iDefense Security Advisory 08.11.09: Microsoft Office Web Components 2000 Buffer Overflow Vulnerability
iDefense Security Advisory 08.11.09
Aug 11, 2009
Office Web Components is a group of ActiveX controls that can be used to
view and edit Microsoft Office files such as spreadsheets and charts. It
is commonly used to allow a user to edit a spreadsheet in the browser.
The controls are installed with a default installation of Microsoft
Office. More information can be found at the vendors website at the
Remote exploitation of a stack based buffer overflow vulnerability in
Microsoft Corp.s Office Web Components 2000 could allow an attacker to
execute arbitrary code with the privileges of the logged on user.
When instantiating a Spreadsheet object, it is possible to pass the
object a parameter that refers to an Excel file that will be retrieved
and then loaded. By using a long string for the parameter, it is
possible to case a stack based buffer overflow.
Exploitation results in the execution of arbitrary code with the
privileges of the logged-on user. Exploitation would require that an
attacker hosts a maliciously crafted page on a Web site and entice
users to visit the site. No further action is needed other than
following a link to a malicious Web page.
iDefense has confirmed the existence of this vulnerability in Microsoft
Office XP Service Pack 3. Microsoft reports that the following products
Microsoft Office XP Service Pack 3
Microsoft Office 2000 Web Components SP3
Microsoft Office XP Web Components SP3
Microsoft BizTalk Server 2002
Visual Studio .NET 2003 Service Pack 1
Setting the kill bit for the following CLSIDs will mitigate the threat
from web based attacks conducted through Internet Explorer. The CLSID
for the vulnerable control is:
VI. VENDOR RESPONSE
Microsoft has released a patch which addresses this issue. For more
information, consult their advisory at the following URL:
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2009-1534 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
03/17/2008 Initial vendor notification
03/17/2008 Initial vendor response
03/17/2008 PoC requested
03/17/2008 Poc sent
04/18/2008 Status update request sent
05/28/2008 Status update request sent
07/03/2008 Status update received, new case manager assigned
06/26/2009 Status update received, new case manager assigned
06/26/2009 Bulletin release scheduled for July
07/09/2009 Status update received, bulletin delayed
08/11/2009 Public disclosure by Microsoft
This vulnerability was discovered by Sean Larsson, iDefense Labs.
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X. LEGAL NOTICES
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