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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
Microsoft Cumulative Patch for SQL Server
[Microsoft Security Bulletin MS02-05]
October 3, 2002 18:00 GMT Number N-003
______________________________________________________________________________
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
______________________________________________________________________________
[***** 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
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PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
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