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securityvulnsSecurityvulnsSECURITYVULNS:DOC:3261
HistoryJul 25, 2002 - 12:00 a.m.

Security Bulletin MS02-038: Cumulative Patch for SQL Server 2000 Service Pack 2 (Q316333)

2002-07-2500:00:00
vulners.com
21

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Title: Cumulative Patch for SQL Server 2000 Service Pack 2
(Q316333)
Date: 24 July 2002
Software: Microsoft SQL Server 2000, Microsoft Desktop Engine
(MSDE) 2000
Impact: Two vulnerabilities, both of which could enable an
attacker to run code on the server.
Max Risk: Moderate
Bulletin: MS02-038

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-038.asp.


Issue:

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.

Risk Rating:

  • Internet systems: Moderate
  • Intranet systems: Moderate
  • Client systems: None

Patch Availability:

Acknowledgment:

  • Cesar Cerrudo

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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