SUSE Security Announcement: zlib denial of service attack (SUSE-SA:2005:039)

6 Jul 2005

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                zlib
        Announcement ID:        SUSE-SA:2005:039
        Date:                   Wed, 06 Jul 2005 14:00:00 +0000
        Affected Products:      9.1, 9.2, 9.3
                                SUSE Linux Enterprise Server 9
                                Novell Linux Desktop 9
                                Open Enterprise Server
        Vulnerability Type:     remote denial of service
        Severity (1-10):        7
        SUSE Default Package:   yes
        Cross-References:       CAN-2005-2096

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             zlib denial of service attack
           Problem Description
        2) Solution or Work-Around
        3) Special Instructions and Notes
        4) Package Location and Checksums
        5) Pending Vulnerabilities, Solutions, and Work-Arounds:
            See SUSE Security Summary Report.
        6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

   A denial of service condition was fixed in the zlib library.

   Any program using zlib to decompress data can be crashed by a specially
   handcrafted invalid data stream. This includes web browsers or email
   programs able to view PNG images (which are compressed by zlib),
   allowing remote attackers to crash browser sessions or potentially
   anti virus programs using this vulnerability.

   This issue is tracked by the Mitre CVE ID CAN-2005-2096.

   Since only zlib 1.2.x is affected, older SUSE products are not affected
   by this problem.

2) Solution or Work-Around

   Install the updated packages.

3) Special Instructions and Notes

   Please restart running programs using zlib.

4) Package Location and Checksums

   The preferred method for installing security updates is to use the YaST
   Online Update (YOU) tool. YOU detects which updates are required and
   automatically performs the necessary steps to verify and install them.
   Alternatively, download the update packages for your distribution manually
   and verify their integrity by the methods listed in Section 6 of this
   announcement. Then install the packages using the command

     rpm -Fhv <file.rpm>

   to apply the update, replacing <file.rpm> with the filename of the
   downloaded RPM package.

   Our maintenance customers are notified individually. The packages are
   offered for installation from the maintenance web.

   x86 Platform:

   SUSE Linux 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/zlib-1.2.2-5.2.i586.rpm
          69306a26b2f9cbaadd139adafe8ec4ac
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/zlib-devel-1.2.2-5.2.i586.rpm
          e8f2b4dd7ac1a58850ceb78f806167fc
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-32bit-9.3-7.1.x86_64.rpm
          08a77c7932298f449c1a82808f254110
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-devel-32bit-9.3-7.1.x86_64.rpm
          5855d394fa83bd00e63c3dd921696ea3

   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/zlib-1.2.1-74.2.i586.rpm
          8f9d09a2d49a351261f4b31eeee7e4cd
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/zlib-devel-1.2.1-74.2.i586.rpm
          2143442ba3f12fa0d76be2fa98b1db8a
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-32bit-9.2-200507042003.x86_64.rpm
          4850236d95a259a406e4d4d6c93b8859
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-devel-32bit-9.2-200507042003.x86_64.rpm
          1d559edb263577bff25d1016777ebb55

   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib-1.2.1-70.9.i586.rpm
          51e2ae37c32d4979d1da05b667289640
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib-devel-1.2.1-70.9.i586.rpm
          3a7fd561f637ecfcf2f3b5118e48327a
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/i586/zlib-32bit-9.1-200507042050.i586.rpm
          8070a09339374edeb50cf1d72249964f
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/i586/zlib-devel-32bit-9.1-200507042050.i586.rpm
          91d1551e541e00e4bfefff68afc7ed8f
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/zlib-1.2.1-70.9.src.rpm
          c2cf9d2d338d44ab0af7cc4612053ef6

   x86-64 Platform:

   SUSE Linux 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-1.2.2-5.2.x86_64.rpm
          9d76d7e17c4bd39b76671ae085667e68
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-devel-1.2.2-5.2.x86_64.rpm
          cc3090fe5ec5abbe7db63cb8f2191643
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/zlib-1.2.2-5.2.src.rpm
          3a5b7b89f1cafe11d6650e45c15105a9

   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-1.2.1-74.2.x86_64.rpm
          f479591a07c85f3a4eddaefdaead314b
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-devel-1.2.1-74.2.x86_64.rpm
          e95130cc47899b7d7e82f2ef9dfcbbd9
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/zlib-1.2.1-74.2.src.rpm
          416613c25a05f474fb146c2c5bd12ee0

   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/zlib-1.2.1-70.9.x86_64.rpm
          acd231a2cbe98589b5e76b07837885c8
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/zlib-devel-1.2.1-70.9.x86_64.rpm
          a2c9ae2e48b5bf6b1612ff2d06e3bd4c
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/zlib-1.2.1-70.9.src.rpm
          fa552f93abcc60e00686185c2b33fa98

______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

   See SUSE Security Summary Report.
______________________________________________________________________________

6) Authenticity Verification and Additional Information

  - Announcement authenticity verification:

    SUSE security announcements are published via mailing lists and on Web
    sites. The authenticity and integrity of a SUSE security announcement is
    guaranteed by a cryptographic signature in each announcement. All SUSE
    security announcements are published with a valid signature.

    To verify the signature of the announcement, save it as text into a file
    and run the command

      gpg --verify <file>

    replacing <file> with the name of the file where you saved the
    announcement. The output for a valid signature looks like:

      gpg: Signature made <DATE> using RSA key ID 3D25D3D9
      gpg: Good signature from "SuSE Security Team <security@suse.de>"

    where <DATE> is replaced by the date the document was signed.

    If the security team's key is not contained in your key ring, you can
    import it from the first installation CD. To import the key, use the
    command

      gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

  - Package authenticity verification:

    SUSE update packages are available on many mirror FTP servers all over the
    world. While this service is considered valuable and important to the free
    and open source software community, the authenticity and the integrity of
    a package needs to be verified to ensure that it has not been tampered
    with.

    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) Using the internal gpg signatures of the rpm package
    2) MD5 checksums as provided in this announcement

    1) The internal 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, replacing <file.rpm> with the
       filename of the RPM package downloaded. The package is unmodified if it
       contains a valid signature from build@suse.de with the key ID 9C800ACA.

       This key is automatically imported into the RPM database (on
       RPMv4-based distributions) and the gpg key ring of 'root' during
       installation. You can also find it on the first installation CD and at
       the end of this announcement.

    2) If you need an alternative means of verification, use the md5sum
       command to verify the authenticity of the packages. Execute the command

         md5sum <filename.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
       SUSE security announcement. Because the announcement containing the
       checksums is cryptographically signed (by security@suse.de), the
       checksums show proof of the authenticity of the package if the
       signature of the announcement is valid. Note that the md5 sums
       published in the SUSE Security Announcements are valid for the
       respective packages only. Newer versions of these packages cannot be
       verified.

  - SUSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   General Linux and SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an e-mail 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 e-mail 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>.

    =====================================================================
    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, the
    clear text signature should show proof of the authenticity of the text.

    SUSE Linux Products GmbH provides 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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Marcus Meissner

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