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AUSCERT External Security Bulletin Redistribution
ESB-2002.539 -- Microsoft Security Bulletin MS02-056
Cumulative Patch for SQL Server (Q316333)
03 October 2002
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft SQL Server 7.0
Microsoft Data Engine (MSDE) 1.0
Microsoft SQL Server 2000
Microsoft Desktop Engine (MSDE) 2000
Vendor: Microsoft
Operating System: Windows
Impact: Execute Arbitrary Code/Commands
Increased Privileges
Access Required: Remote
Ref: ESB-2002.442
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Title: Cumulative Patch for SQL Server (Q316333)
Date: 02 October 2002
Software: Microsoft SQL Server 7.0
Microsoft Data Engine (MSDE) 1.0
Microsoft SQL Server 2000
Microsoft Desktop Engine (MSDE) 2000
Impact: Four vulnerabilities, the most serious of which could
enable an attacker to gain control over an affected
server.
Max Risk: Critical
Bulletin: MS02-056
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-056.asp.
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Issue:
======
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 vulner-
abilities.
* 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 priv-
ileges. However, when a job step requests that an output file
be created, the SQL Server Agent does so using its own priv-
ileges 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 over-
write 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.
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/ms02-056.asp
for information on obtaining this patch.
Acknowledgment:
===================
* 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)
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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
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OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.
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