Описание
Microsoft Excel Remote Code Execution Vulnerability
A remote code execution vulnerability exists in Microsoft Excel software when the software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. 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.
Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Excel. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) containing a specially crafted file designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or instant message, and then convince them to open the specially crafted file.
The security update addresses the vulnerability by correcting how Microsoft Excel handles objects in memory.
Обходное решение
Use Microsoft Office File Block policy to prevent Office from opening Office 2003 (Excel binary files) and earlier documents from unknown or untrusted sources and locations Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
For Office 2007
- Run** regedit.exe** as Administrator and navigate to the following sub key:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]
- Set the BinaryFiles DWORD value to 1. Note To use 'FileOpenBlock' with Office 2007, all of the latest Office 2007 security updates as of May 2007 must be applied.
Impact of Workaround.. Users who have configured the File Block policy and have not configured a special “exempt directory” as discussed in Microsoft Knowledge Base Article 922849 will be unable to open documents saved in the Office 2003 or older file formats.
How to undo the workaround.
**For Office 2007 **
- Run regedit.exe as Administrator and navigate to the following subkey:
[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.0\Excel\Security\FileOpenBlock]
- Set the BinaryFiles DWORD value to 0.
FAQ
I am being offered this update for software that is not specifically indicated as being affected in the Affected Software and Vulnerability Severity Ratings table. Why am I being offered this update?
When updates address vulnerable code that exists in a component that is shared between multiple Microsoft Office products or shared between multiple versions of the same Microsoft Office product, the update is considered to be applicable to all supported products and versions that contain the vulnerable component.
For example, when an update applies to Microsoft Office 2007 products, only Microsoft Office 2007 may be specifically listed in the Affected Software table. However, the update could apply to Microsoft Word 2007, Microsoft Excel 2007, Microsoft Visio 2007, Microsoft Compatibility Pack, Microsoft Excel Viewer, or any other Microsoft Office 2007 product that is not specifically listed in the Affected Software table. Furthermore, when an update applies to Microsoft Office 2010 products, only Microsoft Office 2010 may be specifically listed in the Affected Software table. However, the update could apply to Microsoft Word 2010, Microsoft Excel 2010, Microsoft Visio 2010, Microsoft Visio Viewer, or any other Microsoft Office 2010 product that is not specifically listed in the Affected Software table.
For more information on this behavior and recommended actions, see Microsoft Knowledge Base Article 830335. For a list of Microsoft Office products that an update may apply to, refer to the Microsoft Knowledge Base Article associated with the specific update.
Обновления
| Продукт | Статья | Обновление |
|---|---|---|
| Microsoft Office Compatibility Pack Service Pack 3 | ||
| Microsoft Excel 2007 Service Pack 3 | ||
| Microsoft Excel 2010 Service Pack 2 (32-bit editions) | ||
| Microsoft Excel 2010 Service Pack 2 (64-bit editions) | ||
| Excel Services on Microsoft SharePoint Server 2007 Service Pack 3 (32-bit editions) | ||
| Excel Services on Microsoft SharePoint Server 2007 Service Pack 3 (64-bit editions) | ||
| Excel Services on Microsoft Sharepoint Server 2010 Service Pack 2 Bad |
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Возможность эксплуатации
Publicly Disclosed
Exploited
Latest Software Release
Older Software Release
EPSS
Связанные уязвимости
Microsoft Excel 2007 SP3, Excel 2010 SP2, Office Compatibility Pack SP3, Excel Services on SharePoint Server 2007 SP3, and Excel Services on SharePoint Server 2010 SP2 allow remote attackers to execute arbitrary code via a crafted Office document, aka "Microsoft Office Memory Corruption Vulnerability."
Microsoft Excel 2007 SP3, Excel 2010 SP2, Office Compatibility Pack SP3, Excel Services on SharePoint Server 2007 SP3, and Excel Services on SharePoint Server 2010 SP2 allow remote attackers to execute arbitrary code via a crafted Office document, aka "Microsoft Office Memory Corruption Vulnerability."
Уязвимость пакета обеспечения совместимости Microsoft Office Compatibility Pack, редактора электронных таблиц Microsoft Excel, программного обеспечения для электронного документооборота Microsoft SharePoint Foundation, HTML-редактора Microsoft SharePoint Designer, позволяющая нарушителю выполнить произвольный код
EPSS