SuSE Inc. Information for VU#298233

Samba contains buffer overflow in SMB/CIFS packet fragment reassembly code

Status

Affected

Vendor Statement

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______________________________________________________________________________

                        SuSE Security Announcement

        Package:                samba, samba-client
       Announcement-ID:        SuSE-SA:2003:016
       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.

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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Version: 2.6.3in
Charset: noconv

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-----END PGP SIGNATURE-----

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

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