__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft Cumulative Patch for SQL Server [Microsoft Security Bulletin MS02-05] October 3, 2002 18:00 GMT Number N-003 [REVISED 16 Jun 2005] ______________________________________________________________________________ PROBLEM: Three new SQL Server vulnerabilities have been identified. 1) A buffer overrun associated with user authentication. 2) A buffer overrun that occurs in the Database Console Commands. 3) A vulnerability with job scheduling executed by the SQL Server Agent. PLATFORM: Microsoft SQL Server 7.0 Microsoft Data Engine (MSDE) 1.0 Microsoft SQL Server 2000 Microsoft Desktop Engine (MSDE) 2000 DAMAGE: An attacker could gain additional privileges on a SQL Server, gain control over a SQL Server 2000 database, or cause programs to run when another user subsequently logs onto the system. SOLUTION: Apply available patch. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. The most serious vulnerability makes it ASSESSMENT: unnecessary for the attacker to successfully authenticate to the server in order to exploit the vulnerability. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-003.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/treeview/default.asp?url= /technet/security/bulletin/MS02-056.asp PATCHES: - Microsoft SQL Server 7.0: http://support.microsoft.com/default.aspx?scid=kb;en-us; Q327068&sd=tech - Microsoft SQL Server 2000: http://support.microsoft.com/default.aspx?scid=kb;en-us; Q316333&sd=tech ADDITIONAL LINK: Microsoft Security Bulletin MS02-035 http://www.microsoft.com/technet/security/Bulletin/MS02-035.mspx ______________________________________________________________________________ REVISION HISTORY: 06/16/2005 - revised to add a link to Microsoft Security Bulletin MS02-035. [***** Start Microsoft Security Bulletin MS02-056 *****] Microsoft Security Bulletin MS02-056 Cumulative Patch for SQL Server (Q316333) Originally posted: October 02, 2002 Summary Who should read this bulletin: System administrators using Microsoft® SQL Server™ 7.0, SQL Server 2000, Microsoft Data Engine (MSDE) 1.0, and Microsoft Desktop Engine (MSDE) 2000. Impact of vulnerability: Four vulnerabilities, the most serious of which could enable an attacker to gain control over an affected server. Maximum Severity Rating: Critical Recommendation: System administrators should apply the patch to affected systems. Affected Software: Microsoft SQL Server 7.0 Microsoft Data Engine (MSDE) 1.0 Microsoft SQL Server 2000 Microsoft Desktop Engine (MSDE) 2000 Technical details Technical description: This is a cumulative patch that includes the functionality of all previously released patches for SQL Server 7.0, SQL Server 2000, and Microsoft Data Engine (MSDE) 1.0, Microsoft Desktop Engine (MSDE) 2000. In addition, it eliminates four newly discovered vulnerabilities. A buffer overrun in a section of code in SQL Server 2000 (and MSDE 2000) associated with user authentication. By sending a specially malformed login request to an affected server, an attacker could either cause the server to fail or gain the ability to overwrite memory on the server, thereby potentially running code on the server in the security context of the SQL Server service. It would not be necessary for the user to successfully authenticate to the server or to be able to issue direct commands to it in order to exploit the vulnerability. A buffer overrun vulnerability that occurs in one of the Database Console Commands (DBCCs) that ship as part of SQL Server 7.0 and 2000. In the most serious case, exploiting this vulnerability would enable an attacker to run code in the context of the SQL Server service, thereby giving the attacker complete control over all databases on the server. A vulnerability associated with scheduled jobs in SQL Server 7.0 and 2000. SQL Server allows unprivileged users to create scheduled jobs that will be executed by the SQL Server Agent. By design, the SQL Server Agent should only perform job steps that are appropriate for the requesting user’s privileges. However, when a job step requests that an output file be created, the SQL Server Agent does so using its own privileges rather than the job owners privileges. This creates a situation in which an unprivileged user could submit a job that would create a file containing valid operating system commands in another user’s Startup folder, or simply overwrite system files in order to disrupt system operation The patch also changes the operation of SQL Server, to prevent non-administrative users from running ad hoc queries against non-SQL OLEDB data sources. Although the current operation does not represent a security vulnerability, the new operation makes it more difficult to misuse poorly coded data providers that might be installed on the server. Mitigating factors: Unchecked buffer in SQL Server 2000 authentication function: This vulnerability on affects SQL Server 2000 and MSDE 2000. Neither SQL Server 7.0 nor MSDE 1.0 are affected. If the SQL Server port (port 1433) were blocked at the firewall, the vulnerability could not be exploited from the Internet. Exploiting this vulnerability would allow the attacker to escalate privileges to the level of the SQL Server service account. By default, the service runs with the privileges of a domain user, rather than with system privileges. Unchecked buffer in Database Console Commands: Exploiting this vulnerability would allow the attacker to escalate privileges to the level of the SQL Server service account. By default, the service runs with the privileges of a domain user, rather than with system privileges. The vulnerability could only be exploited by an attacker who could authenticate to an affected SQL Server or has permissions