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===========================================================================
             AUSCERT External Security Bulletin Redistribution

           ESB-2003.0056 -- Microsoft Security Bulletin MS02-061
         Elevation of Privilege in SQL Server Web Tasks (Q316333)
                              27 January 2003

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                SQL Server 7.0
                        SQL Server 2000
                        Microsoft Data Engine (MSDE) 1.0
                        Microsoft Desktop Engine (MSDE) 2000
Vendor:                 Microsoft
Operating System:       Windows
Impact:                 Increased Privileges
Access Required:        Remote

Ref:                    AU-2003.002
                        ESB-2002.582
                        ESB-2002.539
                        ESB-2002.442
                        ESB-2002.364

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Title:      Elevation of Privilege in SQL Server Web Tasks (Q316333)
Released:   October 16, 2002
Revised:    January 26, 2003 (version 2.0)
Software:   Microsoft(r) SQL Server(tm) 7.0, SQL Server 2000, 
            Microsoft Data Engine (MSDE) 1.0, and Microsoft Desktop 
            Engine (MSDE) 2000.
Impact:     Elevation of Privileges
Max Risk:   Critical 

Bulletin:   MS02-061

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS02-061.asp
- - ----------------------------------------------------------------------

Reason for Revision:
====================

Microsoft Security Bulletin is a cumulative security patch for 
Microsoft SQL Server. As a cumulative patch it includes a fix for a 
vulnerability first included in Microsoft Security Bulletin MS02-
039, which has been exploited as part of the "Slammer" worm. 
Customers who have not installed a recent SQL Server security patch 
(MS02-039, MS02-043, MS02-056 or MS02-061) are strongly encouraged 
to install this updated patch, which now includes an installer for 
ease of use.

Microsoft originally released this bulletin and patch on October 16, 
2002 to correct a security vulnerability in a SQL Server stored 
procedure. The patch was and still is effective in eliminating the 
security vulnerability, and includes the fix for the vulnerability 
exploited by the "Slammer" worm virus (Note:  Slammer affects only 
SQL Server 2000 and MSDE 2000). However, while the patch was fully 
effective in eliminating the security vulnerability, in October, 
2002, it was found to interfere with SQL Server operations under 
some circumstances. As a result, on October 30, 20002, an 
additional non-security patch 
http://support.microsoft.com/default.aspx?scid=kb;en-us;317748 was 
required to ensure normal operations of SQL Server. 

In order to simplify the process by which customers update their 
systems, Microsoft has now re-released the patch for SQL Server 
2000.  The patch for SQL Server 2000 was re-released to help 
customers patch their systems in response to the "Slammer" worm 
virus. The re-released patch integrates the original security patch 
released with this bulletin and the hotfix discussed in Microsoft 
Knowledge Base article 317748 that was released to ensure the 
correct operation of SQL Server. The re-release has been packaged 
with a new SQL Server patch installer.  The installer eliminates 
the need for system administrators to copy SQL Server files onto 
their systems manually. The only changes that Microsoft has made to 
this patch were to incorporate the hotfix discussed in Microsoft 
Knowledge Base article 317748 into the re-released patch and to 
package the patch with an installer.  

Customers who have not already applied the patch originally 
released with this bulletin should apply the re-released patch. 
Customers who have already applied to their SQL 2000 systems both 
the original security patch and patch 317748 do not need to apply 
this re-released patch - the original patches are effective in 
ensuring correct operation of SQL Server and in protecting SQL 
Server systems (including protection from the Slammer worm).  
Customers who have applied only the original version of this patch 
should consider applying the patch discussed in Microsoft Knowledge 
Base article 317748, subject to the caveat discussed in the FAQ and 
caveats sections below.

Issue:
======
The original version of this bulletin released a cumulative patch 
that included the functionality of all previously released patches 
for SQL Server 7.0, SQL Server 2000, Microsoft Data Engine (MSDE) 
1.0, and Microsoft Desktop Engine (MSDE) 2000. The original patch 
also eliminated one newly discovered vulnerability in a SQL Server 
stored procedure. 

SQL Server 7.0 and SQL Server 2000 provide stored procedures which 
are collections of Transact-SQL statements stored under a name and 
processed as a group. One stored procedure, an extended stored 
procedure and weak permissions on a table combine to allow a low 
privileged user the ability to run, delete, insert or update web 
tasks. 

An attacker who is able to authenticate to a SQL server could 
delete, insert or update all the web tasks created by other users. 
In addition, the attacker could run already created web tasks in 
the context of the creator of the web task. This typically runs in 
the context of the SQL Server Agent service account.

Mitigating Factors:
====================

- - -It is necessary to be an authenticated user of the SQL Server. 
- - -Exploiting this vulnerability could 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. 
- - -Web tasks have to exist in the first place.

Risk Rating:
============
Critical

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletins at
   http://www.microsoft.com/technet/security/bulletin/ms03-003.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 Microsoft thanks  David Litchfield of Next Generation Security 
Software Ltd. for reporting this issue to us and working with us to 
protect customers. We would also like to thank Martin Rakhmanoff 
(jimmers@yandex.ru) for contributing to the investigation.
- - -------------------------------------------------------------------
- - --

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.


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