SuSE: 'samba' vulnerability

    Date29 Jun 2001
    CategorySuSE
    3161
    Posted ByLinuxSecurity Advisories
    Michal Zalewski discovered that a remote attacker can write to files owned by root if the samba config file /etc/smb.conf contains the %m macro to specify the logfile for logging access to the samba server.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                samba
            Announcement-ID:        SuSE-SA:2001:021
            Date:                   Friday, Jun 29th 2001 14:45 MEST
            Affected SuSE versions: (6.0, 6.1, 6.2) 6.3, 6.4, 7.0, 7.1, 7.2
            Vulnerability Type:     possible remote root compromise
            Severity (1-10):        7
            SuSE default package:   yes
            Other affected systems: systems using samba and the %m macro in the
                                    samba main config file
    
        Content of this advisory:
            1) security vulnerability resolved: samba
               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
    
        Michal Zalewski discovered that a remote attacker can write to files
        owned by root if the samba config file /etc/smb.conf contains the %m
        macro to specify the logfile for logging access to the samba server.
        The %m macro substitutes the NetBIOS name - improper validation of
        this name allows an attacker to write to any file in the system.
    
        SuSE Linux distributions do not ship a default /etc/smb.conf config
        file that contains the %m macro. Therefore, SuSE distributions are not
        vulnerable to the bug in the out-of-the-box state.
    
        In addition to the remotely exploitable bug, there exists another
        vulnerability which is fixed with the update packages we provide
        below: temporary files are being handled insecurely so that an
        attacker with local access to the system can increase her privileges.
        This error was discovered by Marcus Meissner, Caldera. This specific
        problem has been fixed with the release of the samba-2.0.9 version.
        samba release version 2.0.8 intended to correct this local problem, but
        due to an error, 2.0.9 contained the complete fix.
    
        Only the 2.0.10 version as offered for the SuSE Linux distributions
        6.3, 6.4, 7.0 and 7.1 fixes all known problems in the samba package.
        For the recently released SuSE-7.2 distribution we provide an update
        package to the version 2.2.0a.
    
        We thank Martin Walter, CC university of Freiburg, for his helpful
        contribution in debugging the Large File Support (LSF) of the 7.1
        package.
    
        NOTES:
        * We have removed the samba packages from the update trees for the 6.0,
        6.1 and 6.2 distributions on our ftp-server. These packages would
        introduce security risks if installed on a host.
        * The samba source rpm package in distributions after and including 7.0
        generates both the samba.rpm and the smbclnt.rpm package. It is
        recommended to update both packages for these distributions.
    
    
        Please download the update package from locations described below and
        check the authenticity of the rpm package file using a method as
        described in section 3 of this security announcement.
        Use the command 'rpm -Uhv file.rpm' to apply the update.
    
        Special installation instructions:
        ===================================
        After successful installation of the update package, it is necessary to
        restart the samba server. To do this, use the following command
            rcsmb restart
        as root.
    
    
        i386 Intel Platform:
    
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/samba-2.2.0a-0.i386.rpm
          d0cab6f5d34645dc9e41f2ae0aed8a30
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/smbclnt-2.2.0a-0.i386.rpm
          aba5da72a8175c2119e82d01184dd320
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/samba-2.2.0a-0.src.rpm
          243964fad8bda61039020acf7a13858f
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/samba-2.0.10-0.i386.rpm
          da1232db9259196a58e7e3b46065e8c8
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/smbclnt-2.0.10-0.i386.rpm
          a497089893fd375986ab5a031eddaf05
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/samba-2.0.10-0.src.rpm
          07705a9cacb7f9f28b434a1e6a6fe3bb
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/samba-2.0.10-0.i386.rpm
          a20a0241fad9b3381758946e9f9ae16d
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/smbclnt-2.0.10-0.i386.rpm
          c0194e29ff9f6ae5da8500f6a6250bab
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/samba-2.0.10-0.src.rpm
          e412b83bbf653023cadbf163a3ec296f
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/samba-2.0.10-0.i386.rpm
          e740834c08f1a91efed8abfe1ffd1fd1
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/samba-2.0.10-0.src.rpm
          ed22708ec5fbc14cfdfc0cd45b3033e0
    
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/samba-2.0.10-0.i386.rpm
          da6aeaf7043bc03199e4c1d5c04d3be6
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/samba-2.0.10-0.src.rpm
          84e325fc575143a576c42f386c88e44c
    
    
    
        Sparc Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/samba-2.0.10-0.sparc.rpm
          5b702a797836de3352c96b0b33297d13
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/smbclnt-2.0.10-0.sparc.rpm
          00c29e2ff26d00b60a81e095a78623c7
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/samba-2.0.10-0.src.rpm
          1d9d41cfeab79ef851cb4666a0259731
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/samba-2.0.10-0.sparc.rpm
          48ef896322723e4247b13db719a6d593
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/smbclnt-2.0.10-0.sparc.rpm
          fdacfbe34e46919515dc54d288b6e56a
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/samba-2.0.10-0.src.rpm
          b023db5df4e6b26ed8263d61de3c9915
    
    
    
    
        AXP Alpha Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/samba-2.0.10-0.alpha.rpm
          3302ca10f2e779ff168d44bc4280158a
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/smbclnt-2.0.10-0.alpha.rpm
          440ff9a0fefb54ac85977e4598e39eed
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/samba-2.0.10-0.src.rpm
          49f109c06957f200cd5112dc872273fc
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/samba-2.0.10-0.alpha.rpm
          6e68f4d9156238874755bd9bac59d713
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/smbclnt-2.0.10-0.alpha.rpm
          c1935910e75c956ed8b2ce9e4c324d55
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/samba-2.0.10-0.src.rpm
          210dde7e938ff7d1d303e80a13d11673
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/samba-2.0.10-0.alpha.rpm
          9d6cf089b447ba4aefe1d70cf2771a22
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/samba-2.0.10-0.src.rpm
          377b183857e179772481840caffd7db4
    
