SuSe: postfix multiple vulnerabilities

    Date04 Aug 2003
    CategorySuSE
    2551
    Posted ByLinuxSecurity Advisories
    Michal Zalewski has reported problems in postfix which can lead to a remote DoS attack or allow attackers to bounce-scan private networks.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                postfix
            Announcement-ID:        SuSE-SA:2003:033
            Date:                   Mon Aug  4 13:30:00 MEST 2003
            Affected products:      7.2, 7.3, 8.0, 8.1
                                    SuSE Linux Database Server
                                    SuSE eMail Server III, 3.1
                                    SuSE Linux Enterprise Server 7, 8
                                    SuSE Linux Connectivity Server
                                    SuSE Linux Office Server
                                    SuSE Linux Openexchange Server
                                    UnitedLinux 1.0
                                    SuSE Linux Desktop 1.0
            Vulnerability Type:     remote Denial of Service (DoS) attack
            Severity (1-10):        4
            SuSE default package:   Since SuSE Linux 8.1.
            Cross References:       CAN-2003-0468
                                    CAN-2003-0540
    
        Content of this advisory:
            1) security vulnerability resolved: remote DoS in postfix
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds:
                - kernel
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        Postfix is a flexible MTA replacement for sendmail.
          Michal Zalewski has reported problems in postfix which can lead to
        a remote DoS attack or allow attackers to bounce-scan private networks.
        These problems have been fixed. Even though not all of our products are
        vulnerable in their default configurations, the updates should be applied.
    
        In order for the update to take effect, you have to restart your MTA
        by issuing the following command as root:
    
          "/sbin/rcpostfix 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.
    
        i386 Intel Platform:
    
        SuSE-8.1:
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/postfix-1.1.12-12.i586.rpm
          4b3b65905911440051f869b3e95c2c66
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/postfix-1.1.12-12.i586.patch.rpm
          e73917624b5adfdbe113909135a50a42
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/postfix-1.1.12-12.src.rpm
          0e5bcc6c3cd95f09c423cf00aac0c303
    
        SuSE-8.0:
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/postfix-1.1.12-13.i386.rpm
          e0090e0ed051a532a62d787b020ac580
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/postfix-1.1.12-13.i386.patch.rpm
          8c156ca92ad4be83588041192efe5b60
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/postfix-1.1.12-13.src.rpm
          f9389f00de109cea2f0b3b6c27f5a515
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/postfix-20010228pl08-22.i386.rpm
          1f4d3af8d10850096bc0260567caa334
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/postfix-20010228pl08-22.src.rpm
          0ccc29a957609b3aeb2c12f3cc85284d
    
        SuSE-7.2:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/postfix-20010228pl03-82.i386.rpm
          444f983a8c8f0d18621a1e8b4c3dd260
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/postfix-20010228pl03-82.src.rpm
          6d479bd0ed90bc7dc59a4201327ffc05
    
    
        Sparc Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/postfix-20010228pl08-15.sparc.rpm
          83eb074dbcedae2c9947006b4c0411d2
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/postfix-20010228pl08-15.src.rpm
          ec7ae58e31fd2ec63ccd881454372307
    
    
        PPC Power PC Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/postfix-20010228pl08-36.ppc.rpm
          f7b331c15b7bf705274afe2665e9e187
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/postfix-20010228pl08-36.src.rpm
          f2e5aa58e24599777a95dce715c3bcad
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - kernel
        Various bugs inside the kernel have been reported recently. The most
        important ones are
          - NFSv3 remote DoS
          - netfilter DoS
          - /proc infoleak
          - race condition in the ELF loader
        These bugs are fixed. The new kernel packages will be approved as soon as
        the testing is finished.
    
    ______________________________________________________________________________
    
    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.
        =====================================================================
    
    
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