to execute queries directly to the server. The vulnerability could only be exploited by an attacker who could authenticate to an affected SQL Server. Flaw in output file handling for scheduled jobs: The vulnerability could only be exploited by an attacker who could authenticate to an affected SQL server. Severity Rating: Unchecked buffer in SQL Server 2000 authentication function: Internet Servers Intranet Servers Client Systems SQL Server 7.0 (Including MSDE 1.0) None None None SQL Server 2000 (Including MSDE 2000) Critical Critical None Unchecked buffer in Database Console Commands: Internet Servers Intranet Servers Client Systems SQL Server 7.0 (Including MSDE 1.0) Critical Critical None SQL Server 2000 (Including MSDE 2000) Critical Critical None Flaw in output file handling for scheduled jobs: Internet Servers Intranet Servers Client Systems SQL Server 7.0 (Including MSDE 1.0) Critical Critical None SQL Server 2000 (Including MSDE 2000) Critical Critical None Aggregate Severity of all issues included in this patch (including issues addressed in previously released patches): Internet Servers Intranet Servers Client Systems SQL Server 7.0 (Including MSDE 1.0) Critical Critical None SQL Server 2000 (Including MSDE 2000) Critical Critical None The above assessment is based on the types of systems affected by the vulnerability, their typical deployment patterns, and the effect that exploiting the vulnerability would have on them. Vulnerability identifiers: Unchecked buffer in SQL Server 2000 authentication function: CAN-2002-1123 Unchecked buffer in Database Console Commands: CAN-2002-1137 Flaw in output file handling for scheduled jobs: CAN-2002-1138 Tested Versions: Microsoft tested SQL Server 2000 and SQL Server 7.0 (and their associated versions of MSDE) to assess whether they are affected by these vulnerabilities. Previous versions are no longer supported, and may or may not be affected by these vulnerabilities. Patch availability Download locations for this patch Microsoft SQL Server 7.0: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q327068&sd=tech Microsoft SQL Server 2000: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q316333&sd=tech Additional information about this patch Installation platforms: The SQL Server 7.0 patch can be installed on systems running SQL Server 7.0 Service Pack 4. The SQL Server 2000 patch can be installed on systems running SQL Server 2000 Service Pack 2. Inclusion in future service packs: The fix for this issue will be included in SQL Server 2000 Service Pack 4. Reboot needed: No. It is only necessary to restart the SQL Services Patch can be uninstalled: The readme.txt contained in the downloadable packages contains uninstall instructions. Superseded patches: This patch supersedes the one provided in Microsoft Security Bulletin MS02-043, which was itself a cumulative patch. Verifying patch installation: SQL Server 7.0: To ensure you have the fix installed properly, verify the individual files by consulting the date/time stamp of the files listed in the file manifest in Microsoft Knowledge Base article at http://support.microsoft.com/support/misc/kblookup.asp?id=Q327068 SQL Server 2000: To ensure you have the fix installed properly, verify the individual files by consulting the date/time stamp of the files listed in the file manifest in Microsoft Knowledge Base article at http://support.microsoft.com/support/misc/kblookup.asp?id=Q316333 Caveats: This patch does not include the functionality of the Killpwd tool provided in Microsoft Security Bulletin MS02-035. The patch does not supersede any previously released patches for MDAC or OLAP under SQL Server 2000. At this writing, these patches include the ones discussed in: Microsoft Security Bulletin MS00-092 Microsoft Security Bulletin MS01-041 Microsoft Security Bulletin MS02-030 The process for installing the patch varies somewhat depending on the specific configuration of the server. System administrators should ensure that they read the Readme.txt file in the patch package to ensure the patch is installed correctly. Localization: Localized versions of this patch are available at the locations discussed in "Patch Availability". Obtaining other security patches: Patches for other security issues are available from the following locations: Security patches are available from the Microsoft Download Center, and can be most easily found by doing a keyword search for "security_patch". Patches for consumer platforms are available from the WindowsUpdate web site Other information: Acknowledgments Microsoft thanks the following individuals: Issue regarding ad hoc queries against non-SQL OLEDB data sources: sk@scan-associates.net and pokleyzz@scan-associates.net Unchecked buffer in Database Console Commands: Martin Rakhmanoff (jimmers@yandex.ru) Support: Microsoft Knowledge Base article Q323255 discusses this issue and will be available approximately 24 hours after the release of this bulletin. Knowledge Base articles can be found on the Microsoft Online Support web site. Technical support is available from Microsoft Product Support Services. There is no charge for support calls associated with security patches. Security Resources: The Microsoft TechNet Security Web Site provides additional information about security in Microsoft products. Disclaimer: 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. Revisions: V1.0 (October 02, 2002): Bulletin Created. [***** End Microsoft Security Bulletin MS02-056 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Microsoft Corporation 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/ Anonymous FTP: ftp.ciac.org 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. 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