[security bulletin] SSRT4884 rev.0 - HP-UX TCP/IP Remote Denial of Service (DoS)

From: Boren, Rich (SSRT) (rich.boren_at_hp.com)
Date: 05/26/05

  • Next message: Boren, Rich (SSRT): "[security bulletin] SSRT5954 rev.1 - HP-UX TCP/IP Remote Denial of Service (DoS)"
    Date: Thu, 26 May 2005 11:08:50 -0600
    To: <bugtraq@securityfocus.com>
    
    

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    HP SECURITY BULLETIN

    HPSBUX01164 REVISION: 0

    SSRT4884 rev.0 - HP-UX TCP/IP Remote Denial of Service (DoS)

    NOTICE:
    There are no restrictions for distribution of this Security
    Bulletin provided that it remains complete and intact.

    The information in this Security Bulletin should be acted upon
    as soon as possible.

    INITIAL RELEASE:
    25 May 2005

    POTENTIAL SECURITY IMPACT:
    Remote Denial of Service (DoS)

    SOURCE:
    Hewlett-Packard Company
    HP Software Security Response Team

    VULNERABILITY SUMMARY:
    A potential security vulnerability has been identified with HP-UX
    running TCP/IP. This vulnerability could be remotely exploited by
    an unauthorized user to cause a Denial of Service(DoS).

    REFERENCES:
    NISCC 532967, CAN-2004-0790, CAN-2004-0791

    SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
    HP-UX B.11.00, B.11.04, B.11.11, B.11.22, B.11.23
    running TCP/IP.

    BACKGROUND:

         AFFECTED VERSIONS

         HP-UX B.11.22
         HP-UX B.11.04
         HP-UX B.11.00
         =============
         action: set ip_pmtu_strategy = 0, block certain ICMP messages

         HP-UX B.11.23
         =============
         Networking.NET2-KRN
         action: install preliminary binary files

         IPSec.IPSEC2-KRN
         action: set ip_pmtu_strategy = 0

         HP-UX B.11.11
         =============
         Networking.NET2-KRN
         action: install preliminary binary files

         IPSec.IPSEC2-KRN
         action: set ip_pmtu_strategy = 0

         END AFFECTED VERSIONS

    RESOLUTION:
    As reported in NISCC VU#532967
    http://www.uniras.gov.uk/niscc/docs/al-20050412-00308.html?lang=en
     ICMP messages may be used to attack TCP/IP connections.

    Preliminary binary files are available for B.11.11 and B.11.23.
    Instructions for downloading and installing the binary files are
    given below.

    Workarounds
    ========

    Until patches are available the issue may be worked around by
    filtering out certain ICMP messages and by ignoring the
    "Fragmentation Needed and DF Bit Set" ICMP message.

    The following ICMP messages could be filtered via filtering
    technology such as firewalls or host based filters:

      Protocol Unreachable
      Port Unreachable
      Source Quench

    Note: Filtering "Protocol Unreachable" and "Port Unreachable"
    should not be done without careful testing. Filtering these out
    may interfere with the correct functioning of network components.
    Filtering "Source Quench" should present little risk.

    In addition the "Fragmentation Needed and DF Bit Set" ICMP message
    can be ignored by setting ip_pmtu_strategy = 0 as follows:

    Note: HPSBUX01137 recommends setting ip_pmtu_strategy = 0 or 3 as
    a workaround. The current issue has a different root cause and
    cannot be worked around with ip_pmtu_strategy = 3.

    Setting ip_pmtu_strategy=0
    ==================
    Edit /etc/rc.config.d/nddconf to add the following:

    TRANSPORT_NAME[n]=ip
    NDD_NAME[n]=ip_pmtu_strategy
    NDD_VALUE[n]=0

    This value will take effect when the system is rebooted.
    Until the system can be rebooted the ip_pmtu_strategy value for
    new connections can be set with the ndd(1M) command:

      /usr/bin/ndd -set /dev/ip ip_pmtu_strategy 0

    Note: There is a defect that will cause "ndd -c" to fail if there
    are more than 10 directives in /etc/rc.config.d/nddconf. That
    defect is fixed in the following patches:

                  B.11.11 - PHNE_25644 or subsequent
                  B.11.04 - PHNE_26076 or subsequent
                  B.11.00 - PHNE_26125 or subsequent

    Preliminary binary files
    ==============

    Preliminary binary files are available for B.11.11 and B.11.23.
    Instructions for downloading and installing the binary files are
    contained in readme files available here:

         System: hprc.external.hp.com (192.170.19.51)
         Login: icmp
         Password: icmp

