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SuSE Security Announcement: htdig

Oct 24, 2001, 16:44 (0 Talkback[s])
Date: Wed, 24 Oct 2001 12:17:52 +0200 (CEST)
From: Thomas Biege 
To: suse-security-announce@suse.com

____________________________________________________________________________

                             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 feedback@suse.de.

  - 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 ftp.suse.de,
    all other packages can be found on ftp 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 <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 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 <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 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 "build@suse.de" 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:

    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 annoucements 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.
    The security@suse.com 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 <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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Bye,
     Thomas
-- 
  Thomas Biege, SuSE GmbH, Schanzaeckerstr. 10, 90443 Nuernberg
  E@mail: thomas@suse.de      Function: Security Support & Auditing
  "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
  Key fingerprint = 51 AD B9 C7 34 FC F2 54  01 4A 1C D4 66 64 09 84