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Microsoft Unchecked Buffer in SQL Server 2000 Utilities Could Allow Code Execution (CIAC M-101)




             __________________________________________________________
          
                             The U.S. Department of Energy
                          Computer Incident Advisory Capability
                              ___   __ __     _      ___
                             /        |      /_\    /
                             \___   __|__   /   \   \___
             __________________________________________________________

                                 INFORMATION BULLETIN

                 Microsoft Unchecked Buffer in SQL Server 2000 Utilities
                               Could Allow Code Execution
                         [Microsoft Security Bulletin MS02-038]

July 26, 2002 15:00 GMT                                         Number M-101
______________________________________________________________________________
PROBLEM:       Security Vulnerabilities were found in Microsoft SQL Server 2000
               and Microsoft Desktop Engine 2000.
PLATFORM:      Those running Microsoft SQL Server 2000 and Microsoft Desktop
               Engine (MSDE) 2000.
DAMAGE:        The vulnerabilities enable users to run code on the server.
SOLUTION:      Apply the patch as directed by the advisory. 
______________________________________________________________________________
VULNERABILITY  The risk is LOW.  The user must already have significant
ASSESSMENT:    privileges such as being a db_owner or db_ddladmin, or
               being able to log on through the server's keyboard.
 ______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:       http://www.ciac.org/ciac/bulletins/m-101.shtml 
 ORIGINAL BULLETIN:   http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS02-038.asp 
 PATCHES:             http://support.microsoft.com/support/misc/kblookup.asp?id=Q316333
______________________________________________________________________________

[***** Start Microsoft Security Bulletin MS02-038 *****]
    
Microsoft Security Bulletin MS02-038

Unchecked Buffer in SQL Server 2000 Utilities Could Allow Code Execution 
(Q316333)

Originally posted: July 24, 2002

Summary
Who should read this bulletin: System administrators using Microsoft(r) SQL 
Server(tm) 2000 and Microsoft Desktop Engine 2000. 

Impact of vulnerability: Two vulnerabilities, both of which could enable 
an attacker to run code on the server. 

Maximum Severity Rating: Moderate 

Recommendation: System administrators should consider installing the patch. 

Affected Software: 

* Microsoft SQL Server 2000. 
* Microsoft Desktop Engine (MSDE) 2000 

Technical details

Technical description: 


This patch eliminates two newly discovered vulnerabilities affecting SQL 
Server 2000 and MSDE 2000: 

* A buffer overrun vulnerability that occurs in several Database 
  Consistency Checkers (DBCCs) that ship as part of SQL Server 2000. DBCCs 
  are command console utilities that allow maintenance and other operations 
  to be performed on a SQL Server. While many of these are executable only 
  by sysadmin, some are executable by members of the db_owner and db_ddladmin 
  roles as well. 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 SQL injection vulnerability that occurs in two stored procedures used in 
  database replication. One of these can only be run by users who have been 
  assigned the db_owner role; the other, due to a permissions error, could be 
  run by any user who could log onto the server interactively. Exploiting the 
  vulnerability could enable an attacker to run operating system commands on 
  the server, but is subject to significant mitigating factors as discussed 
  below. 

Mitigating factors: 

Buffer Overrun Vulnerability in Database Consistency Checkers: 

* Both the db_owner and db_ddladmin roles carry with them significant 
  privileges, and only should be granted to trusted users. 

* This allows the user to escalate privileges to the level of the service 
  account. And this escalation would be minimal if best practices were 
  followed and SQL were installed as a normal domain account. 

SQL Injection Vulnerability in Replication Stored Procedures: 

* Exploiting the vulnerability would, at a minimum, require that the 
  attacker have the ability to log onto the server interactively. However, 
  best practices strongly militate against giving such permissions to 
  untrusted users. 

* Simply being able to run the affected stored procedures would not enable 
  an attacker to exploit the vulnerability. As discussed in the FAQ, the 
  vulnerability could only be exploited if the administrator had previously 
  enabled the SQL Server Agent Proxy account. By default, this account is 
  disabled. 

* Even when enabled, the SQL Server Agent Proxy account has by default only 
  the privileges associated with a domain user. If administrators follow 
  best practices, it is likely that any user who could exploit the 
  vulnerability would already have this level of privilege. 

Severity Rating: 

Buffer Overrun Vulnerability in Database Consistency Checkers:  

                | Internet Servers | Intranet Servers | Client Systems |
SQL Server 2000 | Moderate         | Moderate         | None           |


SQL Injection Vulnerability in Replication Stored Procedures:  

                | Internet Servers | Intranet Servers | Client Systems |
SQL Server 2000 | Low              | Low              | 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. The Buffer Overrun 
vulnerability in Database Consistency Checkers has been rated as a 
moderate-risk vulnerability because it could only be exploited by a user 
who already had significant privileges on the system. The SQL Injection 
vulnerability in replication stored procedures has been rated as a low-risk 
vulnerability because it could not be exploited under default conditions. 

Vulnerability identifiers: 

* Buffer overrun vulnerability in Database Consistency Checkers: CAN-2002-0644 

* SQL injection vulnerability in replication stored procedures: CAN-2002-0645 

Tested Versions:

Microsoft tested SQL 7.0 and 2000 (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 

* SQL Server 2000:
  http://support.microsoft.com/support/misc/kblookup.asp?id=Q316333 

Additional information about this patch

Installation platforms: 

This patch can only 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 3. 

Reboot needed: No. The SQL Server and SQL Agent services only needs to be 
restarted after applying the patch 

Patch can be uninstalled: Yes. The readme.txt describing the installation 
instructions also contains instructions on removing the patch. 

Superseded patches: This patch supersedes the one provided in Microsoft Security 
Bulletin MS02-034, which was itself a cumulative patch. 

Verifying patch installation: 

* 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 also 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 MS02-020 
* * 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  Cesar Cerrudo for reporting this issue to us and working with us 
to protect customers.

Support: 

* Microsoft Knowledge Base article Q316333 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 (July 24, 2002): Bulletin Created.
 
[***** End Microsoft Security Bulletin MS02-038 *****]

______________________________________________________________________________

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.

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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
communities, please contact your agency's response team to report
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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
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