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Microsoft Security Bulletin - Elevation of Privilege in SQL Server Web Tasks (MS02-061)
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- ----------------------------------------------------------------------
Title:      Elevation of Privilege in SQL Server Web Tasks (Q316333)
Released:   16 October 2002
Software:   Microsoft SQL Server 7.0 and 2000
Impact:     Elevation of privilege
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.
- ----------------------------------------------------------------------

Issue:
======
SQL Server 7.0 and 2000 provide stored procedures which is a coll-
ection 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:
============
 - Internet systems: Critical
 - Intranet systems: Critical
 - Client systems: None

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-061.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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