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              AUSCERT External Security Bulletin Redistribution
                                      
                                      
                      ESB-98.077 -- CIAC Bulletin I-053
                     ISC DHCP Distribution Vulnerability
                                22nd May 1998

===========================================================================

The U.S. Department of Energy Computer Incident Advisory Capability has
released the following advisory concerning two vulnerabilities in the
Internet Software Consortium DHCP Distribution.  These vulnerabilities
may allow remote users to crash the DHCP server.

The following security bulletin is provided as a service to AusCERT's
members.  As AusCERT did not write this document, AusCERT has had no
control over its content.  As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It will
not be updated when the original bulletin is.  If downloading at a later
date, it is recommended that the bulletin is retrieved from the original
authors to ensure that the information is still current.

Contact information for CIAC is included in the Security Bulletin below.
If you have any questions or need further information, please contact them
directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.


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             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_   /
                          \___  __|__  /     \___
             __________________________________________________________

                             INFORMATION BULLETIN

                      ISC DHCP Distribution Vulnerability

May 20, 1998 16:00 GMT                                            Number I-053
______________________________________________________________________________
PROBLEM:       There are two bugs in all previous releases of the Internet
               Software Consortium DHCP Distribution.
DAMAGE:        By exploiting this vulnerability, remote users may crash the
               DHCP server.
SOLUTION:      Perform the recommended upgrades detailed in this advisory.
______________________________________________________________________________
VULNERABILITY  Exploit information involving this vulnerability has not yet
ASSESSMENT:    been made publicly available.
______________________________________________________________________________

[  Start ISC Advisory  ]

There are two bugs in all previous releases of the Internet Software
Consortium DHCP Distribution which can be exploited to crash the DHCP
server, or possibly worse.  I have prepared new distributions of
version 1.0 and 2.0 of the DHCP Distribution which correct these
problems.

Patches and for and new distributions of version 1.0 and version 2.0
are available at:

        ftp://ftp.isc.org/isc/dhcp/dhcp-1.0.0-1.0pl1.diff.gz
        ftp://ftp.isc.org/isc/dhcp/dhcp-2.0b1pl0-2.0b1pl1.diff.gz
        ftp://ftp.isc.org/isc/dhcp/dhcp-1.0pl1.tar.gz
        ftp://ftp.isc.org/isc/dhcp/dhcp-2.0b1pl1.tar.gz

[  End ISC Advisory  ]
______________________________________________________________________________

CIAC wishes to acknowledge the contributions of the Internet Software
Consortium for the information contained in this bulletin.
______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
    Voice:    +1 925-422-8193
    FAX:      +1 925-423-8002
    STU-III:  +1 925-423-2604
    E-mail:   ciac@llnl.gov

For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 925-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:      http://www.ciac.org/
                        (or http://ciac.llnl.gov -- they're the same machine)
   Anonymous FTP:       ftp.ciac.org
                        (or ciac.llnl.gov -- they're the same machine)
   Modem access:        +1 (925) 423-4753 (28.8K baud)
                        +1 (925) 423-3331 (28.8K baud)

CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
   information and Bulletins, important computer security information;
2. SPI-ANNOUNCE for official news about Security Profile Inspector
   (SPI) software updates, new features, distribution and
   availability;
3. SPI-NOTES, for discussion of problems and solutions regarding the
   use of SPI products.

Our mailing lists are managed by a public domain software package
called Majordomo, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
ciac-bulletin, spi-announce OR spi-notes for list-name:

E-mail to       ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov:
        subscribe list-name
  e.g., subscribe ciac-bulletin

You will receive an acknowledgment email immediately with a confirmation
that you will need to mail back to the addresses above, as per the
instructions in the email.  This is a partial protection to make sure
you are really the one who asked to be signed up for the list in question.

If you include the word 'help' in the body of an email to the above address,
it will also send back an information file on how to subscribe/unsubscribe,
get past issues of CIAC bulletins via email, etc.

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.

LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)

I-043: SGI IRIX mailcap Vulnerability
I-044: BIND Vulnerabilities
I-045: SGI IRIX LicenseManager(1M) Vulnerabilities
I-046: Open Group xterm and Xaw Library Vulnerabilities
I-047: HP-UX OpenMail Vulnerability
I-048: SunOS mountd Vulnerability
I-049: SunOS ufsrestore Vulnerability
I-050: Digital UNIX Softlinks - advfs Vulnerability
I-051: FreeBSD T/TCP Vulnerability
I-052: 3Com® CoreBuilder and SuperStack II LAN Vulnerabilities



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