Microsoft SQL Server SQLXML Buffer Overflow Vulnerability

BID:5004

Info

Microsoft SQL Server SQLXML Buffer Overflow Vulnerability

Bugtraq ID: 5004
Class: Boundary Condition Error
CVE:
Remote: Yes
Local: No
Published: Jun 12 2002 12:00AM
Updated: Jun 12 2002 12:00AM
Credit: Credited to Matt Moore of Westpoint Ltd.
Vulnerable: Microsoft SQL Server 2000 SP2
Microsoft SQL Server 2000 SP1
- Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional
- Microsoft Windows NT 4.0 SP6a
 - Microsoft Windows NT 4.0 SP6
 - Microsoft Windows NT 4.0 SP5
 Microsoft SQL Server 2000
- Microsoft Windows 2000 Professional SP2
 - Microsoft Windows 2000 Professional SP1
 - Microsoft Windows 2000 Professional
- Microsoft Windows NT 4.0 SP6a
 - Microsoft Windows NT 4.0 SP6
 - Microsoft Windows NT 4.0 SP5
 - Microsoft Windows NT 4.0
Not Vulnerable:

Discussion

Microsoft SQL Server SQLXML Buffer Overflow Vulnerability

SQLXML is a component of SQL Server 2000, which enables SQL servers to receive and send database queries via XML (Extensible Markup Language) format. Such queries can be sent using various methods of communication, one of which is via HTTP. SQLXML HTTP components reside in a virtual directory on a web server and are not enabled by default, SQLXML ISAPI extensions run with LocalSystem privileges.

A buffer overflow issue has been discovered in the SQLXML ISAPI extension that handles data queries over HTTP(SQLXML HTTP).

It is possible for a user to initiate the overflow by connecting to a host and submitting malformed data.

This issue has been reported to exist in SQL Server 2000 Gold, other versions may be vulnerable as well.

Exploit / POC

Microsoft SQL Server SQLXML Buffer Overflow Vulnerability

The following proof of concept was provided by Matt Moore <[email protected]>:

IIS-Server/Nwind/Template/catalog.xml?contenttype=text/AAAA...AAA

This uses a 'template' file instead of a direct query to cause inetinfo.exe to crash.

Solution / Fix

Microsoft SQL Server SQLXML Buffer Overflow Vulnerability

Solution:
Microsoft has released the following patches which rectify this issue:


Microsoft SQL Server 2000

Microsoft SQL Server 2000 SP1

Microsoft SQL Server 2000 SP2

References

Microsoft SQL Server SQLXML Buffer Overflow Vulnerability

References:

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