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-----BEGIN PGP SIGNED MESSAGE----- =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2002.088 -- Microsoft Security Bulletin MS02-007 SQL Server Remote Data Source Function Contain Unchecked Buffers 21 February 2002 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SQL Server 7.0 SQL Server 2000 Vendor: Microsoft Operating System: Windows Impact: Execute Arbitrary Code/Commands Denial of Service Access Required: Remote - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- - - ---------------------------------------------------------------------- Title: SQL Server Remote Data Source Function Contain Unchecked Buffers Date: 20 February 2002 Software: Microsoft SQL Server Impact: Run code of attacker's choice on server Max Risk: Moderate Bulletin: MS02-007 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS02-007.asp. - - ---------------------------------------------------------------------- Issue: ====== One of the features of Structured Query Language (SQL) in SQL Server 7.0 and 2000 is the ability to connect to remote data sources. One capability of this feature is the ability to use "ad hoc" connections to connect to remote data sources without setting up a linked server for less-often used data-sources. This is made possible through the use of OLE DB providers, which are low-level data source providers. This capability is made possible by invoking the OLE DB provider directly by name in a query to connect to the remote data source. An unchecked buffer exists in the handling of OLE DB provider names in ad hoc connections. A buffer overrun could occur as a result and could be used to either cause the SQL Server service to fail, or to cause code to run in the security context of the SQL Server. SQL Server can be configured to run in various security contexts, and by default runs as a domain user. The precise privileges the attacker could gain would depend on the specific security context that the service runs in. An attacker could exploit this vulnerability in one of two ways. They could attempt to load and execute a database query that calls one of the affected functions. Conversely, if a web-site or other database front-end were configured to access and process arbitrary queries, it could be possible for an attacker to provide inputs that would cause the query to call one of the functions in question with the appropriate malformed parameters. Mitigating Factors: ==================== - The effect of exploiting the vulnerability would depend on the specific configuration of the SQL Server service. SQL Server can be configured to run in a security context chosen by the administrator. By default, this context is as a domain user. If the rule of least privilege has been followed, it would minimize the amount of damage an attacker could achieve. - Both vectors for exploiting the vulnerability could be blocked by following best practices. Specifically, untrusted users should not be able to load and execute queries of their choice on a database server. In addition, publicly accessible database queries should filter all inputs prior to processing. Risk Rating: ============ - Internet systems: Moderate - Intranet systems: Moderate - Client systems: Moderate Patch Availability: =================== - A patch is available to fix this vulnerability. Please read the Security Bulletin at http://www.microsoft.com/technet/security/bulletin/ms02-007.asp for information on obtaining this patch. - - --------------------------------------------------------------------- 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 7.1 iQEVAwUBPHRGao0ZSRQxA/UrAQE3AAf/W82BFAXaK8KRa4WRMLJZP5SqwIDAyprL 98UfEJvvYIuEFYFkRdfw8O8hsHOtnmgMroPo5b29x9H5OvKClsELk39Xh9ECy5+X 9ZuaxrAiYuBmn1W7ZgaCPqKm+hJb/5hjgIewCnDnvizQsgUSAJ/W+NYqMCX1IB2+ V+BQLMUntijxiqrG+WL9u6aC1KYfrNMxEGw1FlnGFNDR9gJhuaFFdZibd0lJiSSr wsHwXoXyo2/mUdShvx3JCjJmFGw1LQfft4B/AXyI4iuKd8PyOSDXIa8mvRWxYz1i eQSM3NXcgnNn+b5EShqjlkqntz6vJJhH9byWZo9GTP6ZRG1lA0x87Q== =G7DG - -----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 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. 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 original authors 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/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 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 emergencies. -----BEGIN PGP SIGNATURE----- Version: 2.6.3i Charset: noconv Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key iQCVAwUBPHUdKSh9+71yA2DNAQG7zgP/XelO12sIH8Wvbj6YJS6RniwxqZlRrcrf kBGkICbjz/05IkX9FkpphbgafcZhGdIqrl63v2JktjXvQw3KZwFACfnTxXliQJeI iGWVcI5eBUbJXD/5blANBDpvBYB8lGrvGAySvc48sLLf50FwKcbbmN+ypvJdf59O NA3rw3r7hoY= =Hfk9 -----END PGP SIGNATURE-----