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SUSE Security Announcement: zlib denial of service (SUSE-SA:2005:043)
From: Ludwig Nussel <ludwig.nussel () suse de>
Date: Thu, 28 Jul 2005 17:47:24 +0200


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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                zlib
        Announcement ID:        SUSE-SA:2005:043
        Date:                   Thu, 28 Jul 2005 13:00:00 +0000
        Affected Products:      9.1, 9.2, 9.3
                                SUSE Linux Enterprise Server 9
                                Novell Linux Desktop 9
                                Open Enterprise Server 9
        Vulnerability Type:     denial of service
        Severity (1-10):        7
        SUSE Default Package:   yes
        Cross-References:       CAN-2005-1849

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             zlib denial of service
           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

   The previous zlib update for CAN-2005-2096 fixed a flaw in zlib that
   could allow a carefully crafted compressed stream to crash an
   application. While the original patch corrected the reported
   overflow, Markus Oberhumer discovered additional ways a stream could
   trigger an overflow. This update fixes those problems as well.
   
   This issue is tracked by the Mitre CVE ID CAN-2005-1849.
   
   Since only zlib 1.2.x is affected, older SUSE products are not
   affected by this problem.

2) Solution or Work-Around

   There is no known workaround, please install the update packages.

3) Special Instructions and Notes

   Please close and restart all programs using zlib after the update.

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-1.2.2-5.4.i586.rpm
          e22e166180e156c09f84b84317232f2d
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/zlib-devel-1.2.2-5.4.i586.rpm
          9ca4fdb05d3fa585c63d878af98a7317
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-32bit-9.3-7.2.x86_64.rpm
          5e75c7c73334ba827def17ea71f9e7a2
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-devel-32bit-9.3-7.2.x86_64.rpm
          6456e311fa21811cda3a9cd684a6a640
   
   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/zlib-1.2.1-74.4.i586.rpm
          0d48ecb24fe312086b7c2b0c5a038d9a
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/zlib-devel-1.2.1-74.4.i586.rpm
          f31b09d3d33b02e65446bfdf86c921af
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-32bit-9.2-200507230712.x86_64.rpm
          a3ce5949fbfd59093dacdd7a9296f5a8
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-devel-32bit-9.2-200507230712.x86_64.rpm
          c8e8d1d19f94d578efa2d8778a343492
   
   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib-1.2.1-70.12.i586.rpm
          2e1b7e050b6ab5fbc30899b7fc30a7ce
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/zlib-devel-1.2.1-70.12.i586.rpm
          b2ae406817ca0644b1534ab53343bc0a
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/i586/zlib-32bit-9.1-200507231731.i586.rpm
          2b4a495d72765d51a78ba5ffa34ebb15
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/i586/zlib-devel-32bit-9.1-200507231731.i586.rpm
          740a06ba1f1a046b7bf0d9ead37f119b
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/zlib-1.2.1-70.12.src.rpm
          c20084c183dc32986804e670635e18dc
   
   x86-64 Platform:
   
   SUSE Linux 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-1.2.2-5.4.x86_64.rpm
          b8f0a85a618efc6b804066147ddb7b7c
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/zlib-devel-1.2.2-5.4.x86_64.rpm
          2c3ae8a389221bcefcdd38a44f9caed1
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/zlib-1.2.2-5.4.src.rpm
          f26be5f1ae412bec5b09494acc00835b
   
   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-1.2.1-74.4.x86_64.rpm
          3461465492ae8cc42521057b56fccf58
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/zlib-devel-1.2.1-74.4.x86_64.rpm
          4b7a425ff93c0891a755124197970470
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/zlib-1.2.1-74.4.src.rpm
          7ebd7618092ccd8f9f92270329f0a414
   
   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/zlib-1.2.1-70.12.x86_64.rpm
          256c2d9594321c0c1de16d6b61a3244e
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/zlib-devel-1.2.1-70.12.x86_64.rpm
          21628e906dd8c92b9e9b4bd1b8a793a0
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/zlib-1.2.1-70.12.src.rpm
          f360dee8caeed6e32787feef84246b33


______________________________________________________________________________

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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