Vulnerability Note VU#493881
Microsoft Internet Explorer data binding memory corruption vulnerability
Microsoft Internet Explorer contains an invalid pointer vulnerability in its data binding code, which can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
Microsoft Internet Explorer contains an invalid pointer vulnerability in its data binding code. The vulnerability can be triggered when Internet Explorer or a program that uses Internet Explorer's components renders a document that contains more than one reference to the same data source. This flaw can cause an invalid array size and result in the accessing of memory space of a deleted object. Specially crafted content that performs data binding, such as an XML or HTML document, can cause IE to crash in a way that is exploitable. Limited testing has shown this vulnerability to affect Internet Explorer 6 and later, up to and including Internet Explorer 8 Beta 2. However, all versions of Internet Explorer from 4.0 and on may be at risk. We have confirmed that Outlook Express is also at risk. Exploit code for this vulnerability is publicly available.
By convincing a user to view a specially crafted document that performs data binding (e.g., a web page or email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user.
Apply an update
This issue is addressed in Microsoft Security Bulletin MS08-078. This update provides new versions of mshtml.dll and wmshtml.dll, depending on the target operating system. More details are available in Microsoft Knowledge Base Article 960714. Consider the following workarounds if you are unable to apply the update:
Disable Active Scripting
This vulnerability can be mitigated by disabling Active Scripting in the Internet Zone, as specified in the "Securing Your Web Browser" document. Note that this will not block the vulnerability. IE still may crash when parsing specially crafted XML content. Disabling Active Scripting will mitigate a common method used to achieve code execution with this vulnerability.
Enable DEP in Internet Explorer 7
Enabling DEP in Internet Explorer 7 on Windows Vista can help mitigate this vulnerability by making it more difficult to achieve code execution using this vulnerability.
Systems Affected (Learn More)
|Vendor||Status||Date Notified||Date Updated|
|Microsoft Corporation||Affected||09 Dec 2008||17 Dec 2008|
CVSS Metrics (Learn More)
This document was written by Will Dormann.
- CVE IDs: CVE-2008-4844
- Date Public: 09 Dec 2008
- Date First Published: 10 Dec 2008
- Date Last Updated: 18 Dec 2008
- Severity Metric: 72.14
- Document Revision: 59
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