TUCoPS :: Windows Apps :: m-051.txt

Microsoft XMLHTTP Control Vulnerability (CIAC M-051)

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                       The U.S. Department of Energy
                     Computer Incident Advisory Center
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                             INFORMATION BULLETIN

                    Microsoft XMLHTTP Control Vulnerability
                     [Microsoft Security Bulletin MS02-008]

February 28, 2002 22:00 GMT                                       Number M-051
______________________________________________________________________________
PROBLEM:       A flaw exists in how the XMLHTTP control applies IE security 
               zone settings to a redirected data stream returned in response 
               to a request for data from a web site. 
PLATFORM:      Microsoft XML Core Services versions 2.6, 3.0, and 4.0
               An affected version of Microsoft XML Core Services also ships as 
               part of the following products: 
               Microsoft Windows XP 
               Microsoft Internet Explorer 6.0 
               Microsoft SQL Server 2000 
DAMAGE:        An attacker could exploit this vulnerability by specifying a 
               data source on the user’s local system. The attacker could then 
               use this to return information from the local system to the 
               attacker’s web site. 
SOLUTION:      Apply available patch. 
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. This vulnerability does not give an 
ASSESSMENT:    attacker any ability to add, change or delete data. 
______________________________________________________________________________
LINKS: 
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/m-051.shtml 
 ORIGINAL BULLETIN:                                                           
                     http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS02-008.asp 
 PATCHES:                                                                     
                     http://www.microsoft.com/windows/ie/downloads/critical/q317244/download.asp 
                     http://www.microsoft.com/Windowsupdate 
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[***** Start Microsoft Security Bulletin MS02-008 *****]

Microsoft Security Bulletin MS02-008  

XMLHTTP Control Can Allow Access to Local Files

Originally posted: February 21, 2002

Summary

Who should read this bulletin: Customers using Microsoft® XML Core 
Services 2.6 and later. This includes customers using Microsoft 
Windows® XP, SQL Server™ 2000, and Internet Explorer 6.0. 

Impact of vulnerability: Information disclosure 

Maximum Severity Rating: Critical 

Recommendation: Customers and system administrators should apply the 
patch to all affected machines immediately. 

Affected Software: 

Microsoft XML Core Services versions 2.6, 3.0, and 4.0 
An affected version of Microsoft XML Core Services also ships as part of the 
following products: 
Microsoft Windows XP 
Microsoft Internet Explorer 6.0 
Microsoft SQL Server 2000 

Technical description: 

Microsoft XML Core Services (MSXML) includes the XMLHTTP ActiveX control, 
which allows web pages rendering in the browser to send or receive XML 
data via HTTP operations such as POST, GET, and PUT. The control provides 
security measures designed to restrict web pages so they can only use 
the control to request data from remote data sources. 

A flaw exists in how the XMLHTTP control applies IE security zone settings 
to a redirected data stream returned in response to a request for data 
from a web site. A vulnerability results because an attacker could seek 
to exploit this flaw and specify a data source that is on the user’s 
local system. The attacker could then use this to return information 
from the local system to the attacker’s web site. 

An attacker would have to entice the user to a site under his control 
to exploit this vulnerability. It cannot be exploited by HTML email. 
In addition, the attacker would have to know the full path and file 
name of any file he would attempt to read. Finally, this vulnerability 
does not give an attacker any ability to add, change or delete data. 

Mitigating factors: 

The vulnerability can only be exploited via a web site. It would not 
be possible to exploit this vulnerability via HTML mail.
 
The attacker would need to know the full path and file name of a file 
in order to read it.
 
The vulnerability does not provide any ability to add, change, or delete 
files. 

Severity Rating:  Internet Servers Intranet Servers Client Systems 
MSXML version 2.6 Moderate Moderate Critical 
MSXML version 3.0 Moderate Moderate Critical 
MSXML version 4.0 Moderate Moderate Critical 

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. This vulnerability 
affects the disclosure of personal information, and is most likely to 
have an impact on client systems. 

Vulnerability identifier: CAN-2002-0057 

Tested Versions:
Microsoft tested MSXML versions 2.0, 2.5, 2.6, 3.0, and 4.0. Previous 
versions are no longer supported, and may or may not be affected by 
these vulnerabilities.

Patch availability
Download locations for this patch 
Microsoft XML Core Services: 

http://www.microsoft.com/windows/ie/downloads/critical/q317244/download.asp 
http://www.microsoft.com/Windowsupdate 

Additional information about this patch

Installation platforms: 

MSXML versions 2.6 Gold, 3.0 Gold, 3.0 Service Pack 1, 3.0 Service 
Pack 2, or 4.0 Gold 

Inclusion in future service packs:

MSXML, 3.0 SP3 and 4.0 Service Pack 1 
Microsoft Windows 2000 Service Pack 3 
Microsoft Windows XP Service Pack 1 
Microsoft Internet Explorer 6.0 Service Pack 1 
Microsoft SQL Server 2000 Service Pack 3 

Reboot needed: Yes 

Superseded patches: None. 

Verifying patch installation: 

To verify that the patch has been installed on the machine, confirm 
that the following registry keys have been created on the machine:
 
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\DataAccess\Q318202 (for MSXML 2.0) 
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\DataAccess\Q318203 (for MSXML 3.0) 
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\MSXML4\Q317244 (for MSXML 4.0) 

Caveats:
None 

Localization:
This patch can be installed on all languages. 

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 
Support: 

Microsoft Knowledge Base articles Q318202 (for MSXML 2.0), Q318203 
(for MSXML 3.0), and Q317244 (for MSXML 4.0) discuss 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 (February 21, 2002): Bulletin Created. 
V1.1 (February 27, 2002): Bulletin updated with corrected patch verification 
information and Knowledge Base articles. 

[***** End Microsoft Security Bulletin MS02-008 *****]

_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft Corporation for the 
information contained in this bulletin.
_______________________________________________________________________________


CIAC, the Computer Incident Advisory Center, 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
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This document was prepared as an account of work sponsored by an
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Government nor the University of California nor any of their
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