Alert: Microsoft Security Bulletin - MS03-007

From: Russ (Russ.Cooper@RC.ON.CA)
Date: 03/17/03

  • Next message: M. Burnett: "Re: Alert: Microsoft Security Bulletin - MS03-007" 
    Date:         Mon, 17 Mar 2003 13:20:21 -0500
From: Russ <Russ.Cooper@RC.ON.CA>
To: NTBUGTRAQ@LISTSERV.NTBUGTRAQ.COM

    http://www.microsoft.com/technet/security/bulletin/MS03-007.asp

    Unchecked buffer in Windows component could cause web server compromise (815021)

    Originally posted: March 17, 2003

    Summary

    Who should read this bulletin: Systems administrators running Microsoft ® Windows ® 2000

    Impact of vulnerability: Run code of attacker's choice

    Maximum Severity Rating: Critical

    Recommendation: Systems administrators should apply the patch immediately

    Affected Software:
    - Microsoft Windows 2000

    Technical description:

    Microsoft Windows 2000 supports the World Wide Web Distributed Authoring and Versioning (WebDAV) protocol. WebDAV, defined in RFC 2518, is a set of extensions to the Hyper Text Transfer Protocol (HTTP) that provide a standard for editing and file management between computers on the Internet. A security vulnerability is present in a Windows component used by WebDAV, and results because the component contains an unchecked buffer.

    An attacker could exploit the vulnerability by sending a specially formed HTTP request to a machine running Internet Information Server (IIS). The request could cause the server to fail or to execute code of the attacker's choice. The code would run in the security context of the IIS service (which, by default, runs in the LocalSystem context).

    Although Microsoft has supplied a patch for this vulnerability and recommends customers install the patch immediately, additional tools and preventive measures have been provided that customers can use to block the exploitation of this vulnerability while they are assessing the impact and compatibility of the patch. These temporary workarounds and tools are discussed in the "Workarounds" section in the FAQ below.

    Mitigating factors:
    - URLScan, which is a part of the IIS Lockdown Tool will block this attack in its default configurations
    - The vulnerability can only be exploited remotely if an attacker can establish a web session with an affected server

    Vulnerability identifier: CAN-2003-0109

    This email is sent to NTBugtraq automatically as a service to my subscribers. (v1.18)

    Cheers,
    Russ - Surgeon General of TruSecure Corporation/NTBugtraq Editor

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