__________________________________________________________
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
______________________________________________________________________________
[***** 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
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193 (7x24)
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@ciac.org
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
Anonymous FTP: ftp.ciac.org
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
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
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
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