SuSE: 'heimdal' Multiple vulnerabilities

    Date30 Sep 2002
    CategorySuSE
    2485
    Posted ByLinuxSecurity Advisories
    While doing so several possible buffer overflows and other bugs have been uncovered and fixed.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                heimdal
            Announcement-ID:        SuSE-SA:2002:034
            Date:                   Mon Sep 30 17:00:00 CEST 2002
            Affected products:      SuSE Linux 7.2, 7.3, 8.0,
                                    SuSE eMail Server,
                                    SuSE Linux Connectivity Server,
                                    SuSE Linux Enterprise Server 7,
                                    SuSE Linux Office Server
            Vulnerability Type:     remote command execution
            Severity (1-10):        8
            SuSE default package:   Yes
            Cross References:        http://www.pdc.kth.se/heimdal
    
        Content of this advisory:
            1) security vulnerability resolved: Various overflows in heimdal.
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds:
                - ghostview/kghostview
                - fetchmail
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        The Heimdal package is a free Kerberos implementation offering flexible
        authentication mechanisms based on the Kerberos 5 and Kerberos 4 scheme.
          The SuSE Security Team has reviewed critical parts of the Heimdal
        package such as the kadmind and kdc server. While doing so several
        possible buffer overflows and other bugs have been uncovered and fixed.
        Remote attackers can probably gain remote root access on unpatched systems.
        Since these services run usually on authentication servers we consider
        these bugs to be very serious. An update is strongly recommended if you are
        using the Heimdal package.
    
        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.
    
        To be sure the update takes effect you have to restart the services which
        belong to the heimdal package. As root execute the command
    
           /etc/rc.d/kdc restart
    
        If you are running other Kerberos based services such as hpropd make sure
        you also restart them as well.
    
    
        i386 Intel Platform:
    
        SuSE-8.0
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/heimdal-devel-0.4e-191.i386.rpm
          9dcb318864c2ad7c8bb11a51b0c1e12a
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec1/heimdal-lib-0.4e-191.i386.rpm
          7971b5a482b0f8521c0a8bd07182be36
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/sec3/heimdal-0.4e-191.i386.rpm
          fb6792204a9ec58f69a9dc7b4bcbed59
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/heimdal-0.4e-191.src.rpm
          976383f4b7eeabcfc48ab4360a14586f
    
        SuSE-7.3
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/heimdal-0.4d-132.i386.rpm
          d2f174640a8d3b976eef3ff3afb642ee
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/heimdal-devel-0.4d-132.i386.rpm
          fad86035d9b94aa50a9225c9e40618da
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/heimdal-0.4d-132.src.rpm
          5d3afb07af86563e5eff5f0fad6113d4
    
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec1/heimdal-lib-0.3e-83.i386.rpm
          7a5f3f3e1c16481b6dea589bedd7ee44
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/heimdal-0.3e-83.i386.rpm
          f94d2a88a2100b2b28496b1a8f3030c4
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/heimdal-devel-0.3e-83.i386.rpm
          d4fa5f75cb1d422fe439a276fdfe8aca
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/heimdal-0.3e-83.src.rpm
          a42a3535e0bd5966eb8b9d017213dfb5
    
    
        Sparc Platform:
    
        SuSE-7.3
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec1/heimdal-lib-0.4d-67.sparc.rpm
          c50802492db0e8728d666f3b38b7ca5e
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/heimdal-0.4d-67.sparc.rpm
          595d21ca05b8c886c0887189bb76487d
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/heimdal-devel-0.4d-67.sparc.rpm
          1dfe9d49c83303ddf3490497dffce7fa
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/heimdal-0.4d-67.src.rpm
          7c61896ca257f79656e35bc59e1de734
    
    
        PPC Power PC Platform:
    
        SuSE-7.3
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec1/heimdal-lib-0.4d-113.ppc.rpm
          e905e8c468b9eddef6b8a785d5241914
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/heimdal-0.4d-113.ppc.rpm
          7b816aa786118e481be811be6974177f
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/heimdal-devel-0.4d-113.ppc.rpm
          100f9fbe35d82dcf02aed98aa70103b8
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/heimdal-0.4d-113.src.rpm
          24467d712a359516ae60462c56dc97df
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - ghostview/kghostview
        Bufferoverflows have recently been discovered in these packages. They allow
        attackers to execute arbitrary code with the privileges of the user
        viewing special crafted documents created by the attacker. New packgaes will
        soon be available on our ftp servers.
    
        - fetchmail
        Fetchmail contains remotely exploitable overflows in the mail header
        parsing functions. In depth discussion of these problems can be found at
         http://security.e-matters.de/advisories/032002.html.
        New packages will soon be available on our ftp servers.
    
    ______________________________________________________________________________
    
    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 
           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 This email address is being protected from spambots. You need JavaScript enabled to view it.),
           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 "This email address is being protected from spambots. You need JavaScript enabled to view it." 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:
    
        This email address is being protected from spambots. You need JavaScript enabled to view it.
            -   general/linux/SuSE security discussion.
                All SuSE security announcements are sent to this list.
                To subscribe, send an email to
                    <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
    
        This email address is being protected from spambots. You need JavaScript enabled to view it.
            -   SuSE's announce-only mailing list.
                Only SuSE's security announcements are sent to this list.
                To subscribe, send an email to
                    <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
    
        For general information or the frequently asked questions (faq)
        send mail to:
            <This email address is being protected from spambots. You need JavaScript enabled to view it.> or
            <This email address is being protected from spambots. You need JavaScript enabled to view it.> respectively.
    
        =====================================================================
        SuSE's security contact is <This email address is being protected from spambots. You need JavaScript enabled to view it.> or <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
        The <This email address is being protected from spambots. You need JavaScript enabled to view it.> 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 <This email address is being protected from spambots. You need JavaScript enabled to view it.>
    pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <This email address is being protected from spambots. You need JavaScript enabled to view it.>
    
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