 top-level 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 announcements 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 clear-text 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>

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Bye,
     Thomas
-- 
  Thomas Biege <thomas () suse de>
  SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg
  Function: Security Support & Auditing
  "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | gpg --import"
  Key fingerprint = 7254 B15D B3C4 943F 485E  0BBD 8ECC D7CB C200 A213

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