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Credit:
The information has been provided by Microsoft Security Bulletin MS07-025.
The original article can be found at:
http://www.microsoft.com/technet/security/bulletin/ms07-025.mspx
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Affected Software:
* Microsoft Office 2000 Service Pack 3 - Download the update (KB934526)
* Microsoft Excel 2000
* Microsoft FrontPage 2000
* Microsoft Publisher 2000
* Microsoft Office XP Service Pack 3 - Download the update (KB934705)
* Microsoft Excel 2002
* Microsoft FrontPage 2002
* Microsoft Publisher 2002
* Microsoft Office 2003 Service Pack 2 - Download the update (KB934180)
* Microsoft Excel 2003
* Microsoft FrontPage 2003
* Microsoft Publisher 2003
* Microsoft Excel 2003 Viewer
* 2007 Microsoft Office System - Download the update (KB934062)
* Microsoft Office Excel 2007
* Microsoft Office Publisher 2007
* Microsoft Office SharePoint Designer 2007
* Microsoft Expression Web
* Microsoft Office 2004 for Mac - Download the update (KB936749)
Non-Affected Software:
* Microsoft Works Suites:
* Microsoft Works Suite 2004
* Microsoft Works Suite 2005
* Microsoft Works Suite 2006
* Microsoft Office 2000 Service Pack 3
* Microsoft Access 2000
* Microsoft Outlook 2000
* Microsoft PowerPoint 2000
* Microsoft Project 2000 Service Release 1
* Microsoft Word 2000
* Microsoft Office XP Service Pack 3
* Microsoft Access 2002
* Microsoft Outlook 2002
* Microsoft PowerPoint 2002
* Microsoft Project 2002 Service Pack 1
* Microsoft Visio 2002
* Microsoft Word 2002
* Microsoft Office 2003 Service Pack 2:
* Microsoft Access 2003
* Microsoft InfoPath 2003
* Microsoft OneNote 2003
* Microsoft Outlook 2003
* Microsoft Project 2003
* Microsoft PowerPoint 2003
* Microsoft PowerPoint 2003 Viewer
* Microsoft Visio 2003
* Microsoft Word 2003
* Microsoft Word 2003 Viewer
* 2007 Microsoft Office System
* Microsoft Office Access 2007
* Microsoft Office PowerPoint 2007
* Microsoft Office Project 2007
* Microsoft Office Visio 2007
* Microsoft Office Word 2007
Drawing Object Vulnerability - CVE-2007-1747:
A remote code execution vulnerability exists in the way Microsoft Office handles a specially crafted drawing object. An attacker could exploit this vulnerability when Office parses a file and processes a malformed drawing object. Such a specially crafted file might be included as an e-mail attachment or hosted on a malicious Web site. An attacker could exploit the vulnerability by constructing a specially crafted Office file containing a malformed drawing object that could allow remote code execution.
Mitigating Factors for Drawing Object Vulnerability - CVE-2007-1747:
* An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
* In a Web-based attack scenario, an attacker would have to host a Web site that contains an Office file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to persuade them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site.
* The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful a user must open an attachment that is sent in an e-mail message.
* Users who have installed and are using the Office Document Open Confirmation Tool for Office 2000 will be prompted with Open, Save, or Cancel before opening a document. The features of the Office Document Open Confirmation Tool are incorporated in Office XP and Office 2003.
Workarounds for Drawing Object Vulnerability - CVE-2007-1747:
* Use Microsoft Word Viewer 2003 to open and view files. The Microsoft Word Viewer 2003 is not affected by the issue. Users can download Microsoft Word Viewer 2003 from the Microsoft Download Center.
* Do not open or save Microsoft Office files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
FAQ for Drawing Object Vulnerability - CVE-2007-1747:
What is the scope of the vulnerability?
A remote code execution vulnerability exists in the way Microsoft Office handles a specially crafted drawing object. An attacker could exploit this vulnerability by getting a user into opening a specially crafted file containing a malicious drawing object. Such a specially crafted file might be included as an e-mail attachment or hosted on a malicious Web site. Opening a specially crafted file could allow remote code execution in the security context of the logged on user.
If the user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate with administrative user rights.
What causes the vulnerability?
Office does not perform sufficient data validation when parsing Office drawing objects. When Office opens a specially crafted Office file and parses a malformed drawing object, it may corrupt memory in such a way that an attacker could execute arbitrary code.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code on a user s system. This could allow an attacker to take complete control of the affected system.
How could an attacker exploit the vulnerability?
In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially-crafted file to the user and by convincing the user to open the file.
In a Web-based attack scenario, an attacker would have to host a Web site that contains a Office file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to persuade them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.
I don t have any of the affected software installed on my system but I do have MSO.dll on my system and I am getting offered the security update, why?
MSO.dll is a file shared between Office applications; only customers having an Office application called out as affected are at risk from this vulnerability. Since the file is on the system even if you don t have an affected Office application installed Microsoft recommends that you install the security update.
What does the update do?
The update removes the vulnerability by modifying the way that Microsoft Office handles certain drawing objects.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure. Microsoft had not received any information to indicate that this vulnerability had been publicly disclosed when this security bulletin was originally issued. This security bulletin addresses the privately disclosed vulnerability as well as additional issues discovered through internal investigations.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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