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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                zlib
        Announcement-ID:        SUSE-SA:2004:029
        Date:                   Thursday, Sep 2nd 2004 17:30:00 MEST
        Affected products:      9.1
                                SUSE Linux Enterprise Server 9
        Vulnerability Type:     denial of service
        Severity (1-10):        3-5
        SUSE default package:   yes
        Cross References:       CAN-2004-0797
                                VU#238678

    Content of this advisory:
        1) security vulnerability resolved:
             - denial of service condition in zlib
        2) solution/workaround
        3) special instructions and notes
        4) package location and checksums
        5) pending vulnerabilities, solutions, workarounds:
            - gaim
            - opera
            - imlib, imlib2
        6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

   zlib is a widely used data compression library. Programs linked against it
   include most desktop applications as well as servers such as Apache and
   OpenSSH.

   The 'inflate' function of zlib handles certain input data
   incorrectly which could lead to a denial of service condition for
   programs using it with untrusted data. Whether the vulnerability
   can be exploided locally or remotely depends on the application
   using it.

   zlib versions older than version 1.2 are not affected.

2) solution/workaround

   There is no known workaround.

3) special instructions and notes

   After applying the update all programs linked against libz must be
   restarted.

4) package location and checksums

    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.


    x86 Platform:

    SUSE Linux 9.1:
          831b925bd07550e53fcef3657416675d
          10f7fb0af45b2c0fd436ddc8a2876697
    patch rpm(s):
          4a0b7a87fc8ed9129b6d940d8b577aa7
          75b7929b89794b07ae96ce6bb833fcb0
    source rpm(s):
          1cb7920050dc98a04377837f626ebd33



    x86-64 Platform:

    SUSE Linux 9.1:
          df1d74ebec5f74da7244ba8fff23feb0
          284ab472d375c567557a9256ca55cdc3
    patch rpm(s):
          7b49fd8bc2c06becd0aec7db62e4cd3d
          a62b558fd4f683eddce9615090ef01b4
    source rpm(s):
          1ab725bb307b26a928edadfdb2d57cbc


______________________________________________________________________________

5) Pending vulnerabilities in SUSE Distributions and Workarounds:

   - gaim
   Various buffer overflow conditions have been found in the gaim
   instant messenger. The MSN protocol parsing has already been fixed
   with the packages announced in the SUSE Security Announcement
   SUSE-SA:2004:025. The packages which fix the other pending
   bugs in gaim will be available on our FTP servers soon. 

   - opera
   The web-browser opera is affected by several security bugs. 
   New packages will soon be available on our FTP servers.

   - imlib, imlib2
   Buffer overflows in the BMP image loader of imlib and imlib2 have been
   discovered. New packages will be available on our FTP servers soon.

______________________________________________________________________________

6)  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 
       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 
       to verify the signature of the package, where  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  .


  - 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-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
                .

    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.
    ====================================================================