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Related information

  Очередная ошибка с обнаружением макросов в документах Office (protection bypass)

  Symantec Security Response SecBul-10042001, Revision1, Malformed Microsoft Excel or PowerPoint documents bypass Microsoft macro security features

From:MICROSOFT <secure_(at)_microsoft.com>
Date:05.10.2001
Subject:Security Bulletin MS01-050


- ----------------------------------------------------------------------
Title:      Malformed Excel or PowerPoint Document Can Bypass Macro
           Security
Date:       04 October 2001
Software:   Microsoft Excel or PowerPoint for Windows or Macintosh
Impact:     Run Code Of Attacker's Choice
Bulletin:   MS01-050

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-050.asp.
- ----------------------------------------------------------------------

Issue:
======
Excel and PowerPoint have a macro security framework that controls
the execution of macros and prevents macros from running
automatically. Under this framework, any time a user opens a
document the document is scanned for the presence of macros.
If a document contains macros, the user is notified and asked
if he wants to run the macros or the macros are disabled entirely,
depending on the security setting. A flaw exists in the way macros
are detected that can allow a malicious user to bypass macro
checking.

A malicious attacker could attempt to exploit this vulnerability
by crafting a specially formed Excel or PowerPoint document with
macro code that would run automatically when the user opened it.
The attacker could carry out this attack by hosting the malicious
file on a web site, a file share, or by sending it through email.

Mitigating Factors:
====================
- The macro code could not execute without the user's
  first opening the document.

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
  Security Bulletin at
  http://www.microsoft.com/technet/security/bulletin/ms01-050.asp
  for information on obtaining this patch.

Acknowledgment:
===============
- Peter Ferrie, Symantec Security Response
  (http://securityresponse.symantec.com)

- ---------------------------------------------------------------------

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