SuSE: 'pam_smb' privilege escalation

    Date05 Sep 2003
    CategorySuSE
    2164
    Posted ByLinuxSecurity Advisories
    Dave Airlie informed us about a bug in the authentication code of pam_smb that allows a remote attacker to gain access to a system using pam_smb by issuing a too long password string.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                pam_smb
            Announcement-ID:        SuSE-SA:2003:036
            Date:                   Wednesday, Sep 3nd 2003 16:40 MEST
            Affected products:      7.2, 7.3, 8.0, 8.1, 8.2
                                    SuSE Linux Database Server,
                                    SuSE eMail Server III, 3.1
                                    SuSE Linux Enterprise Server 7, 8
                                    SuSE Linux Firewall on CD/Admin host
                                    SuSE Linux Connectivity Server
                                    SuSE Linux Office Server
            Vulnerability Type:     remote privilege escalation
            Severity (1-10):        6
            SuSE default package:   no
            Cross References:
    
        Content of this advisory:
            1) security vulnerability resolved: buffer overflow
               problem description, discussion, solution and upgrade information
            2) pending vulnerabilities, solutions, workarounds:
                - gdm2
                - whois
                - node
                - postgresql
                - gkrellm
            3) standard appendix (further information)
    
    ______________________________________________________________________________
    
    1)  problem description, brief discussion, solution, upgrade information
    
        The PAM module (and server) pam_smb allows users of Linux systems to
        be authenticated by querying an NT server.
        Dave Airlie <This email address is being protected from spambots. You need JavaScript enabled to view it.> informed us about a bug in the
        authentication code of pam_smb that allows a remote attacker to gain
        access to a system using pam_smb by issuing a too long password string.
    
        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.
    
    
    
        Intel i386 Platform:
    
        SuSE-8.2:
         ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/pam_smb-1.1.6-501.i586.rpm
          77b933d95963020022c0b8ec426b1b33
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/pam_smb-1.1.6-501.i586.patch.rpm
          be26f459b855e0eb8a7aeb048966aff2
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/pam_smb-1.1.6-501.src.rpm
          f533ca1293f8a70db9d5ad2cc1aca1eb
    
        SuSE-8.1:
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/pam_smb-1.1.6-500.i586.rpm
          b12d1f7897319eabaccd3241c40a022a
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/pam_smb-1.1.6-500.i586.patch.rpm
          7bac2fa8229633f5329e51cc4474514f
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/pam_smb-1.1.6-500.src.rpm
          84a8f0156950582354832d9850964829
    
        SuSE-8.0:
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/pam_smb-1.1.6-500.i386.rpm
          d340b5e40b5a70ba91613c6328995b32
        patch rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/pam_smb-1.1.6-500.i386.patch.rpm
          f60ff0bb02f6e5d0346db13075cb819a
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/pam_smb-1.1.6-500.src.rpm
          1bbd9e875b5952dedfe2b5a0754e5619
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/pam_smb-1.1.6-501.i386.rpm
          7223b46ae84c85e343c9ebbf1b7d93fc
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/pam_smb-1.1.6-501.src.rpm
          d98153d86906f0c658fc076c4e7bc2e3
    
        SuSE-7.2:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/pam_smb-1.1.6-500.i386.rpm
          5e13b0856e21bdfcf5f6b7bd3da6aced
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/pam_smb-1.1.6-500.src.rpm
          21a70e45e84f518f33c0180d145b922f
    
    
    
    
        Sparc Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/pam_smb-1.1.6-147.sparc.rpm
          c6d8dc37b190d80d198565391455547a
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/pam_smb-1.1.6-147.src.rpm
          da99ca714612b897b035477aaae5b600
    
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.3:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/pam_smb-1.1.6-328.ppc.rpm
          0287905509e5d134ff9cd07be7aad701
        source rpm(s):
         ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/pam_smb-1.1.6-328.src.rpm
          55659805dada2721d5d0f5598e3ede27
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - gdm2
          Due to a bug in GDM it is possible for local users to read any text
          file on a system by creating a symlink from ~/.xsession-errors.
          Updated packages will be available on our FTP servers soon.
    
        - whois
          The client tool whois is vulnerable to several buffer overflows
          while processing its command-line arguments. In conjunction with using
          untrusted data from remote sources as input, like using whois in a CGI
          script and so on, this buffer overflows may be abused to compromise
          a system.
          New whois packages are built and will be released at the usual
          locations as soon as quality assurance is passed.
    
        - node
          The simple hamradio front-end node is vulnerable to buffer overflows
          and format-string bugs.
          New packages will be available soon.
    
        - postgresql
          The SQL database server postgresql of version 7.3.x prior 7.3.4 is
          vulnerable to buffer overflow attacks.
          New packages will be available soon.
    
        - gkrellm
          The server component of the gkrellm monitoring package is
          vulnerable to a buffer overflow.
          News 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 
           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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