__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Center ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ ADVISORY NOTICE Multiple Vulnerabilities in Multiple Implementations of SNMP [CERT Advisory CA-2002-03] February 12, 2002 21:00 GMT Number M-042 [Revised 13 February 2002] [Revised 15 February 2002] [Revised 19 February 2002] [Revised 25 February 2002] [Revised 7 March 2002] [Revised 9 April 2002] [Revised 25 April 2002] ______________________________________________________________________________ PROBLEM: The messaging protocol used in the SNMPv1 protocol has been found to be vulnerable to many types of remote attacks including: denial-of-service, unauthorized privilege access, and unstable behavior. PLATFORM: A list of tested platforms is in the CERT bulletin. However, essentially all platforms that use SNMP are vulnerable. Typical platforms that use SNMP for management include routers, switches, hubs, workstations, and servers. Of particular importance are platforms where SNMP is installed by default. DAMAGE: Remote users can crash systems, make systems unstable, and gain privileged access to systems. SOLUTION: Where possible, apply vendor patches. Until patches are available, you should do the following: 1. Block SNMP traffic at the border routers of your network. This includes blocking traffic (TCP and UDP) going in both directions at the border routers for ports 161, 162, 199, 391, 705, and 1993. Blocking the outgoing traffic prevents a site from becoming a source of an attack. 2. Remove or disable SNMP on all border devices. 3. Remove or disable SNMP on any systems that do not need it. 4. Where possible, manage systems with protocols other than SNMP. 5. Filter or segregate internal SNMP traffic to limit access to the SNMP ports on managed systems. 6. Change the default community strings. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. The use of SNMP is widespread within the ASSESSMENT: government, military, and public. Most implementations of SNMP are vulnerable. The vulnerability has been made public. The vulnerabilities can result in remote privileged access to systems. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-042.shtml ORIGINAL BULLETIN: http://www.cert.org/advisories/CA-2002-03.html VENDOR PATCHES OR WORKAROUNDS: NOTE: PLEASE REVIEW CERT'S BULLETIN FOR VENDOR PRODUCT UPDATES AND REVISIONS. COMPAQ, Tru64 update (4-9-02): http://ftp.support.compaq.com/patches/.new/html/SSRT0799.shtml SGI, IRIX update (4-9-02): ftp://patches.sgi.com/support/free/security/advisories/20020201-01-P SGI, IRIX hpsnmpd Vulnerability update (4-25-02): ftp://patches.sgi.com/support/free/security/advisories/20020404-01-P ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of CERT-CC and the Oulu University Secure Programming Group for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Center, 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. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) M-032: HP-UX Security Vulnerability with wu-ftpd 2.6 M-033: Snort IDS Denial of Service Vulnerability M-034: Window File Wiping Utilities Miss Alternate Data Streams M-035: Red Hat Linux "rsync" Vulnerability M-036: Microsoft Windows NT/2000 Trust Domain Vulnerability M-037: Oracle 9iAS Multiple Buffer Overflows in the PL/SQL Module M-038: Cisco Secure Access Control Server NDS User Authentication Vulnerability M-039: Microsoft Telnet Server Buffer Overflow Vulnerability M-040: MS Exchange - Incorrectly Sets Remote Registry Permissions M-041: Microsoft Internet Explorer Cumulative Patch