SuSE Security Announcement: sendmail (SuSE-SA:2003:013)

From: Roman Drahtmueller (draht@suse.de)
Date: 03/03/03

  • Next message: Mandrake Linux Security Team: "MDKSA-2003:028 - Updated sendmail packages fix remotely exploitable buffer overflow vulnerability"
    Date: Mon, 3 Mar 2003 20:20:29 +0100 (MET)
    From: Roman Drahtmueller <draht@suse.de>
    To: bugtraq@securityfocus.com
    
    

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

    ______________________________________________________________________________

                            SuSE Security Announcement

            Package: sendmail, sendmail-tls
            Announcement-ID: SuSE-SA:2003:013
            Date: Monday, March 3rd 2003, 18:10 MET
            Affected products: 7.1, 7.2, 7.3, 8.0, 8.1
                                    SuSE Linux Database Server,
                                    SuSE Linux Enterprise Server 7, 8
                                    SuSE Linux Firewall on CD/Admin host
                                    SuSE Linux Connectivity Server
                                    SuSE Linux Office Server
            Vulnerability Type: local privilege escalation
            Severity (1-10): 7
            SuSE default package: yes (until SuSE Linux 8.0 and SLES7)
            Cross References: http://www.cert.org/advisories/CA-2003-07.html

        Content of this advisory:
            1) security vulnerability resolved: sendmail
               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

        sendmail is the most widely used mail transport agent (MTA) in the
        internet. A remotely exploitable buffer overflow has been found in all
        versions of sendmail that come with SuSE products. These versions include
        sendmail-8.11 and sendmail-8.12 releases. sendmail is the MTA subsystem
        that is installed by default on all SuSE products up to and including
        SuSE Linux 8.0 and the SuSE Linux Enterprise Server 7.

        The vulnerability is triggered by an email message sent through the
        sendmail MTA subsystem. In that respect, it is different from commonly
        known bugs that occur in the context of an open TCP connection. By
        consequence, the vulnerability also exists if email messages get forwarded
        over a relay that itself does not run a vulnerable MTA. This specific
        detail and the wide distribution of sendmail in the internet causes this
        vulnerability to be considered an error of major severity.

        The buffer overflow happens on the heap and is known to be exploitable.
        As of the writing of this announcement, there is no exploit known to exist
        in the public. Since there is no known workaround for this vulnerability
        other than using a different MTA, it is strongly recommended to install
        the update packages as offered at the locations as listed below.

        We would like to express our gratitude to Eric Allman for notifying
        SuSE Security of the problem. The vulnerability was discovered by
        ISS Internet Security Systems, inc.

        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.

        SPECIAL INSTALL INSTRUCTIONS:
        ==============================
        After performing the update, it is necessary to restart all running
        instances of sendmail using the command "rcsendmail restart" as root.

        Intel i386 Platform:

        SuSE-8.1:
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12.6-91.i586.rpm
          0f3d981ad8e9be64bc70aff474ce303c
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-devel-8.12.6-91.i586.rpm
          afe98a29de75ecd362fad5b02a922856
        patch rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12.6-91.i586.patch.rpm
          ebd8f188748812aff2830b23de6f34b3
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-devel-8.12.6-91.i586.patch.rpm
          09ff6834c369051d165d78f01a44d684
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sendmail-8.12.6-91.src.rpm
          50e471df3a90ce4b54b2c5ca3fbc081e

        SuSE-8.0:
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-72.i386.rpm
          09e0a8ed5b189c7c819d3d38f74a07e1
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/sendmail-devel-8.12.3-72.i386.rpm
          72a8c31090299df6b7bd52ea38c31c2b
        patch rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-72.i386.patch.rpm
          905b39525ecd0506892b442a204b7aa3
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/sendmail-devel-8.12.3-72.i386.patch.rpm
          a03e4a221c1fb8f2387dc133ada9e604
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sendmail-8.12.3-72.src.rpm
          6e3106de72c4605d379dc2133adba97b

        SuSE-7.3:
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/sendmail-8.11.6-162.i386.rpm
          9d04ffb6a8d6f1fe6e2efe217de69ad7
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/sendmail-tls-8.11.6-164.i386.rpm
          ebf8d1b2ef233a68b0326e6ce6974994
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sendmail-8.11.6-162.src.rpm
          aebf9a30089a13717928e9ba5309a6ed
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sendmail-tls-8.11.6-164.src.rpm
          371e39b10ee7d4c255e96e935c473aa8

        SuSE-7.2:
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/sendmail-8.11.3-106.i386.rpm
          dbff6db47875bc00a95409cba9498c49
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/sendmail-tls-8.11.3-110.i386.rpm
          7c7af39c8179219f6302707ab67bacea
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-8.11.3-106.src.rpm
          85ff9f88013f6f0b23ed8fb15704bc82
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-tls-8.11.3-110.src.rpm
          7502589ff50b89f86398571c5686c23c

        SuSE-7.1:
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/sendmail-8.11.2-44.i386.rpm
          701f6c5d9748e0b9cd5606cdaaa84cd8
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/sec2/sendmail-tls-8.11.2-45.i386.rpm
          1583015b284c5166c9bd862c3e24bf14
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-8.11.2-44.src.rpm
          b51e8383dc11ca9be65e05ee4209f740
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-tls-8.11.2-45.src.rpm
          3de4e382d512f6175cc5050d393d76a0

        Sparc Platform:

        SuSE-7.3:
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/sendmail-8.11.6-63.sparc.rpm
          0f70b263b09c319dcf698786b14de86f
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/sendmail-tls-8.11.6-63.sparc.rpm
          e7a3f0c6fadcbaedc9736c2a7a08aa5f
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sendmail-8.11.6-63.src.rpm
          1a455df96d094008fcd7bc96f49ab938
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sendmail-tls-8.11.6-63.src.rpm
          20d1fdca82189f4492a1dd28ba0d7e92

        AXP Alpha Platform:

        SuSE-7.1:
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/sendmail-8.11.2-30.alpha.rpm
          dfdd75f7e970002742135a5f48c9be71
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/sec2/sendmail-tls-8.11.2-37.alpha.rpm
          ff6d0889f04eff5564c9e498954f9a85
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-8.11.2-30.src.rpm
          92bd9eee0d1b9eac76f4835f4f20dfe2
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-tls-8.11.2-37.src.rpm
          a5e9e67a860bfd6b873cb9d95134405b

        PPC Power PC Platform:

        SuSE-7.3:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/sendmail-8.11.6-120.ppc.rpm
          ef7b092c43dddc3fcdfa45946df42232
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/sendmail-tls-8.11.6-119.ppc.rpm
          927355dfa069ad1f032a1036ad65fb2c
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sendmail-8.11.6-120.src.rpm
          35c672698ccaa213c6e42b2888ac24ad
        ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sendmail-tls-8.11.6-119.src.rpm
          c1ff2ba2174ed85c47fad4149e82e564

        SuSE-7.1:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/sendmail-8.11.2-33.ppc.rpm
          d703b68846212626fdf1e1d3e15c733f
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/sec2/sendmail-tls-8.11.2-36.ppc.rpm
          d98905aaa881fec5684f32ff1d4927de
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-8.11.2-33.src.rpm
          b582465c56651e15153ad5a0239cea6a
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-tls-8.11.2-36.src.rpm
          f1ef3e9c0f346cf4e7c4f9f70b049878

    ______________________________________________________________________________

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

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  • Next message: Mandrake Linux Security Team: "MDKSA-2003:028 - Updated sendmail packages fix remotely exploitable buffer overflow vulnerability"

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