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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:

    Content of this advisory:
        1) security vulnerability resolved: buffer overflows and a chown
           race condition in the smbd server, buffer overflow in the samba
           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.

    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:

    patch rpm(s):
    source rpm(s):

    patch rpm(s):
    source rpm(s):

    source rpm(s):

    source rpm(s):

    source rpm(s):

    Sparc Platform:

    source rpm(s):

    AXP Alpha Platform:

    source rpm(s):

    PPC Power PC Platform:

    source rpm(s):

    source rpm(s):


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,
       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.
        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 "" 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 .

  - SuSE runs two security mailing lists to which any interested party may
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
        -   SuSE's announce-only mailing list.
            Only SuSE's security announcements are sent to this list.
            To subscribe, send an email to

    For general information or the frequently asked questions (faq)
    send mail to:
        <> or
        <> respectively.

    SuSE's security contact is <> or <>.
    The <> 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:  Function: Security Research and Advisory
  PGP: "lynx -source | pgp -fka"
 Key fingerprint = B5 07 B6 4E 9C EF 27 EE  16 D9 70 D4 87 B5 63 6C
Private:  SuSE: