Mailinglist Archive: opensuse-security-announce (9 mails)

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SuSE Security Announcement: openssh (SuSE-SA:2003:038)
  • From: Roman Drahtmueller <draht@xxxxxxx>
  • Date: Tue, 16 Sep 2003 20:44:07 +0000 (UTC)
  • Message-id: <Pine.LNX.4.58.0309162242320.13476@xxxxxxxxxxxx>
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                openssh
        Announcement-ID:        SuSE-SA:2003:038
        Date:                   Tuesday, Sep 16 2003 22:15 MEST
        Affected products:      7.2, 7.3, 8.0, 8.1, 8.2
                                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
                                SuSE Linux Standard Server 8
        Vulnerability Type:     potential remote privilege escalation
        Severity (1-10):        8
        SuSE default package:   yes
        Cross References:       http://www.openssh.com/txt/buffer.adv
                                CERT VU#333628
                                CVE CAN-2003-0693


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

______________________________________________________________________________

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

    The openssh package is the most widely used implementation of the secure
    shell protocol family (ssh). It provides a set of network connectivity
    tools for remote (shell) login, designed to substitute the traditional
    BSD-style r-protocols (rsh, rlogin). openssh has various authentification
    mechanisms and many other features such as TCP connection and X11 display
    forwarding over the fully encrypted network connection as well as file
    transfer facilities.

    A programming error has been found in code responsible for buffer
    management. If exploited by a (remote) attacker, the error may lead to
    unauthorized access to the system, allowing the execution of arbitrary
    commands.
    The error is known as the buffer_append_space()-bug and is assigned the
    Common Vulnerabilities and Exposures (CVE) name CAN-2003-0693.

    At the time of writing this announcement, it is unclear if the
    buffer_append_space()-bug is exploitable. However, an increasing amount
    of TCP connection attempts to port 22 (the ssh default port) has been
    observed in the internet during the past days, which may indicate that
    there exists an exploit for the error.

    Please note that we have disabled the Privilege Separation feature in
    the ssh daemon (sshd) with this update. The PrivSep feature is designed
    to have parts of the ssh daemon's work running under lowered privileges,
    thereby limiting the effect of a possible vulnerability in the code. The
    PrivSep feature is turned on/off by the UsePrivilegeSeparation keyword
    in sshd's configuration file /etc/ssh/sshd_config. The feature is held
    responsible for malfunctions in PAM (Pluggable Authentification Modules).
    The update mechanism will not overwrite configuration files that have
    been altered after the package installation.



    SPECIAL INSTALL INSTRUCTIONS:
    ==============================
    After the update has been successfully applied, the ssh daemon (sshd)
    must be restarted for update package to become effective. To restart the
    ssh daemon after the update, please run the following command as root:

      rcsshd restart


    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.


    Intel i386 Platform:

    SuSE-8.2:
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/openssh-3.5p1-106.i586.rpm
      492d66deaedcfc20c1f0d66e508db790
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/openssh-3.5p1-106.i586.patch.rpm
      c362fedfda79824cb40cd4e5e1055aee
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/openssh-3.5p1-106.src.rpm
      0381b9b4818f8b669631bcab9be80fb5

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssh-3.4p1-214.i586.rpm
      dda7728501c8cf17c60eff1862922842
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/openssh-3.4p1-214.i586.patch.rpm
      d02dfc049413b725c4255887487cfa67
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/openssh-3.4p1-214.src.rpm
      26dd44e9bed7a5ad2d35e56301dc5489

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-214.i386.rpm
      2361dccd5b0c83178f8d0d5988b3490e
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/openssh-3.4p1-214.i386.patch.rpm
      5bef6aff5a603e3376a2f907c494ea7e
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/openssh-3.4p1-214.src.rpm
      203aab39cdb7c5672a82bb07bc4a1f38

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec1/openssh-2.9.9p2-155.i386.rpm
      1418135ed33e59d1ce37ea135617b5bc
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/openssh-2.9.9p2-155.src.rpm
      9d0b789127d30cca9f45c7b1f2268673

    SuSE-7.2:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/openssh-2.9.9p2-155.i386.rpm
      e807ecd9c4d167e3ef3764c06af1a511
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/openssh-2.9.9p2-155.src.rpm
      a99aa03ba94f45dd25054b1ab1a962d7




    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/openssh-2.9.9p2-52.sparc.rpm
      e4f9b7e8763464d60761faf94b7f80f9
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/openssh-2.9.9p2-52.src.rpm
      ca0cbe5b564b03c64458868db369c4de




    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/openssh-2.9.9p2-108.ppc.rpm
      0166ec0aec482b687bc2891611ae8ae9
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/openssh-2.9.9p2-108.src.rpm
      aed7879361a85f263a1cb3a00de964a1



______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  - A buffer overflow vulnerability has been found in the mysql package,
    an Open Source relational database system. The error may allow a remote
    attacker to execute arbitrary code with the privileges of the database
    process.
    We are in the process of building and testing the update packages and
    will release them with a SuSE Security Announcement as soon as possible.

______________________________________________________________________________

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@xxxxxxx),
       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@xxxxxxx" 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@xxxxxxxx
        -   general/linux/SuSE security discussion.
            All SuSE security announcements are sent to this list.
            To subscribe, send an email to
                <suse-security-subscribe@xxxxxxxx>.

    suse-security-announce@xxxxxxxx
        -   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@xxxxxxxx>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <suse-security-info@xxxxxxxx> or
        <suse-security-faq@xxxxxxxx> respectively.

    =====================================================================
    SuSE's security contact is <security@xxxxxxxx> or <security@xxxxxxx>.
    The <security@xxxxxxx> 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@xxxxxxx>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@xxxxxxx>

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-----END PGP SIGNATURE-----

Roman Drahtmueller,
SuSE Security.

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