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/samba-2.0.10-0.alpha.rpm
          e4871d1a0423bec9999fde9a9b85ab23
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/samba-2.0.10-0.src.rpm
          51cf42a086a4a26619323311660dbfb8
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/samba-2.0.10-0.ppc.rpm
          dfaa395540e2e01b3ccc7177f0f297c4
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/smbclnt-2.0.10-0.ppc.rpm
          ca9059bfbafe4553ae6bc79dad70ce31
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/samba-2.0.10-0.src.rpm
          df603b78073673c7f8988639b1cb2c1e
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/samba-2.0.10-0.ppc.rpm
          65b2d0e71902afb4f3cafa67f2d5c628
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/smbclnt-2.0.10-0.ppc.rpm
          a1de2eb26df810831f65af2feb0f12f9
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/samba-2.0.10-0.src.rpm
          17777fa091391825ebd9d90018f950bf
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/samba-2.0.10-0.ppc.rpm
          4e44aaab59f3c624e77b83bbbc05bb18
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/samba-2.0.10-0.src.rpm
          5893c01a4f1ddf8f8d2e77ac8ee785e9
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
      - Location of update packages on ftp.suse.de/ftp.suse.com:
        Licensing problems as well as US crypto-software export regulations
        keep us from publishing update packages that contain cryptographical
        software on ftp.suse.com, our US ftp server. Bandwith requirements
        keep us from moving the server to our German location. For these
        reasons, crypto-packages for SuSE Linux distributions before SuSE-7.1
        can be obtained from the equivalent tree on ftp.suse.de. Distributions
        after and including SuSE-7.1 have their crypto-packages hosted on
        ftp.suse.com. This was possible with some efforts to remove all non-free
        cryptographical algorithms from our packages.
    
    
      - qpopper
        In our last security announcement (SuSE-SA:2001:020 gpg/gnupg) we
        announced that we investigate the buffer overflow that has been found
        in qpopper versions before 4.0.3. SuSE Linux distributions are not
        affected by this bug because a different version is being used.
    
    
      - dqs
        This email address is being protected from spambots. You need JavaScript enabled to view it.
    	 has found an exploitable buffer overflow bug in
        the dsh program from the dqs package on SuSE Linux distributions.
        To workaround the problem, do "chmod -s /usr/bin/dsh" and change the
        files /etc/permissions* to reflect the change. If you do not need the
        dqs package, then deinstall it (rpm -e dqs).
        Packages for most of the supported SuSE Linux distributions are
        available at the usual location  ftp://ftp.suse.com/pub/suse//
        for download and installation/update. Do not forget to change the files
        /etc/permissions* to remove the suid-bit from the dsh program. Please
        note that we will not issue a dedicated security announcement for this
        specific bug.
    
    
      - pcp
        Paul Starzetz discovered a security weakness in the setuid root program
        /usr/share/pcp/bin/pmpost. The common library in pcp trusts the
        environment that has been supplied by the user, regardless of privileged
        execution or not. By consequence, a user can specify the configuration
        file and therefore write to files owned by root. The problem is not based
        on insecurely following symlinks as stated by Paul Starzetz.
        The pcp package is not installed by default in SuSE Linux distributions.
        We have provided update packages for the SuSE Linux distributions version
        7.1 and 7.2 that remove the setuid bit from the pmpost binary. Versions
        before SuSE-7.1 were not affected because the setuid bit was not set.
        We thank Keith Owens and Mark Goodwin from Silicon Graphics for responding
        quickly and for publishing a new version of the pcp package which will
        be included in future releases of the SuSE Linux distribution. For more
        information see the /usr/share/doc/packages/pcp directory of your SuSE
        Linux installation after installing the update package, or go to
        obtained from  http://oss.sgi.com/projects/pcp/download .
        Please note that there will not be a dedicated security announcement
        for this specific bug.
    
    
      - xinetd
        A buffer overflow has been found in xinetd, all versions, all
        SuSE Linux distributions. It may be abused to remotely attack a host
        running xinetd. The xinetd package is not installed by default in SuSE
        Linux distributions. Manual interaction must have been applied to run
        the daemon.
        Update packages can be found at the usual location on our ftp server.
        The security announcement for this security problem is underway.
    
    
      - fetchmail (fetchml)
        New fetchmail packages are available on the ftp server. The packages
        cure a buffer overflow that can be exploited by sending a victim a
        specially designed email, waiting for the victim's fetchmail program
        to pick up the email. We are preparing a security announcement for this
        problem.
    
    
      - openssh
        update packages for the openssh package after (and including) SuSE-6.4
        are available on our ftp servers ftp.suse.de (for < 7.1) or
        ftp.suse.com (for >= 7.1). We are currently checking for a non-security
        related irregularity in sshd's behaviour under faulty setup conditions.
    
    
      - exim
        SuSE Linux distributions do not contain the exim Mail Transport Agent
        (See  http://www.exim.org/ for details) and are therefore not susceptible
        to the recently found security-related bugs.
    
    
      - webmin
        SuSE Linux distributions do not contain the webmin administration
        web frontend (See  http://www.webmin.org/ for details) and are therefore
        not vulnerable to the recently found security-related problems in the
        software.
    
    ______________________________________________________________________________
    
    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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    Version: GnuPG v1.0.6 (GNU/Linux)
    Comment: For info see  http://www.gnupg.org
    
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