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Bulletins   Conferences   News & Media   Services   Web Log   Site Map   Site Help   Member login Login »  Become a member »   Home » Security Bul... » ESB-2003.0636 -- CERT Advisory CA-2003-23 -- RPCSS V...   ESB-2003.0636 -- CERT Advisory CA-2003-23 -- RPCSS Vulnerabilities in Microsoft Windows Date: 11 September 2003 References: AU-2003.010  AU-2003.011   Click here for printable version -----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2003.0636 -- CERT Advisory CA-2003-23 RPCSS Vulnerabilities in Microsoft Windows 11 September 2003 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Remote Procedure Call (RPC) Service Publisher: CERT/CC Operating System: Windows Server 2003 Windows XP Windows 2000 Windows NT Server 4.0, Terminal Server Edition Windows NT Server 4.0 Windows NT Workstation 4.0 Platform: x86 IA-64 Impact: Administrator Compromise Denial of Service Access Required: Remote CVE Names: CAN-2003-0715, CAN-2003-0528, CAN-2003-0605 Ref: AL-2003.15 AL-2003.11 AU-2003.011 AU-2003.010 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- CERT Advisory CA-2003-23 RPCSS Vulnerabilities in Microsoft Windows Original release date: September 10, 2003 Last revised: -- Source: CERT/CC A complete revision history can be found at the end of this file. Systems Affected * Microsoft Windows NT Workstation 4.0 * Microsoft Windows NT Server 4.0 * Microsoft Windows NT Server 4.0, Terminal Server Edition * Microsoft Windows 2000 * Microsoft Windows XP * Microsoft Windows Server 2003 Overview Microsoft has published a bulletin describing three vulnerabilities that affect numerous versions of Microsoft Windows. Two of these vulnerabilities are remotely exploitable buffer overflows that may allow an attacker to execute arbitrary code with system privileges. The third vulnerability may allow a remote attacker to cause a denial of service. I. Description The Microsoft RPCSS Service is responsible for managing Remote Procedure Call (RPC) messages. There are two buffer overflow vulnerabilities in the RPCSS service, which is enabled by default on many versions of Microsoft Windows. These buffer overflows occur in sections of code that handle DCOM activation messages sent to the RPCSS service. The CERT/CC is tracking these vulnerabilities as VU#483492 and VU#254236, which correspond to CVE candidates CAN-2003-0715 and CAN-2003-0528, respectively. The buffer overflows discussed in this advisory are different than those discussed in previous advisories. Microsoft has also published information regarding a denial-of-service vulnerability in the RPCSS service. This vulnerability only affects Microsoft Windows 2000 systems. The CERT/CC is tracking this vulnerability as VU#326746, which corresponds to CVE candidate CAN-2003-0605. This vulnerability was previously discussed in CA-2003-19. II. Impact By exploiting either of the buffer overflow vulnerabilities, remote attackers may be able to execute arbitrary code with Local System privileges. By exploiting the denial-of-service vulnerability, remote attackers may be able to disrupt the RPCSS service. This may result in general system instability and require a reboot. III. Solution Apply a patch from Microsoft Microsoft has published Microsoft Security Bulletin MS03-039 to address this vulnerability. For more information, please see http://www.microsoft.com/technet/security/bulletin/MS03-039.asp This bulletin supersedes MS03-026. Block traffic to and from common Microsoft RPC ports As an interim measure, users can reduce the chance of successful exploitation by blocking traffic to and from well-known Microsoft RPC ports, including * Port 135 (tcp/udp) * Port 137 (udp) * Port 138 (udp) * Port 139 (tcp) * Port 445 (tcp/udp) * Port 593 (tcp) To prevent compromised hosts from contacting other vulnerable hosts, the CERT/CC recommends that system administrators filter the ports listed above for both incoming and outgoing traffic. Disable COM Internet Services and RPC over HTTP COM Internet Services (CIS) is an optional component that allows RPC messages to be tunneled over HTTP ports 80 and 443. As an interim measure, sites that use CIS may wish to disable it as an alternative to blocking traffic to and from ports 80 and 443. Disable DCOM Disable DCOM as described in MS03-039 and Microsoft Knowledge Base Article 825750. _________________________________________________________________ This document was written by Jeffrey P. Lanza and is based upon the information in MS03-039. ______________________________________________________________________ This document is available from: http://www.cert.org/advisories/CA-2003-23.html ______________________________________________________________________ CERT/CC Contact Information Email: cert@cert.org Phone: +1 412-268-7090 (24-hour hotline) Fax: +1 412-268-6989 Postal address: CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213-3890 U.S.A. CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends. Using encryption We strongly urge you to encrypt sensitive information sent by email. Our public PGP key is available from http://www.cert.org/CERT_PGP.key If you prefer to use DES, please call the CERT hotline for more information. Getting security information CERT publications and other security information are available from our web site http://www.cert.org/ To subscribe to the CERT mailing list for advisories and bulletins, send email to majordomo@cert.org. Please include in the body of your message subscribe cert-advisory * "CERT" and "CERT Coordination Center" are registered in the U.S. Patent and Trademark Office. ______________________________________________________________________ NO WARRANTY Any material furnished by Carnegie Mellon University and the Software Engineering Institute is furnished on an "as is" basis. Carnegie Mellon University makes no warranties of any kind, either expressed or implied as to any matter including, but not limited to, warranty of fitness for a particular purpose or merchantability, exclusivity or results obtained from use of the material. Carnegie Mellon University does not make any warranty of any kind with respect to freedom from patent, trademark, or copyright infringement. ______________________________________________________________________ Conditions for use, disclaimers, and sponsorship information Copyright 2003 Carnegie Mellon University. Revision History Sep 10, 2003: Initial release - -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.8 iQCVAwUBP1+NqTpmH2w9K/0VAQHUbwP/aQ8osvAzy2BswiPOpLFoUhC4GIjdtXcx mGcVDXyVcu4v4pKym8+ojIrQhdWKwOt9ZL8+RSaq8IMjUgE11BX5zA1/1WZhkE7p hlu+HDTkDc5WvFrNqbChrC3gX2fgjI9hjx361SXuhgXAxI5nLz2of50pb+GxPWvA ZQJp4ymyuyI= =A+8F - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. 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/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 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 member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBP1+2rSh9+71yA2DNAQF2/AP+JIVlc8gjfM9pBXoyAbBLiCy6QJ1IFD2p pqp7LhgyxaHMAq9wiOMAsHHuPCEnnlLNfYE6VSc+zjQnaGWbeeqpm+eo02bWTOhJ pTkeHf26b6JdLHKhs6a0qiKp+hKYJGSr8dBLatfbGm3iOxnVJ12T/StpyzeG3d0O ryEhiIW6ppk= =wzbq -----END PGP SIGNATURE-----

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