iDefense Security Advisory 12.11.07
Dec 11, 2007
Internet Explorer is a graphical web browser developed by Microsoft
Corp. and included as part of Microsoft Windows since 1995. The
to a CSS or DHTML object within a web page. For more information, visit
the following URLs.
Remote exploitation of a heap corruption vulnerability in Microsoft
Corp.'s Internet Explorer web browser allows attackers to execute
arbitrary code in the context of the current user.
implemented in mshtml.dll. When malformed parameters are supplied,
memory can be corrupted in a way that results in Internet Explorer
accessing a previously deleted object. By creating a specially crafted
web page, it is possible for an attacker to control the contents of the
memory pointed to by the released object. This allows an attacker to
execute arbitrary code.
Exploitation of this vulnerability would allow an attacker to execute
arbitrary code in the context of the user running Internet Explorer.
In order to exploit this vulnerability, an attacker must persuade a user
to render a malicious web page using Internet Explorer. This is usually
accomplished by providing a link to the malicious page in an e-mail or
On Windows Vista, Internet Explorer 7 runs in "Protected Mode". Since
"Protected Mode" processes web pages with lower privileges than a
normal user, it lessens the impact of this vulnerability. However, it
does not prevent arbitrary code execution on the affected system.
As of April 5th, 2007, iDefense testing shows that Internet Explorer 6.0
and Internet Explorer 7.0 with all available security patches are
vulnerable. Older versions of Internet Explorer may also be vulnerable.
issue. Applying this workaround will prevent proper rendering of web
VI. VENDOR RESPONSE
Microsoft has addressed this vulnerability within Microsoft Security
Bulletin MS07-069. For more information, consult their bulletin at the
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-3902 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
05/08/2007 Initial vendor notification
05/08/2007 Initial vendor response
12/11/2007 Coordinated public disclosure
This vulnerability was reported to iDefense by Peter Vreugdenhil
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X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
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