SuSE Inc. Information for VU#958321

Samba contains a remotely exploitable stack buffer overflow

Status

Affected

Vendor Statement

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

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                samba
       Announcement-ID:        SuSE-SA:2002:045
       Date:                   Wednesday, November 20th 2002 16:00 MET
       Affected products:      7.2, 7.3, 8.0, 8.1
                               SuSE Linux Database Server,
                               SuSE eMail Server III, 3.1
                               SuSE Linux Enterprise Server 7+8,
                               SuSE Linux Firewall on CD/Admin host
                               SuSE Linux Connectivity Server
                               SuSE Linux Office Server
       Vulnerability Type:     possible remote code execution
       Severity (1-10):        7
       SuSE default package:   no
       Cross References:      
http://www.samba.org/

    Content of this advisory:
       1) security vulnerability resolved: samba
          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

    Samba developer Steve Langasek found a security problem in samba, the
   widely known free implementation of the SMB protocol.

    The error consists of a buffer overflow in a commonly used routine
   that accepts user input and may write up to 127 bytes past the end of
   the buffer allocated with static length, leaving enough room for
   an exploit. The resulting vulnerability can be exploited locally
   in applications using the pam_smbpass Pluggable Authentication Module
   (PAM). It may be possible to exploit this vulnerability remotely,
   causing the running smbd to crash or even to execute arbitrary code.

    The samba package is installed by default only on the SuSE Linux
   Enterprise Server. SuSE Linux products do not have the samba and
   samba-client packages installed by default.
   The samba packages in SuSE Linux version 7.1 and before are not affected
   by this vulnerability.
   For the bug to be exploited, your system has to be running the smbd
   samba server, or an administrator must have (manually) changed the
   configuration of the PAM authentification subsystem to enable the use
   of the pam_smbpass module. The samba server process(es) are not activated
   automatically after installation (of the package).

    The samba subsystem on SuSE products is split into two different
   subpackages: samba and smbclnt up to and including SuSE Linux 7.2, on
   SuSE Linux 7.3 and newer the package names are samba and samba-client.
   To completely remove the vulnerability, you should update all of the
   installed packages.

    We wish to express our gratitude to the samba development team and
   in particular to Steve Langasek and Volker Lendecke who provided the
   patches and communicated them to the vendors. Please know that the
   samba team will release the new version 2.2.7 of the samba software to
   address the security fix at the same time as this announcement gets
   published. More information about samba (and the security fix) is
   available at
http://www.samba.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.

    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      # SuSE Linux, all versions
       rcnmb restart      # only on SuSE Linux 8.1



    Intel i386 Platform:

    SuSE-8.1:
   
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-124.i586.rpm
     f0a94ef6cc49165d4dace59caaf359d7
   
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-124.i586.rpm
     f694fb4aaabffa98b6a76941cb2c0eaf
   patch rpm(s):
   
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-124.i586.patch.rpm
     af43bc1d5dc1b097389933f34ca5a625
   
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-124.i586.patch.rpm
     bff278f9366df7efe72fa880c4f7618f
   source rpm(s):
   
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/samba-2.2.5-124.src.rpm
     674adb466663259c2117852b9525a29a

    SuSE-8.0:
   
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-165.i386.rpm
     8c7edd09c5acfc269467ecbcdcdfc21c
   
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-165.i386.rpm
     bfc08a1d64f0d85670041c7046d1e775
   patch rpm(s):
   
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-165.i386.patch.rpm
     7d08c2c07137d9da0b3d1a301295a084
   
ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-165.i386.patch.rpm
     887230d4ed61bec496dff73c50fa3de0
   source rpm(s):
   
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/samba-2.2.3a-165.src.rpm
     b208c4d5bcceb7f9cc18df75b7831d2d

    SuSE-7.3:
   
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/samba-2.2.1a-206.i386.rpm
     dc4232333a0babbb257cff346609625f
   
ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/samba-client-2.2.1a-206.i386.rpm
     163a565a5a0b0320eae6ba1d0ebdfb27
   source rpm(s):
   
ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/samba-2.2.1a-206.src.rpm
     6086e3bb296a320c28fced9068c931fc

    SuSE-7.2:
   
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/samba-2.2.0a-45.i386.rpm
     184b17987ca99325782f4c7f9e04b6a6
   
ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/smbclnt-2.2.0a-45.i386.rpm
     b9926ade015ccaf271088da246814abb
   source rpm(s):
   
ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/samba-2.2.0a-45.src.rpm
     384ec49b0b8a81d8ecf7c84ef0fa2689




    Sparc Platform:

    SuSE-7.3:
   
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/samba-2.2.1a-69.sparc.rpm
     61b72787bc8e0b333662962a60bce0c2
   
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/samba-client-2.2.1a-69.sparc.rpm
     6acd0ffd218d721d7c10b17e1194738d
   source rpm(s):
   
ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/samba-2.2.1a-69.src.rpm
     77f57a3277bb1a270ae79bc94ee28345



    PPC Power PC Platform:

    SuSE-7.3:
   
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/samba-2.2.1a-141.ppc.rpm
     d127afabc7d5b764289f9b65ad4c4cd1
   
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/samba-client-2.2.1a-141.ppc.rpm
     894132f3b5041a54ec871d67eef072e5
   source rpm(s):
   
ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/samba-2.2.1a-141.src.rpm
     ccff812fdddd3af9d62a399f63e0405e




______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  - 7.0 update trees
   We will move the SuSE Linux 7.0 update tree structure to the
   /pub/suse/discontinued/ tree shortly, following the announcement about
   discontinued products on Tue, 29 Oct 2002.

______________________________________________________________________________

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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Vendor Information

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

Vendor References

None

Addendum

The CERT/CC has no additional comments at this time.

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