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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN
Microsoft Unchecked Buffer in SQLXML Vulnerability
[Microsoft Security Bulletin MS02-030]
June 13, 2002 19:00 GMT Number M-091
______________________________________________________________________________
PROBLEM: Two vulnerabilities exist in Microsoft's SQLXML. The first
vulnerability is an unchecked buffer in an ISAPI extension that
could allow an attacker to run code of their choice on
Microsoft's IIS Server. The second vulnerability is a function
specifying an XML tag that could allow an attacker to run
script on a user's computer with higher privileges.
PLATFORM: Microsoft SQL Server 2000
DAMAGE: Exploiting these vulnerabilities can lead to an attacker
running code of choice, or an attacker to run script on a
user's computer, therefore escalating his or her privileges.
SOLUTION: Apply appropriate patches as prescribed by Microsoft.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. An administrator must have set up a virtual
ASSESSMENT: directory structure and naming used by the SQLXML HTTP
components on an IIS Server. An attacker must know the location
of the virtual directory on the IIS Server in order to exploit
it.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/m-091.shtml
ORIGINAL BULLETIN:
http://www.microsoft.com/technet/treeview/
default.asp?url=/technet/security/
bulletin/MS02-030.asp
______________________________________________________________________________
[***** Start Microsoft Security Bulletin MS02-030 *****]
Microsoft Security Bulletin MS02-030
Unchecked Buffer in SQLXML Could Lead to Code Execution (Q321911)
Originally posted: June 12, 2002
Summary
Who should read this bulletin: System administrators using Microsoft®
SQL Server™ 2000.
Impact of vulnerability: Two vulnerabilities, the most serious of which could run
code of attacker’s choice.
Maximum Severity Rating: Moderate
Recommendation: System administrators who have enabled SQLXML and enabled data
queries over HTTP should install the patch immediately.
Affected Software:
Microsoft SQLXML, which ships as part of SQL Server 2000 and can be downloaded
separately.
Technical details
Technical description:
SQLXML enables the transfer of XML data to and from SQL Server 2000. Database
queries can be returned in the form of XML documents which can then be stored or
transferred easily. Using SQLXML, you can access SQL Server 2000 using XML
through your browser over HTTP.
Two vulnerabilities exist in SQLXML:
* An unchecked buffer vulnerability in an ISAPI extension that could, in the worst
case, allow an attacker to run code of their choice on the Microsoft Internet
Information Services (IIS) Server.
* A vulnerability in a function specifying an XML tag that could allow an attacker
to run script on the user’s computer with higher privilege. For example, a script
might be able to be run in the Intranet Zone instead of the Internet Zone.
Mitigating factors:
Unchecked buffer in SQLXML ISAPI extension:
* The administrator must have set up a virtual directory structure and naming used by
the SQLXML HTTP components on an IIS Server. The vulnerability gives no means for an
attacker to obtain the directory structure.
* The attacker must know the location of the virtual directory on the IIS Server that
has been specifically set up for SQLXML.
Script injection via XML tag:
* For an attack to succeed, the user must have privileges on the SQL Server.
* The attacker must know the address of the SQL Server on which the user has privileges.
* The attacker must lure the user to a website under their control.
* Queries submitted via HTTP are not enabled by default.
* Microsoft best practices recommends against allowing ad hoc URL queries against the
database through a virtual root.
* The script will run in the user’s browser according to the IE security zone used to
connect with the IIS Server hosting the SQLXML components. In most cases, this will be
the Intranet Zone.
Severity Rating:
Unchecked buffer in SQLXML ISAPI extension: Internet Servers Intranet Servers Client Systems
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Microsoft SQLXML version shipped with SQL
Server 2000 Gold Moderate Moderate None
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Microsoft SQLXML version 2 Moderate Moderate None
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Microsoft SQLXML versions 3 Moderate Moderate None
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Script injection via XML tag: Internet Servers Intranet Servers Client Systems
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Microsoft SQLXML version
shipped with SQL Server 2000
Gold Moderate Moderate None
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Microsoft SQLXML version 2 Moderate Moderate None
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Microsoft SQLXML versions 3 Moderate Moderate None
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The above assessment is based on the types of systems affected by the vulnerability, their
typical deployment patterns, and the effect that exploiting the vulnerability would have
on them. The criticality is reckoned due to the possibility of remotely running code in the
security context of the operating system and the possibility of running script on a user’s
system with elevated privileges.
Vulnerability identifiers:
* Unchecked buffer in SQLXML ISAPI extension - CAN-2002-0186
* Script injection via XML tag - CAN-2002-0187
Tested Versions:
Microsoft tested the original SQLXML version shipping with SQL Server 2000 Gold as well as
SQLXML versions 1, 2 and 3 to assess whether they are affected by this vulnerability.
SQLXML version 1 is no longer supported, and should be upgraded to a later version as
discussed in the FAQ below.
Patch availability
Download locations for this patch
* Microsoft SQLXML version shipping with SQL 2000 Gold:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=39547
* Microsoft SQLXML version 2:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=38480
* Microsoft SQLXML version 3:
http://www.microsoft.com/Downloads/Release.asp?ReleaseID=38481
Additional information about this patch
Installation platforms:
This patch can be installed on systems running SQL Server 2000 SP2
Inclusion in future service packs:
The fix for this issue will be included in SQL Server 2000 SP3.
Reboot needed: Yes
Superseded patches: None.
Verifying patch installation:
SQLXML shipping with SQL Server 2000 Gold:
* To verify that the patch has been installed on the machine, confirm that the following
registry key has been created on the machine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\DataAccess\Q321858
SQLXML Version 2.0:
* To verify that the patch has been installed on the machine, confirm that the following
registry key has been created on the machine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\SQLXML 2.0\Q321460
SQLXML Version 3.0:
* To verify that the patch has been installed on the machine, confirm that the following
registry key has been created on the machine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\SQLXML 3.0\Q320833
Caveats:
None
Localization:
This patch can be applied on all language versions.
Obtaining other security patches:
Patches for other security issues are available from the following locations:
* Security patches are available from the Microsoft Download Center, and can be most
easily found by doing a keyword search for "security_patch".
* Patches for consumer platforms are available from the WindowsUpdate web site
* All patches available via WindowsUpdate also are available in a redistributable form
from the WindowsUpdate Corporate site.
Other information:
Acknowledgments
Microsoft thanks Matt Moore of Westpoint Ltd. for reporting this issue to us and working
with us to protect customers.
Support:
* Microsoft Knowledge Base article Q321911 discusses this issue and will be available
approximately 24 hours after the release of this bulletin. Knowledge Base articles can be
found on the Microsoft Online Support web site.
* Technical support is available from Microsoft Product Support Services. There is no charge
for support calls associated with security patches.
Security Resources: The Microsoft TechNet Security Web Site provides additional information
about security in Microsoft products.
Disclaimer:
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.
Revisions:
* V1.0 (June 12, 2002): Bulletin Created.
[***** End Microsoft Security Bulletin MS02-030 *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Microsoft Corporation for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
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This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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