SuSE Security Announcement: dhcp (SuSE-SA:2003:0006)

20 Jan 2003


      -----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                dhcp
        Announcement-ID:        SuSE-SA:2003:0006
        Date:                   Monday, Jan 20th 2003 16:30 MET
        Affected products:      7.1, 7.2, 7.3, 8.0, 8.1
                                SuSE Linux Database Server
                                SuSE eMail Server 3.1
                                SuSE eMail Server III
                                SuSE Linux Enterprise Server
                                SuSE Linux Connectivity Server
                                SuSE Linux Office Server
        Vulnerability Type:     remote system compromise
        Severity (1-10):        4
        SuSE default package:   no
        Cross References:

    Content of this advisory:
        1) security vulnerability resolved: buffer overflow in nsupdate code
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - fam
            - xpdf
            - libmcrypt
            - gfxboot
            - mod_php4
            - wget
            - IMP
        3) standard appendix (further information)

______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    The ISC (Internet Software Consortium) dhcp package is an imple-
    mentation of the "Dynamic Host Configuration Protocol" (DHCP).
    An internal source code audit done by ISC revealed several buffer
    overflows in the code which is responsible to handle dynamic DNS
    requests.
    These bugs allow an attacker to gain remote access to the dhcp
    server if the dynamic DNS feature is enabled.
    Dynamic DNS is not enabled by default on SuSE Linux.

    As temporary fix you can disable dynamic DNS support and restart your
    dhcp server. Otherwise install the new packages from our FTP servers.

    Please backup your lease file before updating the package.
    After the package update you have to restart the dhcp server
    This can be done by executing the following commands as root:
      - rcdhcpd restart
    or (for older versions):
      - rcdhcp restart

    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-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/dhcp-server-3.0.1rc9-59.i586.rpm
      b93512def1ff7a566af1c0d32698ae54
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/dhcp-server-3.0.1rc9-59.i586.patch.rpm
      4dba1190fed929dc732e5b714ec04c01
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/dhcp-3.0.1rc9-0.src.rpm
      e95be7ef7c465f5df89130f2b718ca2b

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-base-3.0.1rc6-15.i386.rpm
      04cf9fcc4f50b46b5acc17188b5731c4
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/dhcp-base-3.0.1rc6-15.i386.patch.rpm
      02ae79a92f6a906e6379fc9b844a2899
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/dhcp-3.0.1rc6-8.src.rpm
      f17c08af58e335c6bc428283df620e3b

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/dhcrelay-3.0rc12-56.i386.rpm
      f1433f875b45ee9d1ba4908fee76db26
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/dhcp-3.0rc12-56.src.rpm
      e2523ad5843801d2d4b6ddbc410deb7b

    SuSE-7.2:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/dhcp-devel-3.0rc4-32.i386.rpm
      9f0f42381ff5acb13f42777d47486f23
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/dhcp-3.0rc4-32.src.rpm
      15a2d5afbc0590d036b9d1c5604d8f5a

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/dhcpcd-1.3.19pl2-1.i386.rpm
      4bccb2397354916161ab24ab1055f514
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/dhcpcd-1.3.19pl2-1.src.rpm
      fa6bbd04a8510fdf874b17d4a6a38517


    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/dhcp-devel-3.0rc12-26.sparc.rpm
      3bdc8877b3ae483066ad59b58a2f6500
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/dhcp-3.0rc12-26.src.rpm
      821121c8b3aec15039e3e2ae2b352b0d


    AXP Alpha Platform:

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/dhcpcd-1.3.19pl6-0.alpha.rpm
      7ea88d937f39f3c8dc95c139a2925dae
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/dhcpcd-1.3.19pl6-0.src.rpm
      b7ec2409fb5f53df480cbe3dae0c5942

    SuSE-7.0:
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/dhcpcd-1.3.18p8-11.alpha.rpm
      a84bacf848a1a2da31ab6827c85017a2
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/dhcpcd-1.3.18p8-11.src.rpm
      d0bbe10ba9a362308b9a0caf4b5fa209


    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/dhcp-devel-3.0rc12-39.ppc.rpm
      191ca180aa1aa60f17d5321e2564ac32
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/dhcp-3.0rc12-39.src.rpm
      8eb0831beb4402992ef9385e22fa542c

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/dhcpcd-1.3.19pl2-1.ppc.rpm
      00fb6f92ffa1d66cab5792c032d4a713
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/dhcpcd-1.3.19pl2-1.src.rpm
      94067dccc6717b56d26a194f661ce2e5


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - fam
      SuSE Versions < 8.0 are shipping a vulnerable version of fam
      which allows unprivileged users to determine filenames of
      group root.
      New packages are available on our FTP servers.

    - xpdf
      An integer overflow in pdftops may lead to system compromise.
      New packages are available on our FTP servers..

    - libmcrypt
      Several buffer overflows in libmcrypt were discovered by Ilia
      Alshanetsky. The buffer overflows can lead to system compromise.
      New packages are currently being build.

    - gfxboot
      Since SuSE 8.1 the bootloader lilo is replaced by grub.
      Grub's password authentication can be bypassed.
      New packages will be released soon.

    - mod_php4
      A buffer overflow in the wordwrap() function has been reported.
      New packages will be prepared and should be available on our ftp
      servers soon.

    - wget
      A buffer overflow in wget's url_filename function was found.
      This buffer overflow can be triggered by long URLs.
      New packages are currently being build and will be released
      soon.

    - IMP
      The web front-end of IMP is vulnerable to a SQL injection attack.
      New packages are currently being build and will be released
      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 security@suse.de),
       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 "build@suse.de" 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:

    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-announce@suse.com
        -   SuSE's announce-only mailing list.
            Only SuSE's security announcements are sent to this list.
            To subscribe, send an email to
                .

    For general information or the frequently asked questions (faq)
    send mail to:
         or
         respectively.

    =====================================================================
    SuSE's security contact is  or .
    The  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 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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Bye,
     Thomas
-- 
  Thomas Biege 
  SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg
  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 83
-- 

  Over thinking, Over analyzing, seperates the body from the mind.
                                               - Maynard James Keenan