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AUSCERT External Security Bulletin Redistribution
ESB-2002.338 -- Microsoft Security Bulletin MS02-034
Cumulative Patch for SQL Server (Q316333)
12 July 2002
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft SQL Server 2000 all editions
Microsoft SQL Server Desktop Engine (MSDE) 2000
Vendor: Microsoft
Operating System: Windows
Impact: Increased Privileges
Administrator Compromise
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Title: Cumulative Patch for SQL Server (Q316333)
Date: 10 July 2002
Software: SQL Server 2000
Impact: Elevation of privilege
Max Risk: Moderate
Bulletin: MS02-034
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-034.asp.
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Issue:
======
This is a cumulative patch that includes the functionality of all
previously released patches for SQL Server 2000. In addition, it
eliminates three newly discovered vulnerabilities affecting SQL
Server 2000 and MSDE 2000 (but not any previous versions of SQL
Server or MSDE):
- - - A buffer overrun vulnerability in a procedure used to encrypt SQL
Server credential information. An attacker who was able to
successfully exploit this vulnerability could gain significant
control over the database and possibly the server itself depending
on the account SQL server runs as.
- - - A buffer overrun vulnerability in a procedure that relates to the
bulk inserting of data in SQL Server tables. An attacker who was
able to successfully exploit this vulnerability could gain
significant control over the database and possibly the server
itself.
- - - A privilege elevation vulnerability that results because of in-
correct permissions on the Registry key that stores the SQL Server
service account information. An attacker who was able to success-
fully exploit this vulnerability could gain greater privileges on
the system than had been granted by the system administrator --
potentially even the same rights as the operating system.
Mitigating Factors:
====================
Unchecked Buffer in Password Encryption Procedure
CVE-CAN-2002-0624
- - - The effect of exploiting the vulnerability would depend on the
specific configuration of the SQL Server service. SQL Server can
be configured to run in a security context chosen by the admin-
istrator. By default, this context is as a domain user. If the
default was chosen, it would minimize the amount of damage an
attacker could achieve.
- - - The vulnerability could be blocked by following best practices.
Specifically, untrusted users should not be able to load and
execute queries of their choice on a database server. In addition,
publicly accessible database queries should filter all inputs prior
to processing.
Unchecked Buffer in Bulk Insert Procedure
CVE-CAN-2002-0641
- - - An attacker would need to already possess significant rights on
the server in order to exploit the vulnerability, as only Bulk
Admins and full administrators have the ability to load and run
queries that invoke the vulnerable procedure.
- - - The effect of exploiting the vulnerability would depend on the
specific configuration of the SQL Server service. SQL Server can
be configured to run in a security context chosen by the admin-
istrator. By default, it runs in the context of a domain user;
if chosen, this would minimize the amount of damage an attacker
could achieve.
- - - Best practices could help minimize the vulnerability. Specifically,
untrusted users should not be able to load and execute queries of
their choice on a database server. In addition, publicly accessible
database queries should filter all inputs prior to processing.
Incorrect Permission on SQL Server Service Account Registry Key
CVE-CAN-2002-0642
- - - Successfully exploiting this vulnerability would require the
ability to load and run queries on the system. By following best
practices and limiting this ability to administrators, users can
mitigate the threat posed by this vulnerability.
- - - Successfully exploiting this vulnerability would also require a
sysadmin or someone that has been granted xp_regwrite execute
permissions.
Risk Rating:
============
Unchecked Buffer in Password Encryption Procedure
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Moderate
Unchecked Buffer in Bulk Insert Procedure
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Moderate
Incorrect Permission on SQL Server Service Account Registry Key
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Moderate
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
Security Bulletin at
http://www.microsoft.com/technet/security/bulletin/ms02-034.asp
for information on obtaining this patch.
Acknowledgment:
===============
- Microsoft thanks Cesar Cerrudo and David Litchfield of Next
Generation Security Software Ltd. for reporting the Unchecked
Buffer in Bulk Update Procedure to us and working with us to
protect customers.
- - ---------------------------------------------------------------------
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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