        FTP Access: ftp://icmp:icmp@hprc.external.hp.com/
                or: ftp://icmp:icmp@192.170.19.51/

    Download the appropriate readme file containing further
    instructions:

       readme.11.11.txt
       readme.11.23.txt

    Verify the cksum or md5sum:

       cksum readme*
      4156903999 3555 readme.11.11.txt
      2827648934 3676 readme.11.23.txt

       md5sum readme*
      3926e5970fe50872cfa2f1998355f25c readme.11.11.txt
      41d45bcc312dee4ef297a4438e37b81c readme.11.23.txt

    Download and install the binary files as discussed in the readme
    files. The binary files are available in the same directory as
    the readme files.

    IPSec
    ====
    Customers using the IPSec product may install the binary files for
    B.11.11 and B.11.23 as mentioned above. However, that will not
    resolve all the issues for IPSec. Until a binary file is
    available for the IPSec product it will be necessary to use the
    ip_pmtu_strategy = 0 workaround as discussed above.

    In summary:
    B.11.11,B.11.23 -- install binary files
    B.11.11,B.11.23 plus IPSec -- install binary files and
                                  set ip_pmtu_strategy = 0

    MANUAL ACTIONS: Yes - NonUpdate

    For B.11.00, B.11.04, and B.11.22:
    Set ip_pmtu_strategy=0 and filter out the following ICMP messages:

      Protocol Unreachable
      Port Unreachable
      Source Quench

    For B.11.11 and B.11.23:
    Apply the workaround above or install binary files.

    For B.11.11 and B.11.23 IPSec:
    In addition to installing binary files, set ip_pmtu_strategy=0.

    BULLETIN REVISION HISTORY:
    Revision 0: 25 May 2005
      Initial release

    HP-UX SPECIFIC SECURITY BULLETINS*: Security Patch Check revision
    B.02.00 analyzes all HP-issued Security Bulletins to provide a
    subset of recommended actions that potentially affect a specific
    HP-UX system.

    For more information:
    http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
    displayProductInfo.pl?productNumber=B6834AA

    SUPPORT: For further information, contact normal HP Services
    support channel.

    REPORT: To report a potential security vulnerability with any HP
    supported product, send Email to: security-alert@hp.com. It is
    strongly recommended that security related information being
    communicated to HP be encrypted using PGP, especially exploit
    information. To obtain the security-alert PGP key please send an
    e-mail message to security-alert@hp.com with the Subject of
    'get key' (no quotes).

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    http://h30046.www3.hp.com/driverAlertProfile.php?regioncode=NA&
    langcode=USENG&jumpid=in_SC-GEN__driverITRC&topiccode=ITRC

    On the web page: ITRC security bulletins and patch sign-up
    Under Step1: your IRTC security bulletins and patches
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    Under Step2: your IRTC operating systems
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    To review previously published Security Bulletins visit:
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    * The Software Product Category that this Security Bulletin
      relates to is represented by the 5th and 6th characters of the
      Bulletin number:
        GN = HP General SW,
        MA = HP Management Agents,
        MI = Misc. 3rd party SW,
        MP = HP MPE/iX,
        NS = HP NonStop Servers,
        OV = HP OpenVMS,
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        TU = HP Tru64 UNIX,
        UX = HP-UX,
        VV = HP Virtual Vault

    System management and security procedures must be reviewed
    frequently to maintain system integrity. HP is continually
    reviewing and enhancing the security features of software products
    to provide customers with current secure solutions.

    "HP is broadly distributing this Security Bulletin in order to
    bring to the attention of users of the affected HP products the
    important security information contained in this Bulletin. HP
    recommends that all users determine the applicability of this
    information to their individual situations and take appropriate
    action. HP does not warrant that this information is necessarily
    accurate or complete for all user situations and, consequently, HP
    will not be responsible for any damages resulting from user's use
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    extent permitted by law, HP disclaims all warranties, either
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    (c)Copyright 2005 Hewlett-Packard Development Company, L.P.
    Hewlett-Packard Company shall not be liable for technical or
    editorial errors or omissions contained herein. The information
    provided is provided "as is" without warranty of any kind. To the
    extent permitted by law, neither HP nor its affiliates,
    subcontractors or suppliers will be liable for incidental, special
    or consequential damages including downtime cost; lost profits;
    damages relating to the procurement of substitute products or
    services; or damages for loss of data, or software restoration.
    The information in this document is subject to change without
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    Company in the United States and other countries. Other product
    and company names mentioned herein may be trademarks of their
    respective owners.

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