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Credit:
The information has been provided by wushi.
The original article can be found at: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=864
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Vulnerable Systems:
* Microsoft Internet Explorer version 6
Immune Systems:
* Microsoft Internet Explorer 7
* Microsoft Internet Explorer 8
The vulnerability occurs when an HTML object with an 'onreadystatechange' event handler is not properly freed. This event is used to perform actions when the state of some HTML object changes; for example, when a form has data input. Specifically, when certain properties of the object are changed, the event handler function object is freed, but a reference to it remains. When the object is later accessed, this invalid memory is treated as an object pointer, and one of its members is used to make an indirect function call. This results in the execution of arbitrary code.
Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the web page. To exploit this vulnerability, a targeted user must load a malicious webpage created by an attacker. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. After the user visits the malicious web page, no further user interaction is needed.
Patch Availability:
Microsoft Corp. has released a patch which addresses this issue. Information about downloadable vendor updates can be found by clicking on the following URL: http://www.microsoft.com/technet/security/bulletin/ms10-018.mspx
CVE Information:
CVE-2010-0491
Disclosure Timeline:
07/21/2009 Initial Vendor Notification
07/21/2009 Initial Vendor Reply
03/30/2010 Coordinated Public Disclosure
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