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Title: Flaw in Windows XP Help and Support Center Could Enable
File Deletion (Q328940)
Date: 16 October 2002
Software: Microsoft Windows XP
Impact: Delete files on the user's system
Max Risk: Moderate
Bulletin: MS02-060
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-060.asp.
Help and Support Center provides a centralized facility through which
users can obtain assistance on a variety of topics. For instance, it
provides product documentation, assistance in determining hardware
compatibility, access to Windows Update, online help from Microsoft,
and other assistance.
A security vulnerability is present in the Windows XP version of Help
and Support Center, and results because a file intended only for use
by the system is instead available for use by any web page. The
purpose of the file is to enable anonymous upload of hardware
information, with the user's permission, so that Microsoft can
evaluate which devices users are not currently finding device drivers
for. This information is then used to work with hardware vendors and
device teams to improve the quality and quantity of drivers available
in Windows. By design, after attempting to upload an XML file
containing the hardware information, the system deletes it.
An attacker could exploit the vulnerability by constructing a web
page that, when opened, would call the errant function and supply the
name of an existing file or folder as the argument. The attempt to
upload the file or folder would fail, but the file nevertheless would
be deleted. The page could be hosted on a web site in order to attack
users visiting the site, or could be sent as an HTML mail in order to
attack the recipient when it was opened.
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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