SuSE: 'htdig' local privilege escalation vulnerability

    Date24 Oct 2001
    CategorySuSE
    2575
    Posted ByLinuxSecurity Advisories
    Due to insufficient checking of the running environment it is possible to use commandline options via CGI. An remote attacker could use the -c option to specify /dev/zero as an alternate config file to causes a denial of service for some minutes.
    
    ______________________________________________________________________________
    
                                 SuSE Security Announcement
    
            Package:                htdig
            Announcement-ID:        SuSE-SA:2001:035
            Date:                   Wednesday, October 24th 2001 09:30 MEST
            Affected SuSE versions: 6.3, 6.4, 7.0, 7.1, 7.2, 7.3
            Vulnerability Type:     local privilege escalation, remote DoS
            Severity (1-10):        3
            SuSE default package:   no
            Other affected systems: all linux-like operating-systems running
                                    htdig's htsearch via CGI
    
            Content of this advisory:
            1) security vulnerability resolved:  htsearch
               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
    
      ht://Dig is a powerfull indexing and information gathering tool for the
      web. ht://Dig's search engine htsearch could be run by a http server
      as CGI program or standalone as commandline tool.
      Due to insufficient checking of the running environment it is possible
      to use commandline options via CGI. An remote attacker could use the -c
      option to specify /dev/zero as an alternate config file to causes a
      denial of service for some minutes.
      To read files with the privilege of the http server by abusing the -c
      option an attacker needs write access to the server running htsearch.
    
      A temporary fix or workaround does not exist; we recommend to update
      your system with the new RPM from our FTP server.
    
      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 -Uhv file.rpm" to apply
      the update.
    
    
    
      i386 Intel Platform:
    
      SuSE-7.3
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/htdig-3.1.5-304.i386.rpm
          543b0668bbbe3c35a7b7f4aab523a497
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/htdig-3.1.5-304.src.rpm
          553ca93fb20eaa4a0d9dcf140d2a1cc3
    
      SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/htdig-3.1.5-304.i386.rpm
          70f7263f6b03d67858e14b6caf7716a3
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/htdig-3.1.5-304.src.rpm
          8853a7c1094450642d0c8eafcd7db612
    
      SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/htdig-3.1.5-304.i386.rpm
          934907ab6b8c1394446d3272122b6ba4
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/htdig-3.1.5-304.src.rpm
          04b7f1552aa7c2c31dd796e5db5db610
    
      SuSE-7.0
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n2/htdig-3.1.5-304.i386.rpm
          5eb6e0f2cd8c92f9d27c983cfa61c0cd
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/htdig-3.1.5-304.src.rpm
          33b6e71c0cba4b2e9faa0426f1a9c27c
    
      SuSE-6.4
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/n2/htdig-3.1.5-304.i386.rpm
          e65d6a8f096762617ea1b271b1ec1582
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/htdig-3.1.5-304.src.rpm
          ced955e563db7c4e422659228adbef58
    
      SuSE-6.3
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/n2/htdig-3.1.5-304.i386.rpm
          b2cd121f8f71064f79fb9d5d969b3d21
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/htdig-3.1.5-304.src.rpm
          3910e17d54392f755325960d1c2a9a13
    
    
    
      Sparc Platform:
    
      SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/htdig-3.1.5-212.sparc.rpm
          1a4e2643d776360178eea8d1d23f4fab
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/htdig-3.1.5-212.src.rpm
          66535cba934ecfce550ad60cadccad4d
    
      SuSE-7.0
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n2/htdig-3.1.5-212.sparc.rpm
          72ea40099742b87151146d3159b46d9f
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/htdig-3.1.5-212.src.rpm
          3de8701655664c84fb3a2c98ec857fca
    
    
    
      AXP Alpha Platform:
    
      SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/htdig-3.1.5-177.alpha.rpm
          23233fc040bbb7b7b8e9386e974257e9
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/htdig-3.1.5-177.src.rpm
          d7362ba99853fe56eb57b5ab71c1b11e
    
      SuSE-7.0
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/n2/htdig-3.1.5-177.alpha.rpm
          5549cf04c28bd2436f259c22fabd23f3
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/htdig-3.1.5-177.src.rpm
          ef269335b80344c7e4c9167865c432e4
    
      SuSE-6.4
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/n2/htdig-3.1.5-177.alpha.rpm
          5ff4ae9cb1845b0d416fe4fee2caf26a
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/htdig-3.1.5-177.src.rpm
          ec966adf8722dcf0eefe94356a1b4d9e
    
      SuSE-6.3
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/n2/htdig-3.1.5-177.alpha.rpm
          ec84394421f9480d13746f8c5ba7416c
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/htdig-3.1.5-177.src.rpm
          1f11551d794bcc08f3574af57c6fc2e3
    
    
    
      PPC PowerPC Platform:
    
      SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/htdig-3.1.5-209.ppc.rpm
          bb84003b547a0e80133da198de07c1cf
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/htdig-3.1.5-209.src.rpm
          93ad965154d8fe1b24ae15d0881966c8
    
      SuSE-7.0
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n2/htdig-3.1.5-208.ppc.rpm
          dbf2f686bc1bfaf4a59721157afdafb1
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/htdig-3.1.5-208.src.rpm
          70d360499c0bc89e2d90bcf2454e0867
    
      SuSE-6.4
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n2/htdig-3.1.5-208.ppc.rpm
          e9613bc7f5b28240f0aeece14059d976
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/htdig-3.1.5-208.src.rpm
          d4fb3b096ceb3b5cc7d42924a0952863
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
      - Linux kernel
        Security bugs have been found in both the 2.2 and 2.4 kernel series
        of all currently supported SuSE Linux distributions (6.3-7.3), including
        the freshly appeared SuSE-7.3. These bugs allow a local attacker to gain
        root privileges, but there is no remote attack as of now.
        As a temporary workaround, it is possible for experienced users of
        linux-like systems to disable all setuid bits from all files in the
        installed system using a find command with a -exec option.
    
        We are currently in the process of testing the update kernels of both
        2.2 (2.2.19) and 2.4 (2.4.13) series to make sure that these update
        kernels will have the same level of stability and robustness as expected
        from SuSE linux systems. The official kernel rpm packages will be
        announced in a SuSE Security announcement during the second half of
        this week. In the meanwhile, the directory
         ftp://ftp.suse.com/pub/people/mantel/next/ contains the preliminary
        update packages for testing (2.2.19 packages will be available shortly).
        Please proceed with the update as described in
         http://www.suse.de/de/support/security/2001_018_kernel_txt.txt
        and report any problems that you may find to This email address is being protected from spambots. You need JavaScript enabled to view it.
    	.
    
      - openssh
        After stabilizing the openssh package, updates for the distributions
        6.4-7.2 are currently being prepared. The update packages fix a security
        problem related to the recently discovered problems with source ip
        based access restrictions in a user's ~/.ssh/authorized_keys2 file.
        The packages will appear shortly on our ftp servers. Please note that
        packages for the distributions 6.3 and up including 7.0 containing
        cryptographic software are located on the German ftp server ftp.suse.de,
        all other packages can be found on ftp.suse.com at the usual location.
    
    
      Please continue to watch the suse-security-announce mailing list for
      new security announcements.
    
    
    ______________________________________________________________________________
    
    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 advise against subscribing to 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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