SuSE: 'sendmail' vulnerability

    Date23 Aug 2001
    CategorySuSE
    2629
    Posted ByLinuxSecurity Advisories
    Cade Cairns of Securityfocus discovered a vulnerability in the sendmail program, the widely spread MTA used in Unix- and Unix-like systems.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                sendmail
            Announcement-ID:        SuSE-SA:2001:028
            Date:                   Thursday, Aug 23rd 2001 18:10 MEST
            Affected SuSE versions: 7.0, 7.1, 7.2
            Vulnerability Type:     local root compromise
            Severity (1-10):        5
            SuSE default package:   yes
            Other affected systems: systems using the sendmail package
    
        Content of this advisory:
            1) security vulnerability resolved: sendmail
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        Cade Cairns of Securityfocus discovered a vulnerability in the sendmail
        program, the widely spread MTA used in Unix- and Unix-like systems.
        A local user can write arbitrary data to the process memory, resulting
        in user-controlled code to be executed as user root.
        Please note that this is a _local_ vulnerability: Local shell access
        is needed for the attacker to be able to take advantage of this error.
        The /usr/sbin/sendmail program is installed set-uid root in most
        installations. This special privilege is needed for the sendmail program
        to operate properly. The attack pattern involves running sendmail to
        make use of the setuid-bit.
        Please note that this is the first sendmail security problem since 1997.
    
        In this case, the vulnerability can be classified as a commandline
        processing bug while running with extended (root) privilege.
        The error itself is a result of a comparison between a signed and an
        unsigned integer when checking user-supplied data from the sendmail
        command line: A high unsigned value is being considered a negative
        signed value. A subsequent comparison is being evaluated the wrong way.
        These errors are expected to make up a new class of vulnerabilities for
        programs written in C in the near future.
    
        The supported SuSE Linux distributions 6.3 and 6.4 use a sendmail of
        version 8.9.3. According to Sendmail Inc., this version is not
        affected by this signedness bug.
        The SuSE Linux distributions 7.0, 7.1 and 7.2 use sendmail version
        8.11.x. All 7.x distributions are affected by the problem.
    
    
        SuSE provides update packages for the affected distributions. Please
        download the update package for your distribution and use the command
        'rpm -Uhv file.rpm' to apply the update.
        It is recommended to stop the running sendmail process(es) before
        applying the update. Use the command 'rcsendmail stop' to do this,
        and 'rcsendmail start' to restart the service after the update has
        been applied. Since the update packages only fix the security problem
        from this announcement, no reconfiguration should be necessary.
    
        SPECIAL INSTALL INSTRUCTIONS:
        The sendmail package needs one out of two commands to be executed after
        package installation. Use the commands
            SuSEconfig
        or, alternatively (if you have disabled SuSEconfig in /etc/rc.config),
            chkstat -set /etc/permissions.d/sendmail
        to set the permissions of the sendmail package files correctly. Without
        these permission changes, the /usr/sbin/sendmail program will not operate
        properly. (Side note: All of the commands above have to be run as root!)
    
    
    
        i386 Intel Platform:
    
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/sendmail-8.11.3-68.i386.rpm
          edffc3231b74858c218e540ffb37740a
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/sendmail-tls-8.11.3-72.i386.rpm
          6a99faaaf394ab7b6dd22d9d81fb221b
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-8.11.3-68.src.rpm
          e914fef1f5fb1c65bb7b52383f9832db
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/sendmail-8.11.2-34.i386.rpm
          6cf817fe71a07fc58d4b201df01291b5
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/sec2/sendmail-tls-8.11.2-29.i386.rpm
          d96f3e373f7c628d5792a2567e02e4c3
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-8.11.2-34.src.rpm
          35c53244eafc645d4d9218d95c4f6d71
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/sendmail-8.11.0-5.i386.rpm
          29250e9986dfd22c7bdf637ac5dcc646
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/sendmail-8.11.0-5.src.rpm
          13153a10c4223450119d2bd57178b8d4
    
    
    
    
        Sparc Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/sendmail-8.11.2-17.sparc.rpm
          08b83155a16e86bf0b41596b66115443
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/sec2/sendmail-tls-8.11.2-16.sparc.rpm
          3d0b567682df307f13e552b4f85b798b
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/sendmail-8.11.2-17.src.rpm
          a67beda92d8cbae62e8d69b263970108
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/sendmail-8.11.0-3.sparc.rpm
          17c9c5ce0814ee9821d7646d7ea399de
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/sendmail-8.11.0-3.src.rpm
          d737219fb680f990d52faff49d53a48f
    
    
    
    
        AXP Alpha Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/sendmail-8.11.2-19.alpha.rpm
          6b7729f0c2b5dde8abb55102310bc039
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/sec2/sendmail-tls-8.11.2-21.alpha.rpm
          c49dd3298689e2247a5228dfb3022949
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-8.11.2-19.src.rpm
          bfa6c0c95baa236cebcf501e4efdb0e9
    
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/sendmail-8.11.2-23.ppc.rpm
          1ad2a5891a03cffd33baab76d0aed4f9
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/sec2/sendmail-tls-8.11.2-21.ppc.rpm
          b1181efdc649f005bc4a2b3fce08d164
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-8.11.2-23.src.rpm
          4caafc40ff5332dab46cc60e3f2a85fb
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/sendmail-8.11.0-33.ppc.rpm
          27d5ac4d6d809a1ae88cf6a3fefe1d64
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/sendmail-8.11.0-33.src.rpm
          f6600b2aac4d3f8356494a3d047c72f9
    
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions, Workarounds and misc:
    
