SuSE alert: openssl

Posted by dave on Feb 26, 2003 6:40 AM EDT
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OpenSSL is an implementation of the Secure Sockets Layer and Transport Layer Security protocols and provides strong cryptography for many applications in a Linux system. It is a default package in all SuSE products.

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

______________________________________________________________________________

                        SuSE Security Announcement

        Package: openssl
        Announcement-ID: SuSE-SA:2003:011
        Date: Wednesday, Feb. 26th 2003 15:20 MET
        Affected products: 7.1, 7.2, 7.3, 8.0, 8.1
                                SuSE Linux Database Server,
                                SuSE eMail Server III, 3.1
                                SuSE Linux Enterprise Server 7
                                SuSE Linux Enterprise Server 8
                                SuSE Linux Firewall on CD/Admin host
                                SuSE Linux Connectivity Server
                                SuSE Linux Office Server
        Vulnerability Type: remote attack on encryption
        Severity (1-10): 5
        SuSE default package: yes
        Cross References: CAN-2003-0078

    Content of this advisory:
        1) security vulnerability resolved: openssl
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - vnc
            - w3m
        3) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion, solution, upgrade information

    OpenSSL is an implementation of the Secure Sockets Layer and Transport
    Layer Security protocols and provides strong cryptography for many
    applications in a Linux system. It is a default package in all SuSE
    products.

    A security weakness has been found, known as "Vaudenay timing attack
    on CBC", named after one of the discoverers (Brice Canvel (EPFL), Alain
    Hiltgen (UBS), Serge Vaudenay (EPFL), and Martin Vuagnoux (EPFL, Ilion)).
    The weakness may allow an attacker to obtain a plaintext data block by
    observing timing differences in response to two different error cases
    (cipher padding errors vs. MAC verification errors).
    In order to exploit this vulnerability, the attacker has to meet certain
    requirements: The network connection between client and server must be
    of high quality to be able to observe timing differences, the attacker
    must be able to perform a man-in-the-middle attack, the transactions
    must repeatedly contain the same (encrypted) plain text block (such as
    a pop password or alike), and decoding failures in the SSL layer must
    not be propagated to the application that is using the SSL connection.
    These exploitation conditions considerably reduce the security risk
    imposed by the vulnerability. However, we recommend to completely
    remedy this weakness by installing the update packages for your system
    according to the following guidelines. There does not exist any temporary
    workaround for this problem other than applying the update packages.

    Please download the update package for your distribution and verify its
    integrity by the methods listed in section 3) of this announcement.
    Our maintenance customers are being notified individually. The packages
    are being offered to install from the maintenance web.

    SPECIAL INSTALLATION INSTRUCTIONS:
    ====================================
    Please update your openssl package using the command
        rpm -Fhv <package.rpm>
    The operation of this command must not be interrupted! An interrupted
    update of the openssl package may cause large protions of your system to
    fail.
    After performing the update, it is adviseable to run the command
    "ldconfig" to update the shared library loading cache.
    After the update, running processes in your system will continue to
    use the shared libraries from the old package before the update.
    Generally, it is necessary to restart all of these processes to
    completely fix the vulnerability in your system. The command
        lsof -n 2>/dev/null | grep RPMDELETE
    can be used to find the binaries and processes that still use the old
    shared libraries. In all cases, the next reboot of the system will cause
    the old shared libraries to be completely removed from the system.
    Alternatively, a transition to runlevel 1 (single user mode) and back
    to the default runlevel will have the same effect.

    Intel i386 Platform:

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssl-0.9.6g-55.i586.rpm
      7fbf4d975180a20ff8dedc8adbdecc59
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssl-0.9.6g-55.i586.patch.rpm
      6ed4321ec536aa718189702470c33091
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/openssl-0.9.6g-55.src.rpm
      90fc753346dd2aff00eee4c530cea84a

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssl-0.9.6c-83.i386.rpm
      d6246b820780993cc0e2b48597743a8f
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssl-0.9.6c-83.i386.patch.rpm
      2d933e913a9062de6a1fa35de969d211
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/openssl-0.9.6c-83.src.rpm
      b4b887a7311e9734a14d11e1a380f76e

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/openssl-0.9.6b-154.i386.rpm
      d3c0f892441c09c8c5a689e2af04ba55
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/openssl-0.9.6b-154.src.rpm
      31ec962fe3549a713b9e6937190a88fb

    SuSE-7.2:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/openssl-0.9.6a-78.i386.rpm
      d14f67c34c589f168b750b18c9162508
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/openssl-0.9.6a-78.src.rpm
      2ba5a416d6ca3cb75c9aabb5a25bb532

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/sec1/openssl-0.9.6a-78.i386.rpm
      c6b711573555982fadd31cfa179dd9dc
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/openssl-0.9.6a-78.src.rpm
      d00df30aa6ec6a3872c58da709181879

    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/openssl-0.9.6b-87.sparc.rpm
      6a8f19a49a698b93e740121321f59e5d
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/openssl-0.9.6b-87.src.rpm
      50712c3fd35042278063622ad5cc77c7

    AXP Alpha Platform:
    The packages for the 7.1-axp distribution will be published soon.

    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/openssl-0.9.6b-147.ppc.rpm
      051ef85d8e711819b2de38f55dc0023a
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/openssl-0.9.6b-147.src.rpm
      58631776b8fa88932eb57069a7f2878e

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/sec1/openssl-0.9.6a-28.ppc.rpm
      da5e7caa177316f3016dd98497e580de
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/openssl-0.9.6a-28.src.rpm
      b317144556c8f1890d15f304d95c5764

______________________________________________________________________________

2) Pending vulnerabilities in SuSE Distributions and Workarounds:

  - vnc
    VNC (Virtual Network Computing) uses a weak cookie generation process
    which can be exploited by an attacker to bypass authentication.
    New packages are currently being tested and will be available on our
    FTP servers soon.

  - w3m
    The textbased web-browser w3m does not properly escape HTML tags.
    A malicious HTML page or img alt attribute may lead to information
    leakage. New packages will be available soon.
______________________________________________________________________________

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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-- 
 -                                                                      -
| Roman Drahtm├╝ller      <draht@suse.de> // "You don't need eyes to see, |
  SuSE Linux AG - Security       Phone: //             you need vision!"
| N├╝rnberg, Germany     +49-911-740530 //           Maxi Jazz, Faithless |
 -                                                                      -
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