-----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Open Group OSF/DCE Denial-of-Service Vulnerability October 28, 1997 22:00 GMT Number I-008 ______________________________________________________________________________ PROBLEM: A vulnerability has been identified in the OSF/DCE security server. PLATFORM: All releases of OSF/DCE DAMAGE: Potential denial of service attack due to a buffer overrun that causes memory corruption. SOLUTION: Apply the workaround listed below. ______________________________________________________________________________ VULNERABILITY The Open Group sent a notification to all current DCE support ASSESSMENT: licensees providing the fix. ______________________________________________________________________________ [ Start CERT Advisory ] ============================================================================= CERT* Vendor-Initiated Bulletin VB-97.12 October 27, 1997 Topic: Potential denial of service attack in the OSF/DCE security server Source: The Open Group To aid in the wide distribution of essential security information, the CERT Coordination Center is forwarding the following information from The Open Group. Open Group urges you to act on this information as soon as possible. Open Group contact information is included in the forwarded text below; please contact them if you have any questions or need further information. =======================FORWARDED TEXT STARTS HERE============================ Advisory on OSF/DCE Denial of Service Attack October 23, 1997 It has been discovered that OSF/DCE has a potential problem in the security server that could allow for a denial of service attack. PROBLEM: If a principal, group, or organization is greater than 1024 characters (including the cell name, so the actual name limit is less than 1024) when passed to security daemon (secd), it will cause secd core dump. The buffer is overrun causing memory corruption. In certain cases, the lookup attempt (or add or whatever) on the client will then rebind to another secd to make the request, eventually crashing all security daemons in the cell. HOW TO AVOID: This potential denial of service attack has existed in all releases of OSF/DCE to date. The Open Group sent a notification to all current DCE support licensees providing the following fix. The Open Group is in the process of incorporating a fix for this defect to all future DCE maintenance releases. The end-users may ask their DCE vendors for such a fix. SOURCE CODE FIX: The quick fix is the following: In rsdb_name_util.c, the "rsdb_name_util_complete_name" routine should perform the following check after the ustrncpy. /* Retrieve the name_key record of the given domain directory. */ if(!check_domain(domain)) { SET_STATUS(st, sec_rgy_bad_domain); return false; } rsdb_util_get_key_of_id(domain, START_OF_LIST, (Pointer)&name_key, &name_key_len); ustrncpy(complete_name, name_key.name, name_key.name_len); complete_name[name_key.name_len] = '\0'; #ifdef FIX if (object_name_len < 1 || object_name_len + name_key.name_len + 1 > sec_rgy_name_t_size - 1) { return false; } #endif /* FIX */ if(object_name_len > 0) { ustrcat(complete_name, "/"); ustrcat(complete_name, object_name); } return true; CONTACT INFORMATION: The Open Group DCE Systems Engineering The Open Group 11 Cambridge Center, Cambridge, MA 02142 Telephone: +1 617 621 8990 E-mail: dce-support-admin@opengroup.org ========================FORWARDED TEXT ENDS HERE============================= [ End CERT Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of CERT and The Open Group 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: +1 510-422-8193 FAX: +1 510-423-8002 STU-III: +1 510-423-2604 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 510-422-8193 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://ciac.llnl.gov/ Anonymous FTP: ciac.llnl.gov (198.128.39.53) Modem access: +1 (510) 423-4753 (28.8K baud) +1 (510) 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) H-107: UNIX Buffer Overflow in rdist Vulnerability H-108: SunOS, Solaris libX11 Buffer Overflow Vulnerability H-109: Solaris DCE and AFS Integrated login Vulnerability H-110: Samba Servers Vulnerability I-001: HP-UX Denial of Service via telnet Vulnerability I-002: Cisco CHAP Authentication Vulnerability I-003: HP-UX mediainit(1) Vulnerability I-004: NEC/UNIX "nosuid" mount option Vulnerability I-006: IBM AIX "xdat" Buffer Overflow Vulnerability I-007: Sun Solaris Vulnerabilies (nis_cachemgr, ftpd/rlogind, sysdef) -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBNFe+pLnzJzdsy3QZAQGf/AP/Uuw0RZQhORvj3RX69d2g+EilRQfWw6nT wDMRKFAo5S02OcoTkuWloyptPPljDoxFMbCpN/TNtG+/5gLj0f5GqT9vBSyVn7hY FRLS+DgTexr4ijlnNDzCt8FeNIA7TNit0Xjc8EKDoM9ON9c5NGG521ZSRAkwyByT 87JWbe0wto4= =yx+i -----END PGP SIGNATURE-----