      - ftp server
        Our ftp server ftp.suse.com has been reorganized. The changes in
        particular are:
        * The discontinued distributions (SuSE Linux before (and including) 6.2)
          have moved to an own tree: /pub/suse/discontinued/.
          The tree there is built exactly like the tree for the currently
          supported distributions (6.3 and up).
          This change has been made to keep users from automatically applying
          updates against old problems that have been superceded by newer updates
          which are not available for the discontinued distributions.
        * The /pub/suse//{KDE,KDE2,GNOME,X} directories have been moved
          to an own tree: /pub/suse//supplementary/. The KDE directory
          has become famous in the KDE scene because it contains the latest
          KDE packages compiled for a SuSE distribution.
          This has been done to point out that the packages in this directory
          have been built for the respective distribution, they are tested ok,
          but since these packages have never been part of the distribution
          they are built for, there is no support for them; the packages are
          provided as-is.
        * During the next days, all packages under the /pub/suse//update/
          tree will be gpg-signed with the This email address is being protected from spambots. You need JavaScript enabled to view it. DSA key (see section 3
          of this announcement).
        Currently, most of the formerly existing directories that have been moved
        are now still visible through a symlink, pointing at a directory with
        a README.
        The directory paths to the update packages for the supported distributions
        have _not_ changed.
        We kindly request mirror admins to adopt the changes to their trees.
        If you run a publically accessible mirror of ftp.suse.com, you are
        invited to send a mail to This email address is being protected from spambots. You need JavaScript enabled to view it. so that you are being
        notified of such changes in advance.
    
    
      - in.telnetd
        A buffer overflow vulnerability has been found in the in.telnetd telned
        daemon, a service that is enabled by default in all SuSE Linux
        distributions. The vulnerability may allow a remote attacker to gain root
        access to your system. Many unix- and unix-like operating systems are
        affected by this or a similar problem.
        There are update packages for the SuSE Linux distributions 7.1 and 7.2
        on our ftp server. The packages for the 7.1 distribution are called
        "nkitserv", for the 7.2 distributions, the name is telnet-server.
        For completeness, we also provide the other packages that are made from
        the same source rpm. Since these packages do not fix a security problem,
        there is no reason to list them here.
        We are working on a suitable solution for the 7.0 and 6.x distributions,
        while it has turned out that a fix for these distributions is non-trivial
        because a different code base has been used for these packages.
        telnet is an unencrypted protocol that offers many attack possibilities.
        If at all possible, please deactivate your telnetd by commenting it out
        in /etc/inetd.conf (killall -HUP inetd afterwards to make inetd reload
        its configuration file!). We recommend to use one of the two ssh
        implementations on our distributions as a substitute of the telnet
        protocol. Clients are available on the internet for most platforms and
        operating systems.
        An announcement will be released soon that addresses the problem in
        in.telnetd.
    
    
      - Yesterday (Wednesday, 20010822) Bob Vickers (Dept of Computer Science,
        University of London) reported a locally exploitable security hole in
        the script /etc/init.d/boot. The critical function of the script is
        supposed to remove files from the defined temporary directories of the
        system as specified in /etc/rc.config (TMP_DIRS_TO_CLEAR in
        /etc/rc.config) if $CLEAR_TMP_DIRS_AT_BOOTUP (also from /etc/rc.config)
        is set to "yes". Unfortunately, the script does not take into account
        that directories can contain newlines and other non-standard characters.
        By consequence, the script can be tricked to removing files elsewhere.
        This bug is present in the SuSE Linux 7.2 version only, available for the
        Intel i386 platform. The feature responsible for this bug is disabled
        by default in a SuSE Linux 7.2 installation and must be manually
        activated for the bug to impose any risk.
        We have fixed the problem in an update package that is available at
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/a1/aaa_base-2001.8.23-0.i386.rpm
        Please download and install the update package using the command
            rpm -Uhv aaa_base-2001.8.23-0.i386.rpm
        Disregard the messages on standard output if you have the gpg package
        installed: The postinstall script adds the DSA key This email address is being protected from spambots. You need JavaScript enabled to view it.
        to root's gpg public keyring if this hasn't been done already. This
        key is also listed below.
        A source rpm is also available at the usual location.
        We will not issue a dedicated security announcement for this problem.
        We thank Bob Vickers for reporting the problem to This email address is being protected from spambots. You need JavaScript enabled to view it..
    
    
      - openssl
        A weakness was found in the PRNG (Pseudo Random Number Generator) of
        the openssl package. As far as we could determine, the bug has no
        effect on the packages that are compiled against a library from the
        openssl package. We will however provide update packages that fix
        the found problems. Since openssl packages are not (backwards-)
        compatible to any other newer version, we have to fix the package for
        each distribution seperately. This takes some time. A special announce-
        ment will be issued as soon as all packages are available.
    
    
      - more announcements are in our queue. Please keep watching activity on
        the This email address is being protected from spambots. You need JavaScript enabled to view it. mailinglist (more information below).
    
    ______________________________________________________________________________
    
    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 uninstalled 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 toplevel 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 annoucements 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.>.
        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 cleartext signature shows proof of the
        authenticity of the text.
        SuSE GmbH 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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    [{"id":"87","title":"Excellent, don't change a thing!","votes":"64","type":"x","order":"1","pct":57.14,"resources":[]},{"id":"88","title":"Should be more technical","votes":"15","type":"x","order":"2","pct":13.39,"resources":[]},{"id":"89","title":"Should include more HOWTOs","votes":"33","type":"x","order":"3","pct":29.46,"resources":[]}]["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"]["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"]350
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