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Title: WebDAV Service Provider Can Allow Scripts to Levy
Requests as User
Date: 18 April 2001
Software: Microsoft Data Access Component Internet Publishing
Provider
Impact: Web-based script could levy WebDAV requests on the user's
behalf.
Bulletin: MS01-022
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-022.asp.
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Issue:
======
The Microsoft Data Access Component Internet Publishing Provider
provides access to WebDAV resources over the Internet. By design, it
should differentiate between requests made by a user and those made
by
a script running in the user's browser. However, because of an
implementation flaw, it handles all requests in the security context
of
the user. As a result, if a user browsed to a web page or opened an
HTML e-mail that contained script, that script could access web-based
resources as the user.
The specific actions an attacker could take via this vulnerability
would depend on the Web-based resources available to the user, and
the
user's privileges on them. However, it is likely that at a minimum,
the
attacker could browse the user's intranet, and potentially access
web-based e-mail as well.
Mitigating Factors:
====================
- The attacker would need to possess significant inside information
in
order to carry out a successful attack, such as server names,
folder
structures, and other user- and network-specific information. This
vulnerability would therefore be most likely used as part of an
insider attack.
- The vulnerability could not be exploited against stand-alone
machines.
- The vulnerability could not be exploited if Active Scripting was
disabled in the Security Zone the script opened in.
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
Security Bulletin
http://www.microsoft.com/technet/security/bulletin/ms01-022.asp
for information on obtaining this patch.
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MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES
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APPLY.
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This archive was generated by hypermail 2b30 : Wed Apr 18 2001 - 21:59:24 PDT