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Credit:
The information has been provided by Microsoft Security.
The original article can be found at: http://www.microsoft.com/technet/security/Bulletin/MS06-026.mspx
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Vulnerable Systems:
* Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and Microsoft Windows Millennium Edition (Me) See FAQ Related to This Security Update documented below.
Immune Systems:
* Microsoft Windows 2000 Service Pack 4
* Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2
* Microsoft Windows XP Professional x64 Edition
* Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1
* Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 for Itanium-based Systems
* Microsoft Windows Server 2003 x64 Edition
Graphics Rendering Vulnerability - CVE-2006-2376
A remote code execution vulnerability exists in the Graphics Rendering Engine because of the way that it handles Windows Metafile (WMF) images. An attacker could exploit the vulnerability by constructing a specially crafted WMF image that could potentially allow remote code execution if a user visited a malicious Web site or opened a specially crafted attachment in e-mail. An attacker who successfully exploited this vulnerability could take complete control of an affected system.
Mitigating Factors for Graphics Rendering Vulnerability - CVE-2006-2376:
In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. Also, Web sites that accept or host user-provided content or advertisements, and compromised Web sites, may contain malicious content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail or Instant Messenger request that takes users to the attacker's Web site.
Workarounds for Graphics Rendering Vulnerability - CVE-2006-2376:
We have not identified any workarounds for this vulnerability.
FAQ for Graphics Rendering Vulnerability - CVE-2006-2376:
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could remotely take complete control of an affected system. An attacker could then install programs; view, change, or delete data.
What causes the vulnerability?
A vulnerability exists in the way that the Graphics Rendering Engine handles specially crafted WMF images that could allow arbitrary code to be executed.
What is the Windows Metafile (WMF) image format?
A Windows Metafile (WMF) image is a 16-bit metafile format that can contain both vector information and bitmap information. It is optimized for the Windows operating system.
For more information about image types and formats, see Microsoft Knowledge Base Article 320314 or visit the MSDN Library Web site.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could take complete control of the affected system.
How could an attacker exploit the vulnerability?
An attacker could exploit this vulnerability by creating a malicious Web page or a specially crafted attachment in e-mail and then persuading the user to visit the page or open the attachment. If the user visited the page or opened the attachment, the attacker could cause malicious code to run in the security context of the locally logged on user. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.
What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user is reading e-mail or visiting Web sites for any malicious action to occur. Therefore, any systems where e-mail is read or where Internet Explorer is used frequently are at the most risk from this vulnerability.
Does this vulnerability affect image formats other than Windows Metafile (WMF)?
The only image format that is affected is the Windows Metafile (WMF) format. It is possible, however, that an attacker could rename the file name extension of a WMF file to that of a different image format. In this situation, it is likely that the Graphics Rendering Engine would detect and render the file as a WMF image, which could allow exploitation.
If I block files that use the .wmf file name extension, can this protect me against attempts to exploit this vulnerability?
No. The Graphics Rendering Engine does not determine file types by the file name extensions that they use. Therefore, if an attacker alters the file name extension of a WMF file, the Graphics Rendering Engine could still render the file in a way that could exploit the vulnerability.
Are Windows 2000, Windows XP or Windows Server 2003 affected by this vulnerability?
No. Windows 2000, Windows XP, and Windows Server 2003 do not contain the affected component.
Could the vulnerability be exploited over the Internet?
An attacker could try to exploit this vulnerability over the Internet. Firewall best practices and standard default firewall configurations can help protect against attacks that originate from the Internet. Microsoft has provided information about how you can help protect your PC. End users can visit the Protect Your PC Web site. IT professionals can visit the Security Guidance Center Web site.
What does the update do?
The update removes the vulnerability by modifying the way that Windows Metafile (WMF) images are handled.
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.
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.
How does this vulnerability relate to the vulnerabilities that were corrected by MS06-001?
Both vulnerabilities were in the Graphics Rendering Engine. However, this update addresses a new vulnerability that was not addressed as part of MS06-001. MS06-001 does not help protect against the vulnerability that is discussed in this bulletin, and does not address this new vulnerability.
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