SuSe: cyrus-imapd buffer overflow

    Date20 Dec 2002
    CategorySuSE
    2248
    Posted ByLinuxSecurity Advisories
    The cyrus imapd contains a buffer overflow which could be exploited by remote attackers prior to logging in.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                cyrus-imapd
            Announcement-ID:        SuSE-SA:2002:048
            Date:                   Fri Dec 20 18:00:00 MET 2002
            Affected products:      7.1, 7.2, 7.3, 8.0, 8.1,
                                    SuSE eMail Server III, 3.1,
                                    SuSE Linux Connectivity Server,
                                    SuSE Linux Enterprise Server 7,
                                    SuSE Linux Enterprise Server 8,
                                    SuSE Linux Office Server,
                                    SuSE Linux Openexchange Server 4
            Vulnerability Type:     remote command execution
            Severity (1-10):        6
            SuSE default package:   no
            Cross References:       -
    
        Content of this advisory:
            1) security vulnerability resolved: Buffer overflows in cyrus-imapd.
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds:
                - MySQL
                - traceroute
                - CUPS
                - imap-2000c
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        The cyrus imapd contains a buffer overflow which could be exploited
        by remote attackers prior to logging in. Attackers could generate oversized
        error messages and overflow buffers inside imapd.
          Additionally to this fix, an overflow in the SASL library (as used by the
        cyrus imapd) has been fixed. This bug only affects SuSE Linux 8.1, the
        SuSE Linux Enterprise Server 8 and the SuSE Linux Openexchange Server.
    
        Since there is no workaround possible except shutting down the IMAP server,
        we strongly recommend an update.
    
        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 IMAP server
        by executing the following commands as root:
    
            /etc/rc.d/cyrus restart
    
        and (if using saslauthd)
    
            /etc/rc.d/saslauthd restart
    
    
        i386 Intel Platform:
    
        SuSE-8.1:
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cyrus-imapd-2.1.9-41.i586.rpm
          47785bc84eeebbddcd50a267684d6500
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cyrus-sasl2-2.1.7-52.i586.rpm
          b740ad1a675f2c14ffc33097a1c41ee5
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cyrus-imapd-2.1.9-41.i586.patch.rpm
          0119fa57ef939939357dd86cd1ec1ea6
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/cyrus-sasl2-2.1.7-52.i586.patch.rpm
          fbf3bad7c6542e45d699c0d69b0798c0
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/cyrus-imapd-2.1.9-41.src.rpm
          a51f1b81249cad5e48e5d05535ae2ab8
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/cyrus-sasl2-2.1.7-52.src.rpm
          98cba687c3d2c89761cc6e9b34cd7e71
    
        SuSE-8.0:
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/cyrus-imapd-2.0.16-361.i386.rpm
          3dd8c8c26753cddb56f9adb2e0a352fe
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/cyrus-imapd-2.0.16-361.i386.patch.rpm
          612e6f1652c536b316a6a480389dc729
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/cyrus-imapd-2.0.16-361.src.rpm
          7c4cd098d4c96726fc2ed21597a8ae3c
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/cyrus-imapd-2.0.16-361.i386.rpm
          bd294c4539c895d16ff11fc8298a6c44
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/cyrus-imapd-2.0.16-361.src.rpm
          689bd12bc2fefc627dd13b45cca68922
    
        SuSE-7.2:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/cyrus-imapd-2.0.16-362.i386.rpm
          feb98be591cd938dee6fbff1b09e11d0
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/cyrus-imapd-2.0.16-362.src.rpm
          2beb58cb743a0923cefbceccea871df2
    
        SuSE-7.1:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/cyrus-imapd-2.0.12-69.i386.rpm
          61f850212a2d2ae72a7446df3b96e891
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/cyrus-imapd-2.0.12-69.src.rpm
          77252f38facbbde01839e817a2f0514d
    
    
        Sparc Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/cyrus-imapd-2.0.16-58.sparc.rpm
          093642ae51cad7a03660ea5b89dd533e
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/cyrus-imapd-2.0.16-58.src.rpm
          4e1bc8e98e61918cce6976c7c373bc53
    
    
        AXP Alpha Platform:
    
        SuSE-7.1:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/cyrus-imapd-2.0.12-24.alpha.rpm
          4194ee9cc379d0d8448029480c7b36b3
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/cyrus-imapd-2.0.12-24.src.rpm
          08ab826ab71a531bb51c12b7fed19919
    
    
        PPC Power PC Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/cyrus-imapd-2.0.16-208.ppc.rpm
          3d57fefb8f9d23a6e863652f148fd4ff
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/cyrus-imapd-2.0.16-208.src.rpm
          4e883ee340e061c948c1835aff15e50b
    
        SuSE-7.1:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/cyrus-imapd-2.0.12-32.ppc.rpm
          d518ece0e01cf731ab2d19c73c82a2de
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/cyrus-imapd-2.0.12-32.src.rpm
          d61b35b30f5704194506ec1238f741bf
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - MySQL
        Stefan Esser from e-matters discovered security critical bugs in the
        MySQL server and client libraries. New packages are currently being built
        and will soon be available. We will inform you with a separate advisory
        when all packages for all platforms are available.
    
        - traceroute
        The recent update for the traceroute package did not fix all overflows
        properly. New packages have been prepared and should already be available
        on our ftp servers. The newly found bugs are not critical since the last
        update for traceroute drops the superuser privileges before the overflow
        can be triggered. However since the attacker could gain access to a raw
        socket upon successfull exploitation, an update is recommended.
    
        - CUPS
        iDEFENSE reported various bugs in the CUPS printing system. These bugs could
        lead to a remote compromise of the system. New packages are already available
        on our ftp servers. We will inform you with a separate advisory when all
        packages for all platforms are available.
    
        - imap-2000c
        The IMAP implementation of the University of Washington contained a buffer
        overflow. This overflow happens after the authentication phase, so only
        remote attackers with a valid IMAP account can exploit this bug. They will
        obtain a shell with their user privileges if exploited properly. ;-)
        Only versions less or eqal to imap-2000c (as shipped up to SL 7.3) are
        affected.
          The author of this imapd does not offer patches for older versions but
        rather suggests to use the newest version available at
         ftp://ftp.cac.washington.edu/mail/imap.tar.Z
        Due to the habbit of the author and the little impact of this bug, we
        do not provide patched pre-build packages.
    
    
    ______________________________________________________________________________
    
    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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