__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft NTLMSSP Privilege Elevation Vulnerability February 8, 2001 22:00 GMT Number L-043 ______________________________________________________________________________ PROBLEM: A flaw in the NTLM Security Support Provider (NTLMSSP) service allows a local user to initiate a specially formed request that executes arbitrary code with LocalSystem security privileges. PLATFORM: Windows NT 4.0 Workstation and Server DAMAGE: Elevation of privileges, resulting in possible Administrator compromise. The user must be local. SOLUTION: Apply the patches in this bulletin. For servers, disallow non- privileged users from locally logging in (this is already a best business practice). ______________________________________________________________________________ VULNERABILITY MEDIUM. The adversary must have a valid local account with ASSESSMENT: execute privileges on the system to exploit this vulnerability and elevate privileges. ______________________________________________________________________________ [****** Start Microsoft Advisory ******] -----BEGIN PGP SIGNED MESSAGE----- - --------------------------------------------------------------------- Title: NTLMSSP Privilege Elevation Vulnerability Date: 07 February 2001 Software: Windows NT 4.0 Impact: Privilege Elevation Bulletin: MS01-008 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/ms01-008.asp - --------------------------------------------------------------------- Issue: ====== A flaw in the NTLM Security Support Provider (NTLMSSP) service could potentially allow a non-administrative user to gain administrative control over the system. In order to perform this attack the user would need a valid login account and the ability to execute arbitrary code on the system. Mitigating Controls: ==================== - This vulnerability could only be exploited by an attacker who could log onto the affected machine interactively. - Servers could only be affected if the attacker were given the ability to load a program of her choice onto the machine and execute it locally. Best practices recommend against this. Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletin http://www.microsoft.com/technet/security/bulletin/ms01-008.asp for information on obtaining this patch. Acknowledgment: =============== - Todd Sabin of BindView (http://razor.bindview.com) - ---------------------------------------------------------------------- THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.3 iQEVAwUBOoHQDI0ZSRQxA/UrAQEYsAf+P433UquQRAqZRjPNGISjtT6NfI9ahVqp 7BYcOpkzNca2xox4e4My1ErNLJQvMjW9qWR/S6vuwW3qx7UymFDh2wReRujxNZWj 2B32SrWQTAwSZCvJZXWwVAQ0/Ad6YsZtSG0SmAnLJbXiWLhPmDpU1ewuvricHFoU YixcN5wuAStMQc1ieK0jkI4UJRXXEzqxvWIgtC1TbC6m5MGYR/jXGONBQIsK66a9 gEbElK8oBIlX5nwBZR7K+5nHZrAmSy/pewSJLdUC2H68eKd/mPurMZtW7LpLRMuQ QoZBtJrUzhf8xGYdyis5p1P5WL/LalE9xqQ/R6NfHjFQ92fxQlEKhw== =BjqE -----END PGP SIGNATURE----- [****** End Microsoft Advisory ******] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft 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/ (or http://ciac.llnl.gov -- they're the same machine) Anonymous FTP: ftp.ciac.org (or ciac.llnl.gov -- they're the same machine) 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) L-032: Class Loading Vulnerability in Sun Java (TM) Runtime Environment L-033: Sun Java Web Server Vulnerability L-034: HP Security Vulnerability in man(1) Command L-035: HP-UX Support Tools Manager Vulnerability L-036: FreeBSD procfs Vulnerabilities L-037: FreeBSD periodic Uses Insecure Temporary Files L-038: FreeBSD inetd ident Server Vulnerability L-039: FreeBSD sort Uses Insecure Temporary Files L-040: The Ramen Worm L-041: Microsoft Hotfix Packaging Anomalies L-042: Compaq Web-enabled Management Software Buffer Overflow