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SuSE Linux Advisory: samba, samba-client

Mar 19, 2003, 14:22 (0 Talkback[s])

____________________________________________________________________________

                        SuSE Security Announcement

        Package:                samba, samba-client
        Announcement-ID:        SuSE-SA:2003:015
        Date:                   Wednesday, March 19th 12:00 MET
        Affected products:      7.1, 7.2, 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 Enterprise Server for S/390
                                SuSE Linux Connectivity Server
                                SuSE Linux Enterprise Server 7
                                SuSE Linux Enterprise Server 8
                                SuSE Linux Office Server
        Vulnerability Type:     remote command execution
        Severity (1-10):        7
        SuSE default package:   No
        Cross References:       http://www.samba.org
                                CAN-2003-0085
                                CAN-2003-0086

    Content of this advisory:
        1) security vulnerability resolved: buffer overflows and a chown
           race condition in the smbd server, buffer overflow in the samba
           client
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - wget
        3) standard appendix (further information)

____________________________________________________________________________

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


    Sebastian Krahmer, SuSE Security Team, reviewed security-critical
    parts of the Samba server within the scope of security audits that
    the SuSE Security Team conducts on a regular basis for security-critical
    Open Source Software.
    Buffer overflows and a chown race condition have been discovered and
    fixed during the security audit. The buffer overflow vulnerabilitiy
    allows a remote attacker to execute arbitrary commands as root on the
    system running samba. In addition to the flaws fixed in the samba
    server, some overflow conditions in the samba-client package have
    been fixed with the available update packages. It is strongly
    recommended to install the update packages on a system where the
    samba package is used.

    There exists no temporary workaround against this vulnerability other
    than shutting down the smbd daemon.

    We would like to thank the Samba Team, especially Jeremy Allison, Andrew
    Bartlett and Volker Lendecke for their quick response and cooperation.

    Please note that the package names for SuSE products vary for different
    products. There exist the following pairings:
        server              client
       ----------------------------
        samba               smbclnt
        samba               samba-client
        samba-classic       samba-classic-client
        samba-ldap          samba-ldap-client

    To find out which packages are installed on your system, you may run
    the following command:

      rpm -qa|egrep '(samba|smbclnt)'

    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.

    SPECIAL INSTALL INSTRUCTIONS:
    ==============================
    After successfully installing the update packages, you should restart
    the samba server process(es) to make the changes in the system effective.
    If you do not have a samba server running on your system, no further
    action is required. If you have a samba server running, please run the
    following command as root:

      rcsmb restart


    Intel i386 Platform:

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-160.i586.rpm
      deae19fe6dc1fd519c9219e791983128
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-160.i586.rpm
      dac659a9c774ed1e0f8cea04e5b287ee
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-160.i586.patch.rpm
      1fdedee145fd35ad30ef078182bfcdeb
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-160.i586.patch.rpm
      7bf4707c05c477db610f2a79b48b51a5
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/samba-2.2.5-160.src.rpm
      f62e0b9ffb00058ec4be67746903a4cc

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-169.i386.rpm
      519550b7d4a52f63ca858f1f58c283aa
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-169.i386.rpm
      daeb00edf26acfcbad92bae602689d42
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-169.i386.patch.rpm
      faf4c352d880b1f1be4baa3e8079243f
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-169.i386.patch.rpm
      7bbcc81d79bebff8103c37f8cb8565dc
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/samba-2.2.3a-169.src.rpm
      daf838ccb337ca0863c65a9439e7ef7a

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/samba-2.2.1a-213.i386.rpm
      368e2d0190b4520965a79bf836eaaa2d
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/samba-client-2.2.1a-213.i386.rpm
      06070925fd5cb40bc3f2985a5d64eff1
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/samba-2.2.1a-213.src.rpm
      af94d5ba0977e69de416fef54980a04d

    SuSE-7.2:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/samba-2.2.0a-48.i386.rpm
      6300d1278311145e69522d58bde5aaf8
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/smbclnt-2.2.0a-48.i386.rpm
      2553481e90b85a616c25580eb2875ea4
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/samba-2.2.0a-48.src.rpm
      0d7397de281f100163fa105c972b387d

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/samba-2.0.10-27.i386.rpm
      1eb26f1ef80681ec479a9028d51647bf
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/smbclnt-2.0.10-27.i386.rpm
      fa2a4d306536dd90a31677487996f2e0
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/samba-2.0.10-27.src.rpm
      1cd317f5749de96e432fee19310ea6f6



    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/samba-2.2.1a-73.sparc.rpm
      9e140d7fe66015dfbb7f9b9edce5f91e
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/samba-client-2.2.1a-73.sparc.rpm
      632d72c89565cc90be8e02b50d3cdb9a
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/samba-2.2.1a-73.src.rpm
      eea5157ce34ff8cb959ed46c144dd96f




    AXP Alpha Platform:

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/samba-2.0.10-21.alpha.rpm
      046c7de92587d7a1c30d915b72e176bc
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/smbclnt-2.0.10-21.alpha.rpm
      12e9b05050a1610ba03f5338c6f92b82
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/samba-2.0.10-21.src.rpm
      79359cbca70ec1fb8a425e5b9a7eb00c



    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/samba-2.2.1a-147.ppc.rpm
      bd367591e2df9061baa618d6a78c84b1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/samba-client-2.2.1a-147.ppc.rpm
      b05f69057a35abde3e2c19aa456f8467
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/samba-2.2.1a-147.src.rpm
      d990a6b247a6a38eaaeaef06f71269ea

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/samba-2.0.10-21.ppc.rpm
      5dc1f1d9337a5241cb35e7179e8fb28b
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/smbclnt-2.0.10-21.ppc.rpm
      76263c619a4d05ef4f4de4f9813a0a72
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/samba-2.0.10-21.src.rpm
      be112406b4fff2b5e4a08a67a2411919


____________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - wget
    New wget packages are available which filter certain characters
    such as .. and / in filenames to ensure evil servers cannot overwrite
    important system-files or files outside the current directory.


____________________________________________________________________________

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.

   E@mail: marc@suse.de  Function: Security Research and Advisory
  PGP: "lynx -source http://www.suse.de/~marc/marc.pgp | pgp -fka"
 Key fingerprint = B5 07 B6 4E 9C EF 27 EE  16 D9 70 D4 87 B5 63 6C
Private: http://www.suse.de/~marc  SuSE: http://www.suse.de/security