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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                dhcp/dhcp-server
        Announcement-ID:        SuSE-SA:2004:019
        Date:                   Tuesday, Jun 22st 2004 21:00 MEST
        Affected products:      8.0, 8.1, 8.2, 9.0, 9.1
                                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 system compromise
        Severity (1-10):        5
        SUSE default package:   yes
        Cross References:       VU#317350
                                VU#654390

    Content of this advisory:
        1) security vulnerability resolved: buffer overflow
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
             - icecast
             - sitecopy
             - cadaver
             - OpenOffice_org
             - tripwire
             - postgresql
             - lha
             - XDM
             - mod_proxy
        3) standard appendix (further information)

______________________________________________________________________________

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

    The Dynamic Host Configuration Protocol (DHCP) server is used to
    configure clients that dynamically connect to a network (WLAN
    hotspots, customer networks, ...).
    The CERT informed us about a buffer overflow in the logging code of the
    server that can be triggered by a malicious client by supplying multiple
    hostnames. The hostname strings are concatenated and copied in a
    fixed size buffer without checking the buffer bounds.
    Other possible buffer overflow conditions exist in using vsprintf()
    instead of vsnprintf(). This behavior can be configured during compile-
    time. The dhcp/dhcp-server package coming with SUSE LINUX used the
    vulnerable vsprintf() function.

    Since SuSE Linux 8.1/SuSE Linux Enterprise Server 8 the DHCP server runs
    as non-root user in a chroot jail. This setup limits the impact of a
    successful attack.

    There is no temporary workaround known.

    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.

    x86 Platform:

    SUSE Linux 9.1:
          6de5ea6efc87a3fcd3ed0ad6b9500a72
    patch rpm(s):
          e64d5f02268edf0cd4ecac5e917c2872
    source rpm(s):
          6be43d62ac4987c21d37bbfaf474d604

    SUSE Linux 9.0:
          617270aba8651abb59a492bfe9b60018
    patch rpm(s):
          4a90fa43709f38a2c6b3dbcf591a0adb
    source rpm(s):
          ac606c8da1f8f4eae538ea110c639432

    SUSE Linux 8.2:
          28020cc4c5d8a57cf5da5fbb1fcb682c
    patch rpm(s):
          425546108271103762940ee6407ee03c
    source rpm(s):
          a0a1ef9fbc13ac94bd9371eea33a6113

    SUSE Linux 8.1:
          77ecf5ffef83bcf36636c1330bdfc4be
    patch rpm(s):
          d505bd9f0787eb1dca75a4b6908d1ce9
    source rpm(s):
          877b2bc5e21ad6f4e30968df29cb7c7e

    SUSE Linux 8.0:
          efad137cb0835d11f789a0a41de88c85
    patch rpm(s):
          68d11afae967685d18ed9e4864c29972
    source rpm(s):
          ae3bfa6b54b824a1283b9acd6b354410



    x86-64 Platform:

    SUSE Linux 9.1:
          e0dce22d7d0a67b22e7ee144761ab56d
    patch rpm(s):
          9a14ca99e4284e3d91bd7d5e904c1714
    source rpm(s):
          e7e668a18dff093d7d53f3b5c5ce6a03

    SUSE Linux 9.0:
          d054492651ea0fc968d537540e16cb5b
    patch rpm(s):
          d073e74b3fe9150108aaf37ab1e2135f
    source rpm(s):
          b5702a32cb1caad2f8d711a5e88bd97e

______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    - icecast
    The icecast service is vulnerable to a remote denial-of-service
    attack. Update packages will be available soon.

    - sitecopy
    The sitecopy package includes a vulnerable version of the
    neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be
    available soon.

    - cadaver
    The cadaver package includes a vulnerable version of the
    neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be
    available soon.

    - OpenOffice_org
    The OpenOffice_org package includes a vulnerable version
    of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages
    will be available soon.

    - tripwire
    A format string bug in tripwire can be exploited locally
    to gain root permissions. Update packages will be available soon.

    - postgresql
    A buffer overflow in psqlODBC could be exploited to crash the
    application using it. E.g. a PHP script that uses ODBC to access a
    PostgreSQL database can be utilized to crash the surrounding Apache
    web-server. Other parts of PostgreSQL are not affected.
    Update packages will be available soon.

    - lha
    Minor security fix for a buffer overflow while handling command
    line options. This buffer overflow could be exploited in conjunction
    with other mechanisms to gain higher privileges or access the system
    remotely.
    Packages are available now.

    - XDM/XFree86
    This update resolves random listening to ports by XDM
    that allows to connect via the XDMCP. SUSE LINUX 9.1
    is affected only.
    New packages are currently being tested and will be
    available soon.

    - mod_proxy
    A buffer overflow can be triggered by malicious remote
    servers that return a negative Content-Length value.
    This vulnerability can be used to execute commands remotely
    New packages are currently being tested and 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 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  .


  - 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.
    ====================================================================