****************************************************************************** ------ ----- ----- --- ----- | ----- ---- | | | | | |--- | | | | | | | | | |-- | | | | |-- | | | | | | | | \ | | ----- ---- ----- ----- | \ ----- A D V I S O R Y FA-98.44 ****************************************************************************** Topic: ISC DHCP Distribution Vulnerability Source: CIAC Creation Date: May 20, 1998 Last Updated: To aid in the wide distribution of essential security information, FedCIRC is forwarding the following information from CIAC bulletin I-053. FedCIRC urges you to act on this information as soon as possible. If you have any questions, please contact FedCIRC: Telephone: +1 888 282 0870 Email: fedcirc@fedcirc.gov =======================FORWARDED TEXT STARTS HERE============================ -----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ 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 -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBNWMR7bnzJzdsy3QZAQHt5wQAx08E00qkInKx3ShFJQWAGOt/9qgZH0lz nfh6MWr3ZgFJjJqM9k0JimZFo34g1dRcyhIarhgkq2+JRXD7x4PRmA4RFSnppQV/ ltca5jbHxEHIjcDjpncb40V7NqQY/3QQdzIMAa8CD7bkdOFlAlKbuD0aKz1tsVBG CL9+PfYt64M= =p0lW -----END PGP SIGNATURE----- ========================FORWARDED TEXT ENDS HERE============================= The National Institute of Standards and Technology (NIST) has established a Federal Computer Incident response Capability (FedCIRC) to assist federal civilians agencies in their incident handling efforts by providing proactive and reactive computer security related services. FedCIRC is a partnership among NIST, the Computer Incident Advisory Capability (CIAC), and the CERT* Coordination Center (CERT/CC). If you believe that your system has been compromised, please contact FedCIRC: Telephone: +1 888 282 0870 Email: fedcirc@fedcirc.gov Web Server: http://www.fedcirc.gov/ * Registered in U.S. Patent and Trademark Office The CERT Coordination Center is part of the Software Engineering Institute. The Software Engineering Institute is sponsored by the U.S. Department of Defense. 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. 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.