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Title: Buffer Overrun in WordPerfect Converter Could Allow
Code Execution (827103)
Date: 03 September 2003
Software: Microsoft Office 97
Microsoft Office 2000
Microsoft Office XP
Microsoft Word 98 (J)
Microsoft FrontPage 2000
Microsoft FrontPage 2002
Microsoft Publisher 2000
Microsoft Publisher 2002
Microsoft Works Suite 2001
Microsoft Works Suite 2002
Microsoft Works Suite 2003
Impact: Run code of attacker's choice
Max Risk: Important
Bulletin: MS03-036

Microsoft encourages customers to review the Security Bulletins
at:
http://www.microsoft.com/technet/security/bulletin/MS03-036.asp
http://www.microsoft.com/security/security_bulletins/ms03-036.asp

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Issue:

Microsoft Office provides a number of converters that allow users
to import and edit files that use formats that are not native to
Office. These converters are available as part of the default
installation of Office and are also available separately in the
Microsoft Office Converter Pack. These converters can be useful
to organizations that use Office in a mixed environment with
earlier versions of Office and other applications, including
Office for the Macintosh and third-party productivity
applications.

There is a flaw in the way that the Microsoft WordPerfect
converter handles Corel(r) WordPerfect documents. A security
vulnerability results because the converter does not correctly
validate certain parameters when it opens a WordPerfect document,
which results in an unchecked buffer. As a result, an attacker
could craft a malicious WordPerfect document that could allow
code of their choice to be executed if an application that used
the WordPerfect converter opened the document. Microsoft Word and
Microsoft PowerPoint (which are part of the Office suite),
FrontPage (which is available as part of the Office suite or
separately), Publisher, and Microsoft Works Suite can all use the
Microsoft Office WordPerfect converter.

The vulnerability could only be exploited by an attacker who
persuaded a user to open a malicious WordPerfect document-there
is no way for an attacker to force a malicious document to be
opened or to trigger an attack automatically by sending an e-mail
message.

Mitigating Factors:

• -The user must open the malicious document for an attacker to be
  successful. An attacker cannot force the document to be opened
  automatically.
• -The vulnerability cannot be exploited automatically through e-
  mail. A user must open an attachment that is sent in an e-mail
  message for an e-mail-borne attack to be successful.

Risk Rating:

• Important

Patch Availability:

• A patch is available to fix this vulnerability. Please read
  the Security Bulletins at
  http://www.microsoft.com/technet/security/bulletin/ms03-036.asp
  http://www.microsoft.com/security/security_bulletins/ms03-036.asp
  for information on obtaining this patch.

Acknowledgment:

• eEye Digital Security, http://www.eeye.com

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