__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN ISC Remote Vulnerabilities in BIND4 and BIND8 [Internet Software Consortium Advisory] November 12, 2002 22:00 GMT Number N-013 ______________________________________________________________________________ PROBLEM: ISC has discovered several vulnerabilities of varying levels of severity in BIND that may lead to remote compromises and DoS attacks against vulnerable DNS servers. The problem lies with buffer overflows causing BIND to cache DNS information or cause BIND 8 servers to abruptly terminate causing DOS attacks on DNS protocols. AFFECTED BIND 4.9.5 to 4.9.10 SOFTWARE: BIND 8.1, 8.2 to 8.2.6, 8.3.0 to 8.3.3 DAMAGE: There is a flaw in the formation of DNS responses containing SIG resource records (RR) that can lead to buffer overflow, remote execution of arbitrary code, and DoS attacks. SOLUTION: ISC recommends upgrading to BIND version 9.2.1, or monitor your vendor's web sites for new information releases. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. CIAC has learned exploits are actively being ASSESSMENT: developed for these vulnerabilities. DNS is a vital Internet protocol, and BIND is used on the vast majority of DNS servers on the Internet. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-013.shtml ORIGINAL BULLETIN: http://www.isc.org/products/BIND/bind-security.html ADDITIONAL CERT: INFORMATION: http://www.cert.org/advisories/CA-2002-31.html ISS: http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp? oid=21469 _____________________________________________________________________________ [***** Start Internet Software Consortium Advisory *****] BIND Vulnerabilities ISC has discovered or has been notified of several bugs which can result in vulnerabilities of varying levels of severity in BIND as distributed by ISC. Upgrading to BIND version 9.2.1 is strongly recommended. Name: "BIND: Remote Execution of Code" Versions affected: BIND 4.9.5 to 4.9.10 BIND 8.1, 8.2 to 8.2.6, 8.3.0 to 8.3.3 Severity: SERIOUS Exploitable: Remotely Type: Possibility to execute arbitrary code. Description: When constructing a response containing SIG records a incorrect space allows a write buffer overflow. It is then possible to execute code with the privleges of named. Workarounds: Disable recursion if possible. Fix: Vendors should speak to ISC about patches. New BIND 4 & 8 releases are coming soon. Active Exploits: None known ISC would like to thank Internet Security Systems for bringing this to our attention. [***** End Internet Software Consortium Advisory *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Internet Software Consortium and Internet Security Systems 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 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org 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. 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