Published:
27 October 1997
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-97.133 -- CERT Vendor-Initiated Bulletin VB-97.12 - opengroup Potential denial of service attack in the OSF/DCE security server 28 October 1997 =========================================================================== The CERT Coordination Center has released the following advisory concerning a potential denial of service vulnerability in the OSF/DCE security 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. Contact information for CERT/CC 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 4477 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. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= 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] = ''; #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============================= If you believe that your system has been compromised, contact the CERT Coordination Center or your representative in the Forum of Incident Response and Security Teams (FIRST). See http://www.first.org/team-info/. We strongly urge you to encrypt any sensitive information you send by email. The CERT Coordination Center can support a shared DES key and PGP. Contact the CERT staff for more information. Location of CERT PGP key ftp://ftp.cert.org/pub/CERT_PGP.key CERT Contact Information - - ------------------------ Email cert@cert.org Phone +1 412-268-7090 (24-hour hotline) CERT personnel answer 8:30-5:00 p.m. EST (GMT-5)/EDT(GMT-4), and are on call for emergencies during other hours. Fax +1 412-268-6989 Postal address CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213-3890 USA CERT publications, information about FIRST representatives, and other security-related information are available from http://www.cert.org/ ftp://ftp.cert.org/pub/ CERT advisories and bulletins are also posted on the USENET newsgroup comp.security.announce To be added to our mailing list for CERT advisories and bulletins, send your email address to cert-advisory-request@cert.org In the subject line, type SUBSCRIBE your-email-address * Registered U.S. Patent and Trademark Office. The CERT Coordination Center is part of the Software Engineering Institute (SEI). The SEI is sponsored by the U. S. Department of Defense. 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